JP2009282643A - Pseudo test method for switch, pseudo test program, and pseudo test device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for performing a pseudo evaluation test by one FC switch by the use of an RSCN signal when two or more FC switches are connected to each other. <P>SOLUTION: The RSCN signal transmitted in cascade connection is the same as a RSCN signal transmitted in the setting change of a zone of the FC switch. By using this , the RSCN signal being the same as that in a physical connection change operation for instantaneously interrupting a cascade connection cable is transmitted by the configuration of one switch. Then, two or more zone sets are prepared so as to perform change in the middle of the evaluation test. Thus, the operation is attained which is the same as the operation where the cascade connection of the FC switch is newly performed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for performing an evaluation test of a cascade function, which is normally performed by using two or more FC (fiber channel) switches, with a single FC switch.

  In a backbone system such as an online system of a bank, an example in which a host device and a storage (also referred to as RAID: Redundant Array of Inexpensive Disks) device are connected in a fiber channel (FC) configuration is increasing. In general, as shown in FIG. 8, the Fiber Channel configuration includes an HBA (Host Bus Adapter) 21, an FC switch (Fibre Channel Switch) 1, and a storage device 3 that are mounted on the host device 2 and used. It is configured to be connected by an FC cable (optical fiber cable) 4 (see, for example, Patent Documents 1 and 2).

  In a large-scale system, as shown in FIG. 9, there may be a configuration in which a plurality of FC switches 1 are connected in series (FC switch cascade connection).

  In the cascade connection state, when the cascade connection cable 5 that connects the FC switches is interrupted for some reason, the FC switch 1 is subjected to RSCN (Registered State Change Notification) based on the fiber channel specifications. Is sent to the HBA 21 and the storage device 3 to notify that the cable has been disconnected. When the HBA 21 or the storage device 3 receives the RSCN signal, the I / O (Input / Output) being executed is once discarded, and the I / O is retransmitted after confirming the connection state, so that the cable is momentarily disconnected. In addition, I / O can be continued and resources can be released when the connection is lost.

At this time, in order to confirm the transmission of the RSCN signal at the time of the cascade connection and to verify the operation of the system including the host device 2, HBA 21, and storage device 3 associated therewith, as shown in FIG. It was necessary to insert / remove the cascade connection cable 5 between the switches in the connected state. The procedure by the conventional test method when two FC switches are cascade-connected is shown below.
Procedure 1: Disconnect the cascade connection cable 5 during system operation in order to simulate a transmission path abnormality in the cascade connection path.
Procedure 2: An RSCN signal that cannot identify the port from the FC port (or communication port, hereinafter simply referred to as a port) connected to the storage apparatus 3 and the HBA 21 indicates that there has been a configuration change. And broadcast to the port of the storage device 3.
Step 3: With the reception of the RSCN signal whose port cannot be specified, each port inquires of the other party currently connected to the FC switch 1, and as a result, it is found that it is not connected. Since the connection between the storage apparatuses 3 is interrupted, the operating application is abnormally terminated.
Step 4: After that, when the cascade connection cable 5 is connected again to the host device 1 and the storage device 3 by the RSCN signal whose port cannot be specified, it is confirmed that the configuration change has occurred in the ports of the host device 2 and the storage device 3. Broadcast.
Step 5: Receiving RSCN signal whose port cannot be specified, each port inquires about the other party currently connected to FC switch 1, and as a result, it is known that it is connected, so restart the application When it is done, it works normally.

  As explained in the above procedure, in order to check whether the series of operations in the FC switch is as expected, specifically, when an application terminates abnormally, whether appropriate error processing works or cable The operation of the entire system is checked, for example, whether the application restarts without any problem when restarting after connection.

However, in order to improve the reliability of the system, it is necessary to verify the cascade connection as described above, and it is necessary to prepare a plurality of FC switches for implementation, which is a problem in terms of cost. It has become.
JP 2006-39875 A JP 2006-279347 A

  Therefore, in order to solve the above-described problem, the present invention uses the fact that the RSCN signal transmitted at the time of cascade connection is the same as the RSCN signal transmitted at the time of changing the setting of the zone of the FC switch. A pseudo test method, a pseudo test program for a switch that pseudo-tests the cascade connection function of an FC switch that causes the same RSCN signal to be transmitted in a configuration with one FC switch as in the case of a physical connection change operation of instantaneous interruption, And a pseudo test apparatus. Specifically, for example, by preparing two types of zone sets and changing the zone sets during the evaluation test, the same pseudo operation as when FC switches are newly connected in cascade is realized. is there.

  According to a first aspect of the present invention, a switch for determining a communication path between a plurality of communication ports is a pseudo test of a switch for testing a connection function between a host apparatus and a storage apparatus in a case where a plurality of switches are connected in series in multiple stages. The control device of the switch defines a communication path that forms a pair of a communication port on the host apparatus side and a communication port on the storage apparatus side in the switch, and a communication path group formed by combining the communication paths When a plurality of communication path groups are set and stored in the storage area, two or more communication path groups are selected from the stored communication path groups, and the selected two or more communication path groups are switched during operation. Sending a state change notification signal generated at the communication port of the switch to the host device and the storage device to determine the connection; In accordance with the determination result, a step of turning ON / OFF the connection between the storage device and the communication port to a pseudo test for the switch, characterized in that it comprises a.

  That is, according to the first invention, in the switch pseudo test method, the switch control device is configured such that the storage unit forms a pair of a communication port on the host device side and a communication port on the storage device side in the switch. A plurality of communication path groups that are combinations of communication paths are set and stored in the storage area, the selection means selects two or more communication path groups from the stored communication path groups, and the determination means is selected. When the two or more communication path groups are switched during operation, the state change notification signal generated at the communication port of the switch is transmitted to the host device and the storage device to determine the connection, and the storage is determined according to the determination result. By configuring the connection between the device and the communication port to be ON / OFF, when multiple switches are connected in series in multiple stages Thus, when there is a change in the path such as the connection between the switches being disconnected, it is possible to send a status change notification signal sent from the switch communication port even with a single switch configuration. A connection function test performed using two or more switches can be simulated with one switch.

  As described above, according to the present invention described above, an RSCN (state change notification) signal transmitted at the time of cascade connection in which a plurality of switches are connected in series in multiple stages is transmitted to one FC switch by a test device that is controlled by a test program. With this configuration, it is possible to perform the evaluation test of the cascade function, which is usually performed using two or more switches, with a single FC switch.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a functional block diagram of cascade connection evaluation in a fiber channel switch according to an embodiment of the present invention.

  The function of the FC switch (fiber channel switch) 1 in the present embodiment focuses on the evaluation of the cascade connection function (a plurality of switches are connected in series in multiple stages) according to the present invention. Other functions provided in the FC switch 1 Since this is the same as the conventional one, it is omitted in the following description. Although not shown, the FC switch 1 is a computer that includes a CPU (Central Processing Unit) and a memory, and further includes a control unit.

  The FC switch 1 defines a zone (communication path) that forms a pair of a port on the host apparatus side and a port on the storage apparatus side in the FC switch 1, and a plurality of zone sets (communication path group) combining the zones ) For setting the zone set, the zone set storage unit 102 for storing the plurality of zone sets in the storage area in the FC switch 1, and the zone set to be evaluated from the plurality of stored zone sets. Zone set selection unit 103 to be selected, zone set switching unit 104 for switching and evaluating a plurality of selected target zone sets during operation, FC port from RSCN signal transmitted from FC switch to host device and storage device at the time of switching The port connection determination unit 105 that determines the other party to connect to, and the storage according to the result Composed of connection processing unit 106 to perform connection with the di device.

  The FC switch 1 receives a command input from the administrator from the console terminal 10 and processes a test program having the above-described configuration in order to connect the host device and the storage device.

  Hereinafter, the principle of the present invention for evaluating the cascade function with a single FC switch will be described with reference to FIGS.

  FIG. 2 shows a zone setting example for evaluating the cascade function according to the embodiment of the present invention with one FC switch.

  In the FC switch 1, a zone set A (FIG. 2A) and a zone set B (FIG. 2B) are prepared in advance as two types of zone sets (communication path group). A zone (communication path) is surrounded by a dotted line. Any number of these zones can be set on the same FC switch 1, and each zone is given a name. In FIG. 2, the zones 1, 2, 3, 4, and 5 are temporarily named.

  A zone set is defined as a group of these individual zones. Zone set A in FIG. 2A belongs to zone 1, zone 2 and zone 3, and zone set B in FIG. 2B belongs to zone 3 and zone 4. When zone set A is enabled, only zone 1, zone 2, and zone 3 are enabled simultaneously, and when zone set B is enabled, only zone 3 and zone 4 are enabled. These zone set settings can be switched at any time.

  FIG. 3 is a diagram for explaining a connection state between a switch and other devices according to the zone set according to the embodiment of the present invention.

  As an initial state, the zone of the FC switch 1 is set to zone set A, and is connected to the HBA 21 and storage device 3 provided in the host device 2 as shown in the figure. FIG. 3A shows the case of zone set A as an initial connection state, and FIG. 3B shows the case of zone set B after connection change.

  FIG. 4 is a diagram for explaining a connection state between the switch after port switching and another device according to the embodiment of the present invention.

  As shown in the figure, the connection on the storage apparatus 3 side is changed here. Then, the zone of the FC switch 1 is switched to the zone set B. By switching the zones in this way, the same RSCN signal as that when the FC switch is cascade-connected is transmitted to the other devices (host device 2, storage device 3). Until then, it is possible to use one FC switch 1 that requires more than one.

  When an error occurs in a cascade transmission line that connects between FC switches 1, it is impossible to specify which device is using that transmission line. Broadcast.

  When switching zone sets, a situation occurs in which some ports overlap in a plurality of zones across the FC switch 1, or a plurality of ports disappear from the zones at the same time. Therefore, when there is a change in the zone set, the configuration change is notified by the RSCN signal. However, because the configuration change can be notified by one RSCN notification for the above-described reason, the RSCN signal that cannot identify the port is used.

  FIG. 5 shows a format of an RSCN signal transmitted / received between the FC switch / other devices. The RSCN signal is a signal sent from the FC switch and used when notifying other devices such as the host device and storage device that the configuration has been changed when the FC switch is connected or disconnected. The format is defined by Fiber Channel specification FC-FS of ANSI (American National Standard).

  A frame, which is a basic unit in which data is transmitted and received by the fiber channel, includes an SOF (Start of Frame), a frame header, a data field, a CRC (Cyclic Redundancy Check), and an EOF (End of Frame). SOF is a 4-byte identifier attached to the head of the frame, and EOF is a 4-byte identifier attached to the end of the frame, and the boundary of the frame is indicated by SOF and EOF. In the fiber channel, an idle signal flows when there is no frame.

  The frame header includes frame type, upper protocol type, N_Port_ID information representing the source / destination address, N_Port_Name information representing the port identifier, and the like. In addition, a header of an upper layer is attached to the head of the data field, followed by a payload portion that carries the data itself. The CRC is a 4-byte check code for checking the data in the frame header and data field.

  FIG. 5A shows a case where Port_ID is notified, and FIG. 5B shows a case where Port_ID is not specified. The transfer data is indicated in each field of Word 00 to 07 composed of 4 bytes between the SOF indicating the start of the frame and the EOF indicating the end.

  In the format example of FIG. 5, for example, when Port_ID is notified, Type 0 and Port_ID are indicated in Word 7, and when Port_ID is not specified, Type 3 and fabric (switch) group are indicated.

  Note that there are the following four types of notifications such as Port in the above format.

Type 0: Port address Type 1: Area address group Type 2: Domain address group Type 3: Fabric address group Among these, Type 0 and Type 3 are used in the present invention. The port address of Type 0 is disconnected or connected at that port, indicating that there has been a configuration change. Type 3 has a configuration change when the switch port cannot be specified (when multiple ports are simultaneous) It shows that.

Here, in the above format, D_ID (Destination ID) is an address identifier on the frame receiving side, and S_ID (Source ID) is an N_Port address identifier on the frame transmitting side, each including N_Port_ID information and the like. . The contents of other abbreviations shown in the figure are as follows.
R_CTL (Routine Control): Indicates an attribute of data in relation to the frame type and other fields.
CS_CTL (Class Specific Control): Indicates class service specific control.
F_CTL (Frame Control): Indicates the sequence and exchange attributes such as the first sequence, the last sequence, and whether the transmission side is an originator or a responder.
SEQ_ID (Sequence ID): A number unique to the sequence, determined for each D_ID and S_ID pair.
DF_CTL (Data Field ID): When using an optional header, specifies the data length of the header.
SEQ_CTL (Sequence Count): Indicates the order of frames in one sequence or the order of sequences in the same exchange.
OX_ID (Originator Exchange ID): indicates an exchange number issued by an originator (transmission source).
RX_ID (Responder Exchange ID): Indicates an exchange number issued by a responder (reception destination).

  The cascade function evaluation flow according to the present invention described above will be described below with reference to FIGS.

FIG. 6 shows a zone set setting flow in the FC switch according to the embodiment of the present invention.
Step S1: Based on the data input by the administrator at the console terminal 10, a zone set is created by combining a plurality of zones of the FC port. For example, as an example of the zone set setting, as shown in FIG. 3, zone 1 (configured with FC port numbers 2 and 6), zone 2 (configured with FC port numbers 3 and 7), and zone 3 (FC port number 4) Zone set A under control of zone set A, and zone set B under control of zone 4 (configuration with FC port numbers 3 and 6) and zone 5 (configuration with FC port numbers 4 and 8) The set is set by the zone set setting unit 101.
Step S2: The created zone set is stored in a storage area in the FC switch.

FIG. 7 shows an evaluation flow (evaluation by one FC switch) in the test apparatus for the cascade function according to the embodiment of the present invention. In the present embodiment, an example is shown in which two zone sets A and B to be evaluated are selected by the zone set selection unit 103 among a plurality of zone sets stored in the zone set storage unit 102. In the following flow, the above two zone sets A and B are selected as a zone set using one FC switch, and one zone set is switched to the other zone set during operation.
Step S11: The zone set A is operated, and the currently operating zone set A is changed to the zone set B.
Step S12: Regarding the change of the state of the cascade connection path at the time of the change, an RSCN signal (Type 3) that cannot identify the FC port is transmitted to all ports of the host device 2 and the storage device 3.
Step S13: Accompanying the reception of the RSCN signal that cannot identify the FC port, each FC port inquires about the other party currently connected to the FC switch.
Step S14: The FC port determines whether or not there is a current connection partner.
Step S15: It is determined that the connection partner is not connected, and the connection path is disconnected by the host device. On the other hand, when a partner exists in step S14, error processing is performed in step S32.
Step S16: The FC port number is switched from 7 to 6 as a path on the storage side.
Step S17: When FC port number 6 is connected, an RSCN signal of Type 0 for notifying Port_ID from port number 3 is transmitted from the switch to the host device.
Step S18: Accompanying the reception of the RSCN signal specifying the FC port, the FC port inquires of the other party currently connected to the FC switch.
Step S19: It is determined whether or not the host device 2 and the storage device 3 are in the same zone.
Step S20: If it is determined that the host device 2 and the storage device 3 are in the same zone, a connection operation with the storage device 3 is performed. On the other hand, if it is determined in step S19 that they are not in the same zone, error processing is performed in step S32.
Step S21: Next, the path on the storage device 3 side is switched from the port number 6 to 7.
Step S22: When the port number is switched, the RSCN signal of Type 0 notifying the Port_ID from the port number 3 is transmitted from the switch to the host device.
Step S23: With the reception of the RSCN signal for specifying the port, the FC port inquires about the other party currently connected to the FC switch.
Step S24: It is determined whether or not the host device 2 and the storage device 3 are in the same zone.
Step S25: If the storage apparatus 3 is not in the same zone, it is determined that the storage apparatus 3 has been disconnected, and the host apparatus 2 disconnects the connection path and blocks the I / O operation. On the other hand, if it is determined in step S24 that they are in the same zone, it is processed as an error in step S33.
Step S26: Next, the zone set is returned from B to A.
Step S27: A Type 3 RSCN signal whose port cannot be specified is transmitted to the host apparatus 2 and the storage apparatus 3.
Step S28: With the reception of the RSCN signal in which the FC port cannot be specified, each FC port inquires about the partner currently connected to the FC switch.
Step S29: It is determined whether or not the host device 2 and the storage device 3 are in the same zone.
Step S30: If the host device 2 and the storage device 3 are in the same zone, a connection operation with the storage device 3 is performed. On the other hand, if it is determined in step S29 that it is not in the same zone, it is processed as an error in step S33.
Step S31: Then, the application is restarted to confirm normal operation.

It is a functional block diagram of cascade connection evaluation in the fiber channel switch which becomes embodiment of this invention. It is a figure which shows the example of a zone setting for evaluating the cascade function which becomes embodiment of this invention with one FC switch. It is a figure explaining the connection state of the switch and other apparatus by the zone set which becomes embodiment of this invention. It is a figure explaining the connection state of the switch after port switching which becomes embodiment of this invention, and another apparatus. This is the format of the RSCN signal transmitted / received between the FC switch / other devices. It is a figure which shows the setting flow of the zone set in the FC switch which becomes embodiment of this invention. It is a figure which shows the evaluation flow (evaluation by one FC switch) in the test apparatus of the cascade function which becomes embodiment of this invention. It is a connection example of a conventional Fiber Channel. It is an example of a conventional fiber channel large-scale system cascade connection. This is a conventional cascade connection test method.

Explanation of symbols

1 Fiber Channel switch (FC switch)
2 Host device 3 Storage device 4 FC cable 5 Cascade connection cable 10 Console terminal 11 FC port 21 HBA (host bus adapter)
DESCRIPTION OF SYMBOLS 101 Zone set setting part 102 Zone set memory | storage part 103 Zone set selection part 104 Zone set switching part 105 Port connection determination part 106 Connection processing part

Claims (3)

In a switch for determining a communication path between a plurality of communication ports, a pseudo test method for a switch that artificially tests a connection function between a host device and a storage device when a plurality of switches are connected in series in multiple stages,
In the control device of the switch,
Defining a communication path that forms a pair of a communication port on the host apparatus side and a communication port on the storage apparatus side in the switch, and setting a plurality of communication path groups formed by combining the communication paths and storing them in a storage area;
Selecting two or more communication path groups from the stored communication path groups;
A step of determining a connection by transmitting a state change notification signal generated at a communication port of the switch to the host device and the storage device when the selected two or more communication path groups are switched during operation;
Turning on / off the connection between the storage device and the communication port according to the determination result;
A pseudo test method for a switch, characterized in that A switch for determining a communication path between a plurality of communication ports, a pseudo test program for a switch that artificially tests a connection function between a host device and a storage device when a plurality of switches are connected in series in multiple stages,
In the control device of the switch,
Defining a communication path that forms a pair of a communication port on the host apparatus side and a communication port on the storage apparatus side in the switch, and setting a plurality of communication path groups formed by combining the communication paths and storing them in a storage area;
Selecting two or more communication path groups from the stored communication path groups;
A step of determining a connection by transmitting a state change notification signal generated at a communication port of the switch to the host device and the storage device when the selected two or more communication path groups are switched during operation;
Turning on / off the connection between the storage device and the communication port according to the determination result;
A switch pseudo-test program that executes A switch that determines a communication path between a plurality of communication ports, a pseudo test device for a switch that artificially tests a connection function between a host device and a storage device when a plurality of switches are connected in series in multiple stages,
Means for defining a communication path forming a pair of a communication port on the host apparatus side and a communication port on the storage apparatus side in the switch, and setting a plurality of communication path groups formed by combining the communication paths and storing them in a storage area;
Means for selecting two or more communication path groups from the stored communication path groups;
Means for determining a connection by transmitting a state change notification signal generated at the communication port of the switch to the host device and the storage device when the selected two or more communication path groups are switched during operation;
Means for turning ON / OFF the connection between the storage device and the communication port according to the determination result;
A switch pseudo-testing device characterized by comprising:

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