JP4479564B2 - Channel control method, program, and computer system during network system initialization - Google Patents

Description

The present invention relates to a large-scale information system, and in particular, when a network topology is changed, such as addition / deletion of a node device ( or channel) at the time of initialization of the large-scale information system, a state change notification for notifying this change is provided. Each node device can obtain the network connection configuration information by sending it to all registered node devices and inquiring the server that stores the network connection configuration information by each node device that has received this status change notification. Further, the present invention relates to a technique in which each node device processes a large number of state change notifications that occur at the time of simultaneous activation of the node devices constituting such a network.

  As a network related to a large-scale information system, for example, a network using Fiber Channel (abbreviated as “FC”) standardized by the ANSI (American National Standards Institute) X3T11 working group is well known. Fiber Channel is a high-speed full-duplex communication technology for computer / node communication.

  FIG. 7 shows a configuration of a fiber channel network (hereinafter referred to as “FC network”) as a normal information processing system (large-scale information system). 7, the FC network 200 as an information processing system (large-scale information system) includes a plurality of node devices 101, 102,... 10S, a plurality of disk devices (disks) 301, 302,. Each node device 101 to 10S and the disk devices 301 to 30M are configured to include an FC switch network (also referred to as “fabric”) 20 to which the fiber channels FC1 to FCn are connected. Each of the node devices 101 to 10S is a computer such as a PC (personal computer) or a server or a computer-based device. The node devices 101 to 10S constitute a computer network 100 such as a LAN (local network) and the Internet together with various network elements (not shown).

  Here, the FC switch network 20 may be a single FC switch or a network of a plurality of FC switches. When viewed from the FC switch network 20, the disk devices 301 to 30M are also nodes. Therefore, the FC switch network 20 enables communication between arbitrary nodes including the disk devices 301 to 30M. The FC switch network 20 includes an FC switch (name server) 22 that holds and manages a database of information related to nodes constituting the main part of the FC network 200.

  The FC network 200 illustrated in FIG. 7 is a so-called storage area network including disk devices 301 to 30M. In the storage area network, for example, a large number of disk devices are grouped so that each node recognizes only the disk devices of the group related to the node, thereby shortening the recognition time at the time of starting the node and Some have achieved avoidance (see Patent Document 1).

  In such an FC network 200, each of the nodes 101, 102,... 10S starts communication with other nodes in the following procedure.

  That is, each of the nodes 101 to 10S receives (1) dynamic allocation of a port address in advance (fabric login (referred to as FLOGI)), and (2) registers a supported service class or the like in the name server 22 (Port login (referred to as PLOGI)), and then (3) port login to the communication destination device. This establishes communication.

  In the FC network 200, when there is a change in the topology of the fabric, such as addition / deletion of the node devices 101 to 10S or the disk devices 301 to 30M, a state change notification (RSCN) is registered as described above ( FLOGI and PLOGI) are transmitted to all the node devices 101 to 10S and the disk devices 301 to 30m. Receiving this status change notification (RSCN), the node apparatuses 101 to 10S can inquire the name server 22 to obtain network connection configuration information and know which device has changed.

  Here, an operation at the time of initialization of the FC network 200 in FIG. 7 (conventional example) described above will be described. FIG. 8 shows the operation of each element and the flow of information when the node devices 101, 102,... 10S in the FC network 200 in this case are sequentially activated in this order.

In FIG. 8, first, when the fiber channel FC1 is connected to the FC network 200, a status change notification (RSCN) is sent to the M disk devices 301 to 30m. Next, when the fiber channel FC2 is connected to the FC network 200, the RSCN is transmitted to the M disk devices 301 to 30m and the fiber channel FC1 that are already connected to the FC switch network 20, and the FC2 is connected. To be notified. The FC 2 receives this RSCN and checks the connection configuration. However, since there is no change in the configuration of the connected device, the same information as the device information acquired at the time of initialization is acquired.

  The same processing is performed in the initialization of the next Fiber Channel FC3, and the RSCN is transmitted to the m disk devices 301 to 30m, FC1 and FC2 that are already connected to the FC switch network 20. In this way, when the S node devices 101 to 10S are sequentially activated, FC1 has an RSCN of “n−1”, FC2 has an RSCN of “n-2”,..., FCn is “0”. Each RSCN is received, and the connection configuration is confirmed by referring to the same number of name servers 22.

JP2003-241900 (paragraph 0006, FIG. 2)

  As described above, in the conventional example, as the number of fiber channels connected to the FC switch network 20 is larger, the confirmation processing of the connection configuration is concentrated on the name server 22 in the system initialization of the information processing system. For this reason, the burden on the FC switch has increased drastically, resulting in inconveniences such as delayed response.

  The present invention improves the inconvenience of the above-described conventional example, reduces the burden on the FC switch effectively in response to the concentration of state change notifications (RSCN) at the time of system initialization, and the entire apparatus. It is an object of the present invention to provide a channel control method at the time of network system initialization, a program thereof, and a computer system using the channel control method, which can eliminate the delay in response.

In order to achieve the above object, according to the present invention, when a large-scale information system composed of a plurality of node devices is initialized, a state change notification in the network topology corresponds to each channel device and connection from the network switch network. In the channel control method at the time of initialization of the network system configured such that each node device that is output to the device and receives this information introduces the connection configuration information to the server, When the state change notification output when the channel is connected to the network is received, the confirmation process is temporarily suspended, and the confirmation process is sequentially executed after the large-scale information system is initialized . In this case, the confirmation process performed after the initialization of the large-scale information system described above may be performed by performing the confirmation process of the connected device by receiving the state change notification by providing a time difference for each channel described above .

Further, in the present invention, when there is a change in the network topology, a status change notification related to the change is transmitted from the network switch network to all registered node devices, and each node device receives the status change notification. A network that makes a connection configuration information inquiry to a server that stores network connection configuration information in response to reception, wherein each node device is configured to initialize the plurality of node devices constituting the network at the time of system initialization. A method of controlling a channel to a network (hereinafter referred to as “the channel”) is provided. This channel control method at the time of network system initialization indicates whether or not the status change notification has been received without performing the corresponding connection configuration information inquiry when the status change notification is received during the system initialization. A flag management step for maintaining the reception flag in a set state, and a query step for inquiring connection configuration information when the reception flag is in the set state after the system initialization is completed ( Claim 1 ). In addition, the flag management step and the inquiry step include a step of referring to a boot flag indicating whether or not the system initialization is in progress. According to this method, unnecessary connection configuration information inquiry is avoided, so that the processing load on the server and the network switch network is reduced.

Furthermore, in the channel control method according to the present invention, the timer assigned to the channel is started when the flag management step described above is in the middle of the system initialization described above after performing the normal channel initialization. And a step of restarting the timer described above when a status change notification is received during system initialization, and the information inquiry step described above is such that the timer expires and the reception flag is set. actuated, characterized in that it comprises the step of querying the aforementioned connection configuration information when a state (claim 2). Even if it does in this way, the effect similar to the case of Claim 3 mentioned above will be acquired.

Here, it may be further comprising a step of setting a value greater than the time required for system initialization described above the set value of the timer mentioned above (claim 3). According to this method, it is possible to reduce processing associated with timer timeout, and to reduce the burden on the control unit of the node device.

In the channel control method according to the present invention, a step of setting a specific delay time for each channel, a port on the node device side of each channel or a port on the network switch network side of each channel; The method further includes the step of setting the set value of the timer to a value corresponding to the sum of the time required for system initialization and the delay time set for the channel ( claim 4 ). According to this method, since connection configuration information inquiry by each channel does not occur at the same time, it is possible to prevent flooding of access to the server and the network switch network.

Here, a step of setting a serial number to any of the above-described channels, a port on the node device side of each channel or a port on the network switch network side of each channel, and a system initialization of the set value of the timer It may be configured to further include a step of setting to a value corresponding to the sum of the time required for the channel and a value obtained by multiplying the serial number set or related to the channel by unit time ( Claim 5 ). According to this method, since the connection configuration information inquiry is performed at regular intervals, the connection configuration information inquiry by each channel does not occur at the same time, and the flooding of access to the server and the network switch network can be prevented.

Furthermore, in the channel control method of the present invention, the network switch network is composed of a single switch, and a unique delay time is set for each port on the side of the single switch to which each channel is connected, and the set value of the timer may be and a step of setting a value corresponding to sum of the time required for system initialization and the delay time set in the channel (claim 6). According to this method, even when the channel ID of each node device is the same, a delay time specific to each channel can be set.

The channel control method of the present invention described above, the channel is a Fiber Channel, the network is a Fiber Channel network, the network switch network is also applicable in the case of network FC switch (claim 7 ). That is, the channel control method of the present invention can be applied to a node device that can be connected to an FC network.

Here, in the channel control method according to the present invention, the flag management step and the inquiry step described above are configured to include a step of referring to a flag indicating whether or not the system initialization is in progress. also not good. Furthermore, the present invention provides a program of the steps described above with channel control method described above from the code sequence to be executed by the control unit of each node device (claim 8). By executing this program on the above-described node device, the same effects as described above can be obtained.

In addition, when the network topology is changed due to channel connection or the like, the computer system according to the present invention transmits a status change notification related to this change from the network switch network to all registered node devices. The node device is configured to be one of a number of nodes constituting the network that inquires connection configuration information to a server that stores the network connection configuration information in response to receiving the state change notification. Further, in this computer system, each node device initializes port means corresponding to each of at least one channel enabling communication with the above-described network and at least some of the nodes of the multiple nodes. Flag management means for maintaining a reception flag indicating whether or not a state change notification has been received without performing the connection configuration information inquiry when the state change notification is received during system initialization; and After the system initialization is completed, the system includes information inquiry means for inquiring connection configuration information when the above-described reception flag is in a set state ( claim 9 ). In addition, the flag management means and the information inquiry means have a flag reference function for referring to a boot flag indicating whether or not the system initialization is in progress.

Furthermore, when there is a change in the network topology due to channel connection or the like, the computer system according to the present invention transmits a status change notification related to the change from the network switch network to all registered node devices. The node device is configured to be one of many node devices constituting a network that makes a connection configuration information inquiry to a server that stores the network connection configuration information in response to receiving the state change notification. Further, when at least one status change notification is received through the channel during at least one channel enabling communication with the network described above, at least one channel after the system initialization is completed. An information inquiry means for inquiring connection configuration information once for each status change notification is included . According to this configuration, unnecessary connection configuration information query is avoided, so that the processing load on the server and the network switch network is reduced.

In addition, the computer system according to the present invention includes a start timing setting function for starting the timer assigned to the channel when the flag management means described above is in the middle of system initialization after performing normal channel initialization. , A restart timing setting function for restarting the timer when a state change notification is received during system initialization, and the inquiry means described above is in a state in which the timer expires and the reception flag is set In this case, the above-described inquiry timing setting function for inquiring the connection configuration information is provided ( claim 10 ). According to this configuration, the same effect as in the first aspect can be obtained.

Here, the set value of the timer mentioned above may be a value greater than the time required for system initialization (claim 11). According to this configuration, it is possible to reduce processing associated with timer timeout, and to reduce the burden on the control unit of the node device.

Furthermore, in the computer system according to the present invention, the flag management means of each node device is any one of the channel, the port means on the node side of each channel, or the port on the network switch network side of each channel. A delay time setting function for setting a unique delay time for each of the above and a delay for setting the set value of the timer to a value corresponding to the sum of the time required for system initialization and the delay time set for the channel It is good also as a structure containing a time totaling function ( Claim 12 ). According to this configuration, since connection configuration information inquiry by each channel does not occur at the same time, it is possible to prevent a flood of access to the server and the network switch network.

Further, in the computer system according to the present invention, the above-described flag management means of each node device is either a channel, a port on the node device side of each channel, or a port on the network switch network side of each channel. A value corresponding to the sum of the time required to initialize the system and the time required for system initialization and the value obtained by multiplying the serial number set or related to the serial number by a unit time while setting the serial number It is good also as a structure for the function set to ( Claim 13 ). According to this configuration, since the connection configuration information inquiry is performed at regular intervals, it is possible to prevent an inundation of access to the server and the network switch network without causing the connection configuration information inquiry by each channel simultaneously.

Here, the network switch network described above is composed of a single switch, and each node device sets a unique delay time for each port on the single switch to which each channel is connected. the set value of the timer may be configured to further include means for setting a value corresponding to the sum of the delay time set in the time and the channel required for system initialization described above (claim 14 ). According to this configuration, a delay time unique to each channel can be set even if the channel ID of each node device is the same.

The computer system according to the present invention is a channel Fiber Channel as described above, a network is a Fiber Channel network described above may also be a network switch network as described above is constituted by a network of fiber channel switch (according Item 15 ). As a result, the channel control method according to the present invention can be applied to a node device that can be connected to a fiber channel network.

The computer system described above is a flag management unit described above and query means, but it may also be configured with a flag reference function referring to the flag indicating whether or not during system initialization.

  According to the present invention, since the connection configuration confirmation operation for the RSCN output at the time of system initialization for initializing each node of the network is executed after the system initialization, the connection device confirmation is performed during the system initialization. This eliminates the need to execute the process, which can greatly reduce the load on the name server, and hence the FC switch. At the same time, since the connection configuration confirmation operation by each node does not occur simultaneously after the system initialization, it is possible to effectively avoid the concentration of access to the name server and the fiber channel switch network.

<< First Embodiment >>
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  The fiber channel network as the information processing system (large-scale information system) in the first embodiment is similar to the above-described fiber channel network (FC network: see FIG. 7), and includes a plurality of node devices (nodes) 10. And a plurality of disk devices (disks), and an FC switch network (also referred to as “fabric”) 20 to which each node device and the disk devices are connected via a fiber channel. Here, each node device 10 is a computer such as a PC (personal computer) or a server or a computer-based device. The node device 10 forms a computer network such as a LAN (local network) and the Internet together with various network elements (not shown) as in the case of FIG. 7 described above.

  FIG. 1 shows an example of the node device 10. The node device 10 functions as a part of the computer system. In this embodiment, in this embodiment, when there is a change in the network topology due to channel connection or the like, a state change notification related to the change is transmitted from the network switch network to all registered node devices, Each node device has a function that can be one of many node devices that inquire connection configuration information to a server that stores network connection configuration information in response to reception of the state change notification.

  The node device 10 operates when the above-described state change notification is received during the system initialization for initializing at least some of the node devices of a large number of node devices, and performs the above-described connection configuration information inquiry. The flag management means for keeping the flag indicating whether or not the status change notification has been received in the set state, and the above-described operation when the flag is in the set state after the system initialization is completed. An information inquiry means for inquiring connection configuration information is provided. For this reason, the flag management means and the information inquiry means function effectively, and unnecessary connection configuration information inquiry at the time of system initialization is avoided, so that the processing load on the server and the network and the work switch network is reduced. The high-speed processing operation of the FC network is effectively maintained.

  Further, the above-described flag management means of each node device 10 is activated when normal channel initialization is performed and when the system initialization is in progress, and the activation timing for starting the timer assigned to the channel is started. A setting function and a restart timing setting function that operates when the above-described state change notification is received during system initialization and restarts the timer are provided. The information inquiry means of the node device 10 is configured to have an inquiry timing setting function that operates when the timer expires and the aforementioned flag is set to inquire the aforementioned connection configuration information. Here, the flag management unit and the information inquiry unit of the node device 10 may be configured to have a flag reference function for referring to a flag indicating whether or not the system is being initialized.

  When each node device 10 receives a state change notification output when connecting to the network of each channel during initialization of a large-scale information system such as an FC network, the node device 10 temporarily performs the confirmation process. The system is suspended, and the confirmation process is sequentially executed after the large-scale information system is initialized. Further, in the present embodiment, the confirmation processing performed after the initialization of the large-scale information system described above is performed for the confirmation process of the connected device by receiving the state change notification with a time difference for each channel.

  Hereinafter, this will be described in more detail.

  FIG. 1 is a block diagram showing a conceptual configuration of a node device 10 that can be used in a fiber channel network as described above. In FIG. 1, a node device 10 is, for example, a server, a computer such as a PC, or a computer system (device using a computer) that can be connected to an FC switch network 20 (see FIG. 7).

  Here, in this embodiment, a fiber channel network (FC network) will be described as an example for the sake of convenience. However, the present invention is not limited to the FC network, and there is a change in topology such as addition / deletion of node devices. Each node device sends a status change notification to notify all registered node devices, and each node device that has received the status change notification makes an inquiry to the server that stores the network connection configuration information. Any network that can obtain network connection configuration information can be applied to the node device.

  In FIG. 1, a node device 10 is capable of high-speed bidirectional communication using a CPU (central processing unit) 12, a main storage device 14, a large-capacity auxiliary storage device 16, and at least one fiber channel FC1, FC2,. A fiber channel control unit (FC control unit) 18 and a bus 19 for transferring data between them. The auxiliary storage device 16 stores an FC control program 162 for controlling the fiber channel according to a preferred embodiment of the present invention.

  In the FC control program 162, it is determined whether or not the information processing system is in an initialized state (hereinafter referred to as “system initialization”). In general, an information processing system is in a special state during system initialization, and there are several ways for a control program to know this state. In particular, the initialization of an IO interface such as a fiber channel is performed by an OS (operating system) (not shown) starting a control program installation process or the like, and at this time, the OS can be notified that the system is being initialized. By providing a new interface with the OS as described above, it is possible to determine whether or not the system is being initialized. Therefore, the node device 10 holds a boot flag 142 indicating whether or not the system is being initialized in the main storage device 14.

  The OS described above indicates that the system is being initialized by setting data other than “0” in the boot flag 142 before performing system initialization. After performing this setting, each channel is initialized. Are controlled in order. When the system initialization is completed, “0” is set in the boot flag 142. As a result, it is possible to access the boot flag 142 of the main storage device 14 as necessary to check whether the system is being initialized.

  A timer (referred to as an RSCN reception timer in the above description) is used for time management. Therefore, an initial value is stored, and a storage location for incrementing or decrementing in response to a timer interrupt from a clock (not shown) is secured in the main storage device 14 as a timer register 146. The number of times that the timer register 146 should be incremented or decremented in order to obtain a desired elapsed time is temporarily called a timer set value. In order to determine the timer set value, a system initialization time BT164 described later and a delay time (DTi) (or unit delay time (UT)) 166 set in advance for each channel are stored in the auxiliary storage device 16.

  Further, the main storage device 14 holds a time-out flag (not shown) indicating that a time-out (the number of increments or decrements of the timer register 146 has reached the timer set value) has occurred. This timeout flag is controlled so as to start a predetermined interrupt control program (not shown) as an interrupt to the software. The interrupt control program controls so that a program (timeout processing routine of FIG. 4 described later) associated with the interrupt caused by the timeout flag is called and executed.

  Here, when the node device 10 has a plurality of fiber channels, the RSCN reception flag 144 (described later) of the main storage device 14, the timer register 146, and the delay time (DTi) 166 specific to each channel of the auxiliary storage device 16 are: It is set for each channel.

  Based on the configuration having such a function, the node device 10 described above operates the flag management means and the information inquiry means provided in the node device 10 itself, and is intended to achieve the above-described object. It has become.

  Next, in the above-described embodiment, channel control at the time of initialization of the network system is executed according to the following procedure according to a predetermined program.

  First, in the network system according to the above embodiment, when the network topology is changed due to channel connection or the like, a state change notification related to the change is transmitted from the network switch network to the registered node devices, and each node device Is configured to query the connection configuration information with respect to the server that stores the network connection configuration information in response to receiving the state change notification.

  If the state change notification is received during system initialization, the flag indicating whether or not the state change notification is received without querying the connection configuration information is kept in the set state. (Flag management step) is executed, and when the flag is in the set state after the system initialization is completed, a step (information inquiry step) for inquiring the connection configuration information described above is executed. This avoids inquiring the connection configuration information that has been conventionally performed during system initialization, so that the processing load on the server and the network switch network of the FC network is greatly reduced, and the entire FC network functions quickly. It will be.

  Further, in the flag management step described above, specifically, after normal channel initialization, it operates when the system initialization is in progress and starts a timer assigned to the channel. And a step that operates when the state change notification is received during the system initialization and restarts the timer. Further, in the above-described information inquiry step, when the above-described timer expires and the flag is set, the above-described inquiry for connection configuration information is executed. Here, in the flag management step described above, the step of setting the set value of the timer to a value larger than the time required for system initialization is simultaneously executed. For this reason, it is possible to reduce processing associated with timeout, and to reduce the burden on the control unit of the node device.

  Further, the step of setting a specific delay time for each channel, the port on the node device side of each channel, or the port on the aforementioned network switch network 20 side of each channel, The step of setting the set value to a value corresponding to the sum of the time required for system initialization and the delay time set in advance for the channel is simultaneously executed as necessary. Here, the set value of the timer in the flag management step may be executed in the following procedure. That is, a serial number is set for each channel, a port on the node device side of each channel, or a port on the network switch network side of each channel, and then the timer set value is initialized to the system. Is set to a value corresponding to the sum of the unit time and the continuous time set for the channel or the associated serial number. According to this, since the inquiry of the connection configuration information by each channel does not occur at the same time, it is possible to avoid inundation of access to the server of the FC network and the network switch network in advance.

  On the other hand, when the above-described network switch network 20 is composed of a single switch, a unique delay time is set for each port on the single switch side to which each channel is connected. The set value may be set to a value corresponding to the sum of the time required for system initialization and the delay time set in advance for the channel. In this way, it is possible to obtain an advantage that a delay time unique to each channel can be set even if the ID of each node device is the same.

In the flag management step and the information inquiry step described above, a flag indicating whether or not the system is being initialized may be referred to. The CPU of the control unit of each node device described above is executed by a program comprising a code sequence.

  2 to 4 are diagrams for executing part or all of the above-described processing steps by the fiber channel control program (FC control program) 162 of the node device 10 capable of connecting to the FC network according to the best embodiment of the present invention. FIG. 9 is a flowchart showing a flow of initialization processing, RSCN reception processing, and RSCN reception timer timeout processing.

FIG. 2 is a flowchart of an initialization processing routine that is executed when the node device 10 is activated. In step S40, processing necessary for connecting to the FC network is executed. In the determination step S41, it is determined whether or not the connection to the FC network is successful. If the connection fails (that is, if the connection cannot be established), the connection to the FC network is performed again in step S42 or the connection to this channel is established. It is determined that the connection has failed and is terminated abnormally. On the other hand, if it is determined that the connection was successful in this determination step S 41, in step S43, by performing confirmation of accessible connection device, and notifies the information of the connection device in the OS.

  Next, in determination step S44, it is determined whether the system is being initialized (system boot). If the system is being initialized, the RSCN reception timer is started in step S45. The timer register 146 of the main storage device 14 is used as the RSCN reception timer. The set value T of this timer is the identifier of each channel FCi (i is the serial number of the channel to be initialized, i = 1, 2,... N), and the channels FC1 to FCn are initialized (ie, It is assumed that “T = BT + DTi” is set, where BT is a time required for system initialization (system initialization time) and DTi is a specific delay time preset for each channel.

  The specific time DTi set in advance for each channel FCi is such that in a large-scale system or the like, fiber channels connected to a plurality of node devices 10 may be connected to the same FC switch, and the timer times out. Each node device 10S (S = 1, 2, 3, 3) is set to the time when the timer times out using the connection port number of the FC switch so that the confirmation processing of the connected device to be executed later is not executed at the same time. ...... Set to generate a deviation for each fiber channel of n). Here, each node device 10S (S = 1, 2, 3,... N) includes the same components as the node device 10 described above and functions in the same manner.

  FIG. 3 is a flowchart of an RSCN reception processing routine executed when the node device 10S receives an RSCN from the FC network.

  Upon receiving the RSCN, each node device 10S first checks in step S50 whether the system is being initialized. If the system is not being initialized, the FC network configuration is changed for some reason in the FC network during system operation. Therefore, in step S51, the name server 22 is immediately checked for the connected device of the FC network (connection configuration inquiry), and the obtained connection configuration information is notified to the OS.

  On the other hand, if it is determined in the determination step S50 that the system is being initialized, the RSCN reception flag 144 is set in step S52. When the RSCN reception flag 144 is logic 1, it indicates that the RSCN has been received, but the connection configuration inquiry to be performed accordingly has not been completed. Next, in step 53, the timer value T is reset in the RSCN reception timer and restarted from the beginning.

  As described above, in this embodiment, when the node device 10 connected to the FC network receives the RSCN during activation, the node device 10 does not make a connection configuration inquiry to the name server 22 at least during activation. In this case, the connection configuration inquiry process for confirming the connected device is performed in the RSCN reception timer time-out process described below.

  FIG. 4 is a flowchart of a timeout process routine that is executed when the RSCN reception timer started in the initialization process of FIG. 2 or the RSCN reception process of FIG. 3 times out.

  In FIG. 4, when the timing operation of the RSCN reception timer is completed, a timeout processing routine is called. First, in decision step S60, it is confirmed whether or not the RSCN reception flag 144 is set.

  When the RSCN reception flag 144 is not set, the start of the timing operation that has just been completed is not due to RSCN reception, but is due to step S45 described in the initialization processing of FIG. Indicates that it has not been received. Therefore, in this case, the process ends without doing anything.

  On the other hand, if the RSCN reception flag 144 is set in the determination step S60, it indicates that the timing operation that has just been completed is due to step S53 described in the RSCN reception process of FIG. That is, since it indicates that the RSCN has been received during the operation of the RSCN reception timer, the RSCN reception flag 144 is reset (step S61), the connected device is confirmed by the connection configuration inquiry, and the obtained connection configuration information is notified to the OS. (Step S62).

  FIG. 5 shows the fiber channel control program of each node device 10S (S = 1, 2, 3,... N) when system initialization is executed in the information processing system using the node device 10 according to this embodiment. It is explanatory drawing which shows the timing of the initialization process to perform. In FIG. 5, when system initialization is performed, an OS (not shown) instructs the start of initialization of the fiber channel FC1 after setting the boot flag 142 of the main storage device 14 of FIG.

  In response to the initialization instruction 1, the FC control program 162 starts the initialization process of the fiber channel FC1, connects to the FC network, and connects through the FC switch network 20. Information on the disk device 30m (m = 1, 2, 3,... M) is acquired, information on this connected disk device 30M is reported to the OS (step 40-1), and an RSCN reception timer (not shown) of the channel FC1. (Step 45-1).

  The OS that has received the information regarding the connected device of the channel FC1 next instructs the start of initialization of the channel FC2.

  In response to the initialization instruction 2, the FC control program 162 starts the initialization process of the channel FC2, connects to the FC network, and connects to the disk device 30m (m = 1, 2) via the FC switch network 20. , 3,..., M) is acquired, information about the connected disk device 30M is reported to the OS (step 40-2), and the RSCN reception timer of channel 2 is started (step 45-2). The RSCN is transmitted to the channel FC1 by the connection of the channel FC2 to the FC network. In this RSCN reception process, the channel FC1 confirms the boot flag 142 of the main memory 14, sets the RSCN reception flag 144 when the system is being initialized (step 52), and restarts the RSCN reception timer (step 53). ).

  The same processing is continued after Fiber Channel FC3, and in response to the initialization instruction 2, the FC control program 162 starts the initialization processing of the channel FCn, connects to the FC network, and connects through the FC switch network 20. Information on the disk devices 301 to 30m being acquired is reported, information on the connected disk device 30M is reported to the OS (step 40n), and the RSCN reception timer of the channel FCn is started (step 45n). By connecting the channel FCn to the FC network, the RSCN is transmitted to the channels FC1 to FCn. Each fiber channel of FC1 to FCn confirms the boot flag 142 of each main storage device 14 by this RSCN reception processing, and sets the RSCN reception flag 144 when the system is being initialized (step 52), and the RSCN reception timer. Is restarted (step 53).

  In the above process, the node device 10S (S = 1, 2, 3,... N) whose RSCN reception timer (not shown) has timed out (timer expired) performs the connection configuration confirmation processing in steps 60 to 62 of FIG. 4 for the first time. . As described in the RSCN reception process of FIG. 2, the RSCN reception timer does not time out during system initialization, so the name server 22 inquiry, that is, the connection configuration confirmation process is performed only once by each of the node devices 101 to 10n. (See FIG. 3).

  Furthermore, since the RSCN reception timer of each channel is set with a unique time set in advance for each channel, it is avoided that the connection configuration confirmation process (that is, name server inquiry) of each channel is executed simultaneously. And the load on the FC switch 20 can be reduced.

<< Second Embodiment >>
In the first embodiment described above, the case where the FC switch network 20 is configured by a plurality of FC switches is illustrated, but here, a case where the FC switch network 20 is a single FC switch will be described.

  FIG. 6 is a schematic block diagram illustrating a configuration example of an FC network in which a plurality of nodes are connected to the same FC switch. In FIG. 6, one node is connected to each node device 10b-s (s = 1, 2, 3, 4,... N) of nodes 0 to 4, and each is connected to the FC switch 20A. Further, disk devices 301 and 302 are connected to the FC switch 20A.

  In this case, if the same control as in the case of the first embodiment described above is performed, a fiber channel is connected to channel 1 in each node. Therefore, the time when the channel number is used as the inherent time of the set value of the RSCN reception timer When the nodes are activated all at once, the setting value of the RSCN reception timer becomes the same, and the FC switch 20A is simultaneously accessed from all the nodes.

  Therefore, by setting the specific time using the port number connected to the FC switch 20A as the specific time of the setting value of the RSCN reception timer, a time lag occurs in accessing the FC switch 1 from each node. It is possible to reduce the load applied to the FC switch 20A. That is, the above-described network switch network is a single FC switch 20A, a step of setting a specific delay time for each port on the side of the single FC switch 20A to which each channel is connected, and the above-described timer And a step of setting the set value to a value corresponding to the sum of the time required for system initialization and the delay time set for the channel. According to this method, even when the channel ID of each node device is the same, a delay time specific to each channel can be set.

  Here, in each of the above-described embodiments, when at least one state change notification is received through the channel during system initialization for at least one channel enabling communication with the network described above, It may be configured to include an information inquiry means for inquiring connection configuration information once for at least one state change notification after the system initialization is completed. According to this configuration, unnecessary connection configuration information query is avoided, so that the processing load on the server and the network switch network is reduced.

<Modification>
In the first embodiment, the inherent time DTi preset for each channel FCi may be managed in association with the port address on the fiber channel node device side. Also, management may be performed in association with the address of the FC switch to which the fiber channel is connected and the port number of the FC switch.

  Furthermore, the inherent time DTi set in advance for each channel FCi may be set with a difference of UT for each channel, so that all fiber channels, ports on the node side of the fiber channel, or fiber A serial number SNi (i = 1, 2,... N) may be attached to any of the ports on the FC switch network 20 side of the channel so that DTi = UT · SNi. That is, “T = BT + UT · SNi”.

  As described above, according to the present invention, even when the status change notification (RSCN) is concentrated at the time of system initialization, the increase in the burden on the FC switch is reduced effectively in response to this, and the response delay of the entire apparatus is reduced. The present invention provides an unprecedented excellent effect that it is possible to provide a channel control method upon initialization of a network system that can be eliminated, a program thereof, and a computer system using the program.

  The channel control method and program at the time of initialization of the network system according to the present invention, and the computer system (node device) using the same, all registered state change notifications for notifying the change in the network topology. Effective for reducing the load on the FC switch, where processing is concentrated at the time of system initialization in the network where each node device sends a query to the node device and inquires of the server that stores the network connection configuration information in response to this state change notification It is.

It is a schematic block diagram which shows the structure of the node apparatus which can be used as a node of the fiber channel network in 1st Embodiment. FIG. 2 is a flowchart showing an initialization processing routine executed when each node device is activated. The flowchart of the RSCN reception process routine performed when each node apparatus receives RSCN from a fiber channel network, 6 shows a flowchart of a timeout processing routine that is executed when the RSCN reception timer times out. It is explanatory drawing which shows the initialization process which the fiber channel control program of each node apparatus in 2nd Embodiment performs. It is a schematic block diagram which shows the structural example of FC network with which multiple nodes are connected to the same FC switch by 2nd Embodiment. It is a figure which shows a prior art example, and is a schematic block diagram which shows the information processing system which employ | adopted the fiber channel network. It is a figure which shows the operation | movement of each element and the flow of information at the time of starting the node of the fiber channel network disclosed by the prior art example of FIG. 7 in order.

Explanation of symbols

10, 10a, 10b, (10b-s) Node device 12 CPU
14 Main storage device 16 Auxiliary storage device 18 FC controller 20, 20A Fiber channel switch network (FC switch network: fabric)
22 Name server 30 Disk device 100 Computer network 162 FC control program 200 Fiber channel network (information processing system)

Claims (15)

When there is a change in the network topology due to channel connection or the like, a state change notification related to the change is transmitted from the network switch network to the registered node device, and each node device responds to the reception of the state change notification. In the channel control method at the time of initialization of the network system configured to query the connection configuration information to the server that stores the network connection configuration information,
A flag management step of maintaining a reception flag indicating whether or not the state change notification has been received without inquiring the connection configuration information when the state change notification is received during the system initialization. When,
After the system initialization has been completed, if the received flag is the set state, viewed contains an information inquiry step of querying the connection configuration information,
The flag management step and the inquiry step include a step of referring to a boot flag indicating whether or not the system initialization is in progress.
A channel control method for initializing a network system. The flag management step includes a timer start step for starting a timer assigned to the channel when the system initialization is in progress after normal channel initialization, and during the system initialization. A timer restarting step of restarting the timer when receiving the state change notification,
Said information inquiry step, a network system initialization according to claim 1, wherein the comprising the information inquiry step of querying the connection configuration information when the timer expires and the received flag is the set state Time channel control method. 3. The channel control method at the time of network system initialization according to claim 2 , wherein the flag management step includes a step of setting a set value of the timer to a value larger than a time required for the system initialization. A step of setting a specific delay time for each channel, a port on the node device side of each channel, or a port on the network switch network side of each channel; and a set value of the timer, 3. The channel control method at the time of network system initialization according to claim 2 , further comprising the step of setting to a value corresponding to the sum of the time required for initialization and the delay time set for the channel. A step of setting a serial number to each channel, a port on the node device side of each channel, or a port on the network switch network side of each channel, and a time required for the initialization of the timer 3. The network system initialization time according to claim 2 , further comprising a step of setting a value corresponding to a sum of a serial number multiplied by a unit time to the serial number set or associated with the channel. Channel control method. Wherein becomes network switch network from a single switch, a step of respectively setting a delay time specific to the single switch side ports each channel is connected, the system initializes a set value of the timer 3. The channel control method at the time of network system initialization according to claim 2 , further comprising the step of setting to a value corresponding to the sum of the time required for the delay and the delay time set for the channel. The network system initial stage according to any one of claims 1 to 4 , wherein the channel is a fiber channel, the network is a fiber channel network, and the network switch network is a network of fiber channel switches. Channel control method during conversion. A program comprising a code sequence, wherein the control unit of each node device executes the steps according to the channel control method at the time of initialization of the network system according to any one of claims 1 to 7 . When there is a change in the network topology due to channel connection or the like, a status change notification related to the change is transmitted from the network switch network to all registered node devices, and each node device receives the status change notification. A computer system that can be one of a number of node devices that inquires connection configuration information to a server that stores network connection configuration information accordingly,
The node device operates when the state change notification is received during system initialization for initializing at least some of the node devices of the multiple node devices, and does not query the connection configuration information. A flag management means for maintaining a reception flag indicating whether or not the status change notification has been received in a set state, and the connection when the reception flag is in a set state after the system initialization is completed. and information inquiry means for performing a query of the configuration information only including,
The flag management means and the information inquiry means have a flag reference function for referring to a boot flag indicating whether or not the system initialization is in progress.
A computer system characterized by that. An activation timing setting function for starting the timer assigned to the channel by operating when the flag management means performs normal channel initialization and is in the middle of the system initialization; A restart timing setting function that operates when the state change notification is received during conversion, and restarts the timer;
The inquiry means, according to claim 9, wherein further comprising a query timing setting function for querying the timer expired and the connection configuration information by activated when the received flag is the set state Computer system. 11. The computer system according to claim 10 , wherein the set value of the timer is larger than the time required for the system initialization. Delay in which the flag management means of each node device sets a specific delay time corresponding to any one of the channel, the node-side port of each channel, or the port on the network switch network side of each channel A time setting function, and a delay time summation function for setting the set value of the timer to a value corresponding to the sum of the time required for system initialization and the delay time set for the channel. The computer system according to claim 10 . The flag management unit of each node device sets a serial number to each channel, a port on the node device side of each channel or a port on the network switch network side of each channel, and And a function of setting a set value to a value corresponding to a sum of a time required for the system initialization and a value obtained by multiplying the serial number set and related to the channel by a unit time. The computer system according to claim 10 . The network switch network is composed of a single switch, and each node device sets a unique delay time for a port on the side of the single switch to which each channel is connected, and the timer 11. The computer system according to claim 10, further comprising means for setting a set value to a value corresponding to the sum of the time required for the system initialization and the delay time set for the channel. The channel is a Fiber Channel, the network is a Fiber Channel network, the computer system according to any one of claims 9 to 14 characterized in that the network switch network is a network of fiber channel switch .

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