JP2004164490A - Storage assignment device, storage assignment method, storage assignment program and medium with program recorded thereon - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically assign storages to hosts without changing the setting of storage routers in an iSCSI storage system. <P>SOLUTION: The plurality of storages 2 previously connected to fiber channel networks or SCSI buses in the storage routers 3 are assigned to the virtual hosts. When timing of log-in to the storages 2 from the hosts 1 is detected by a storage assignment device 4 connected between an IP network 5 and the storage routers 3, a host identifier in an IP packet received from the hosts 1 is replaced with a virtual host identifier based on the previously established rule of the assignment of the storages to the hosts. The virtual host identifier in the IP packet received from the storage routers 3 is replaced with the host identifier. The storages 2 are automatically assigned to the hosts 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to allocation of storage (storage device) to a host computer in an iSCSI storage system.
[0002]
[Prior art]
Conventionally, in a storage system configured only with a Fiber Channel network, allocation of storage such as a magnetic disk device to a host computer (hereinafter abbreviated as a host) is performed by manually setting grouping between ports in a Fiber Channel switch. Or by giving only a specific host in the storage access right to the storage (Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-74128
[Problems to be solved by the invention]
However, with the emergence of an iSCSI storage system and the emergence of a storage router, storage allocation to hosts has basically been all manually set in the storage router, resulting in the following problems. .
[0005]
In the setting on the storage router, first, the initial setting is performed, the storage and the host are registered, and then the storage allocation setting is performed. For this reason, when a department that manages and registers facilities such as storage is separated from a department that manages only storage allocation, there is a case where each other's work is violated.
[0006]
-Since the storage allocation setting on the storage router is performed manually, there is a case where the storage cannot be recognized from the host due to a setting error, or a storage that should not be allocated to the host is allocated.
[0007]
-It was not possible to make reservation settings to allocate another storage to a host to which storage had already been allocated, after releasing the allocation once.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems and to easily perform storage allocation to a newly registered host and change of storage allocation to a host without requiring a change in storage router settings. It is to be.
[0009]
[Means for Solving the Problems]
In the present invention, in order to achieve the above object, based on a preset storage allocation rule for the host, any of the virtual hosts previously allocated to any storage in the storage router, Is connected between the IP network and the storage router, and in the session establishment detection mechanism of the storage allocating device, the host logs in to the storage for the first time, or the host logs out of all the storages once, and then renews the storage. The timing of establishing a session to log in to the host is detected by managing information on the session between the host and the storage router and the TCP connection, and the storage allocation mechanism allocates storage to the host in advance. Based on the rules, a host identifier that can uniquely identify the host in the iSCSI PDU in the IP packet received from the host is replaced with a virtual identifier that can uniquely identify any of the virtual hosts previously assigned to any storage in the storage router. The storage is automatically assigned to the host by replacing the virtual host identifier in the iSCSI PDU in the IP packet received from the storage router with the host identifier.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described in detail with reference to the drawings.
[0011]
FIG. 1 shows the overall configuration of an iSCSI storage system according to the present invention. In the figure, 1 is at least one (two in the illustrated example) hosts, 2 is a plurality of (five in the illustrated example) storages, and 3 is At least one (two in the illustrated example) storage routers and 4 are storage allocation devices.
[0012]
The host 1 is connected to an IP network 5, the storage 2 is connected to a fiber channel network or a SCSI bus 6, and the storage router 3 is connected to both the IP network 5 and the fiber channel network or a SCSI bus 6. The storage allocation device 4 is connected between the IP network 5 and the storage router 3.
[0013]
FIG. 2 shows an example of an embodiment of the storage allocation device 4 of the present invention, which comprises a session establishment detection mechanism 41 and a storage allocation mechanism 42.
[0014]
The session establishment detection mechanism 41 manages the session and the TCP connection information between the host 1 and the storage router 3 so that the host 1 logs in to the storage 2 for the first time or the host 1 The timing of establishing a session for logging out and logging in to the storage 2 again is detected.
[0015]
When the session allocation timing is detected, the storage allocation mechanism 42 allocates the storage router 3 to an arbitrary storage 2 in advance based on a preset storage allocation rule for the host while the session is established. By allocating one of the virtual hosts to the host 1 to log in, an arbitrary storage 2 is allocated to the host 1.
[0016]
More specifically, a virtual host in which the storage router 3 has previously assigned a host identifier that can uniquely identify the host 1 in the iSCSI Protocol I Data Unit (PDU) in the IP packet received from the host 1 to an arbitrary storage 2 in the storage router 3 (A host that appears to exist virtually) is replaced with a virtual host identifier that can be uniquely identified, and the virtual host identifier in an iSCSI PDU in an IP packet received from the storage router 3 is replaced with the host identifier. Thus, an arbitrary storage 2 is allocated to the host 1.
[0017]
As an example of a preset rule for allocating storage to a host in the storage allocating mechanism 42, here, a (real) host that performs storage allocation on the assumption that the storage 2 is allocated to a virtual host in the storage router 3 It is assumed that a table indicating the correspondence between the virtual host and the virtual host is created in advance.
[0018]
Actually, the storage allocation mechanism 42 determines the correspondence between the host that performs storage allocation and the virtual host at the time of the next storage login, as shown in FIG. FIG. 4 shows a table (hereinafter, referred to as a reservation allocation table) and a correspondence between a host that allocates storage and a virtual host at the present time as a set of a host identifier and a virtual host identifier. (Hereinafter, referred to as a current assignment table) and a detailed information table.
[0019]
The detailed information table holds detailed information of each host. As shown in FIG. 5, a host identifier of a host to which storage is allocated, a session identifier for uniquely identifying a session for logging in to storage, and a connection It has a connection identifier that can be uniquely identified, a session deletion schedule, a connection deletion schedule, a host port number, and a host IP address. Note that the session deletion schedule and the connection deletion schedule have values with or without, and the default is a value with no.
[0020]
Instead of creating a reservation assignment table, each time a host logs in, a storage that is considered appropriate, for example, a storage with a low usage rate may be selected and a virtual host corresponding thereto may be assigned.
[0021]
First, an outline of the operation of the present system will be described.
[0022]
When registering the storage 2 in the storage router 3, the equipment manager manually allocates this storage to the virtual host. For example, when the new storages are 2A and 2B and the virtual host identifiers are iqn1 to iqn30, the storage 2A is allocated to the virtual hosts with the virtual host identifiers iqn1 to iqn10, and the storage 2B is allocated to the virtual hosts with the virtual host identifiers iqn11 to iqn20. Assignment is set so that the storage 2A and the storage 2B are assigned to the virtual host having the virtual host identifier iqn21 to iqn30.
[0023]
In addition, since the operator who allocates the storage allocates an arbitrary storage 2 to the host 1 to be newly logged in, the host identifier of the host 1 to be newly logged in and the arbitrary storage 2 in the storage router 3 in the reservation assignment table. Is described with the virtual host identifier of the virtual host to which is assigned. For example, if the host identifier of the host 1 to be newly logged in is iqnXXX, and the storage to be allocated is 2B, the host identifier iqnXXX and the virtual host identifier of the virtual host to which the storage 2B is allocated in the storage router 3 in the reservation allocation table. For example, a pair with iqn11 is described.
[0024]
In the storage allocation device 4, the session establishment detection mechanism 41 detects the timing at which a session for the host 1 to log in to the storage 2 is established. A current assignment table is created, and based on the current assignment table, the host identifier iqnXXX in the iSCSI PDU in the IP packet transmitted from the host 1 (host identifier iqnXXX) to the storage allocation device 4 is replaced with the virtual host identifier iqn11. Also, the virtual host identifier iqn11 in the iSCSI PDU in the IP packet transmitted from the storage 2B is replaced with the host identifier iqnXXX.
[0025]
Thereby, the storage 2B allocated to the virtual host (virtual host identifier iqn11) can be automatically allocated to the host 1 (host identifier iqnXXX).
[0026]
FIG. 6 is a flow chart of a process in the session establishment detecting mechanism, and FIGS. 7 to 11 are flow charts of a process in the storage allocating mechanism. Will be described in detail.
[0027]
Upon receiving the IP packet, the session establishment detecting mechanism 41 looks at the information (Oncode information) indicating the type of iSCSI PDU in the PDU in the IP packet if the IP packet is received from the host 1 or the storage router 3, and then logs in. An IP packet that is a Request, Login Response, Logout Request, or Logout Response is extracted and passed to the storage allocation mechanism 42. When the Oncode information is other than the above, the IP packet received from the host 1 is transmitted to the storage router 3 as it is, and the IP packet received from the storage router 3 is transmitted to the host 1 as it is.
[0028]
The storage allocation mechanism 42 executes the following different processes (1), (2), (3), and (4) according to the Oncode information in the iSCSI PDU in the IP packet.
[0029]
(1) When the Oncode information in the iSCSI PDU in the IP packet is Login Request, a host identifier, a session type, a session identifier, and a connection identifier are extracted from the iSCSI PDU in the IP packet, and the IP is extracted from the IP header in the IP packet. The IP address of the host that transmitted the packet is extracted, and the port number of the host for establishing a connection is extracted from the TCP header in the IP packet.
[0030]
Here, the session type indicates whether the purpose of establishing a session is to discover a storage (Discovery) or not (Normal operation).
[0031]
If the session type is Discovery, it is checked whether the extracted host identifier exists in the current assignment table and the detailed information table.
[0032]
When the extracted host identifier is present in the current assignment table and the detailed information table, the host identifier in the iSCSI PDU in the IP packet is changed to a virtual host identifier according to the current assignment table, and is passed to the session establishment detection mechanism 41.
[0033]
If the extracted host identifier does not exist in the current assignment table, or if it exists in the current assignment table but does not exist in the detailed information table, it is checked whether the corresponding host identifier exists in the reservation assignment table.
[0034]
When the host identifier exists in the reservation assignment table, the host identifier in the iSCSI PDU in the IP packet is changed to a virtual host identifier as shown in the reservation assignment table, and a set of the host identifier and the virtual host identifier as shown in the reservation assignment table is changed. Is described in the current assignment table, and the detailed information table describes the host identifier, the session identifier, the connection identifier, the port number, the IP address, the scheduled session deletion and the scheduled connection deletion schedule, and passes the IP packet to the session establishment detection mechanism 41. . However, if there is a row of the host identifier corresponding to the current assignment table, it is deleted once, and a set of the host identifier and the virtual host identifier according to the reservation assignment table is described again in the current assignment table.
[0035]
If the host identifier does not exist in the reservation assignment table, the IP packet is passed to the session establishment detection mechanism 41 as it is.
[0036]
If the session type is Normal, it is checked whether the extracted host identifier exists in the current assignment table.
[0037]
If the extracted host identifier is present in the current assignment table, the host identifier in the iSCSI PDU in the IP packet is changed to the virtual host identifier as shown in the current assignment table, and the host identifier, session identifier, connection identifier, The port number and the IP address are entered, and the IP packet is passed to the session establishment detecting mechanism 41. If a row with the same host identifier, the same session identifier, and the same connection identifier exists in the detailed information table, it is overwritten.
[0038]
If the extracted host identifier does not exist, the IP packet is passed to the session establishment detecting mechanism 41 as it is.
[0039]
(2) When the Oncode information in the iSCSI PDU in the IP packet is Login Response, the virtual host identifier, the session type, and the Request result are extracted from the iSCSI PDU in the IP packet, and the IP of the host is extracted from the IP header in the IP packet. The address is extracted, and the port number of the host is extracted from the TCP header in the IP packet.
[0040]
If the session type is Discovery, it is checked whether the extracted virtual host identifier exists in the current assignment table and whether the Request result is successful.
[0041]
If the extracted virtual host identifier is present in the current assignment table and the Request result is successful, the virtual host identifier in the iSCSI PDU in the IP packet is changed to the host identifier according to the current assignment table, and the session establishment of the IP packet is detected. Hand over to mechanism 41.
[0042]
If the extracted virtual host identifier is present in the current assignment table and the Request result is unsuccessful, the host identifier corresponding to the extracted virtual host identifier is searched in the current assignment table, and the corresponding host identifier exists in the detailed information table. Confirm whether or not.
[0043]
If the host identifier exists in the detailed information table, the virtual host identifier in the iSCSI PDU in the IP packet is changed to the host identifier as shown in the current allocation table, and the IP packet is passed to the session establishment detection mechanism 41.
[0044]
If the host identifier does not exist in the detailed information table, the virtual host identifier in the iSCSI PDU in the IP packet is changed to the host identifier as shown in the current allocation table, and a set of the corresponding host identifier and virtual host identifier in the current allocation table is changed. And passes the IP packet to the session establishment detection mechanism.
[0045]
If the extracted virtual host identifier does not exist in the current assignment table, the IP packet is passed to the session establishment detection mechanism 41 as it is.
[0046]
If the session type is Normal, it is checked whether the extracted virtual host identifier exists in the current assignment table and whether the Request result is successful.
[0047]
If the extracted virtual host identifier is present in the current assignment table and the Request result is successful, the virtual host identifier in the iSCSI PDU in the IP packet is changed to the host identifier according to the current assignment table, and the session establishment of the IP packet is detected. Give 41 to the mechanism.
[0048]
If the extracted virtual host identifier is present in the current status assignment table and the request result is unsuccessful, the detailed information table is searched for and deletes the line where the extracted IP address and port number match, and the iSCSI PDU in the IP packet is deleted. Is changed to the host identifier as shown in the current assignment table, and the IP packet is passed to the session establishment detecting mechanism 41.
[0049]
If the extracted virtual host identifier does not exist in the current assignment table, the IP packet is passed to the session establishment detection mechanism 41 as it is.
[0050]
(3) When the Oncode information in the iSCSI PDU in the IP packet is Logout Request, the connection identifier and the logout reason are extracted from the iSCSI PDU in the IP packet, and the host IP address is extracted from the IP header in the IP packet. .
[0051]
If the extracted logout reason is the disconnection of the session, a host identifier having the extracted IP address is searched in the detailed information table, and the same connection identifier as the extracted connection identifier is set in association with the host identifier. The session deletion schedule of the session identifier and the corresponding connection deletion schedule are set to “yes”, the host identifier in the iSCSI PDU in the IP packet is changed to the virtual host identifier according to the current allocation table, and the IP packet is detected for session establishment. Hand over to mechanism 41.
[0052]
If the extracted logout reason is disconnection or transfer of the connection, the host identifier having the extracted IP address is searched in the detailed information table, and the same connection identifier as the extracted connection identifier is searched for in relation to the host identifier. The deletion schedule is set to “yes”, the host identifier in the iSCSI PDU in the IP packet is changed to the virtual host identifier as shown in the current allocation table, and the IP packet is passed to the session establishment detection mechanism 41.
[0053]
(4) When the Oncode information in the iSCSI PDU in the IP packet is Logout Response, a Request result is extracted from the iSCSI PDU in the IP packet, and the IP address of the host is extracted from the IP header in the IP packet. The port number of the host is extracted from the TCP header of the host.
[0054]
When the extracted Request result is successful, the host identifier having the extracted IP address is searched in the detailed information table, and the virtual host identifier in the iSCSI PDU in the IP packet is changed to the host identifier according to the current allocation table, The IP packet is passed to the session establishment detecting mechanism 41, the connection identifier having the extracted IP address and port number is searched in the detailed information table, and the connection identifier is used to determine the connection deletion schedule and the session deletion schedule related to the corresponding connection. Extract.
[0055]
If the extracted session is to be deleted, all the rows related to the session are deleted. A row related to the host identifier having the extracted IP address is searched in the detailed information table, and if there is no search result, the corresponding set of host identifiers is deleted from the current assignment table.
[0056]
If the extracted session is not scheduled to be deleted, the line related to the relevant connection is deleted. A row related to the host identifier having the extracted IP address is searched in the detailed information table, and if there is no prosecution result, the corresponding set of host identifiers is deleted from the current assignment table.
[0057]
When the extracted Request result is unsuccessful, the host identifier having the extracted IP address is searched in the detailed information table, and the virtual host identifier in the iSCSI PDU in the IP packet is changed to the host identifier according to the current allocation table, The IP packet is passed to the session establishment detection mechanism 41.
[0058]
If the received IP packet is an IP packet passed from the storage allocating mechanism 42, the session establishment detecting mechanism 41 looks at the IP header and transmits the IP packet received from the host 1 to the storage router 3; 3 is transmitted to the host 1.
[0059]
Note that the storage allocation device of the present invention can also be realized by installing a program having the procedures shown in the flowcharts of FIGS. 6 to 11 in a known computer via a medium or a communication line.
[0060]
【The invention's effect】
As described above, according to the present invention, storage management / registration can be performed only by the storage router, and storage allocation to the host is performed by the storage allocation device. The assignment management departments do not infringe each other's work. Further, in the storage allocating device, the storage is automatically allocated to the host based on a preset storage allocation rule to the host, so that reservation setting can be performed, and input mistakes by humans can be eliminated.
[Brief description of the drawings]
1 is an overall configuration diagram of an iSCSI storage system according to the present invention; FIG. 2 is a configuration diagram showing an example of an embodiment of a storage allocation device according to the present invention; FIG. 3 is an explanatory diagram showing an example of a current allocation table; FIG. 5 is an explanatory diagram showing an example of a reservation allocation table. FIG. 5 is an explanatory diagram showing an example of a detailed information table. FIG. 6 is a flowchart of processing in a session establishment detection mechanism. FIG. 7 is a flowchart of processing in a storage allocation mechanism. Flow chart of processing in the storage allocation mechanism [FIG. 9] Flow chart of processing in the storage allocation mechanism [FIG. 10] Flow chart of processing in the storage allocation mechanism [FIG. 11] Flow chart of processing in the storage allocation mechanism [Description of reference numerals]
1: host, 2: storage, 3: storage router, 4: storage allocation device, 5: IP network, 6: fiber channel network or SCSI bus, 41: session establishment detection mechanism, 42: storage allocation mechanism.

Claims (15)

At least one host connected to the IP network, a plurality of storages connected to the Fiber Channel network or the SCSI bus, and connected to both the IP network and the Fiber Channel network or the SCSI bus to set storage allocation to the host A storage allocation device in an iSCSI storage system comprising at least one storage router, establishing a session between a host and the storage router, and reading and writing data according to a SCSI protocol over TCP / IP,
A virtual host connected between the IP network and the storage router, to which one of the virtual hosts previously allocated to an arbitrary storage in the storage router is allocated to the host to log in, based on a preset storage allocation rule for the host. Thereby allocating any storage to the host. At least one host connected to the IP network, a plurality of storages connected to the Fiber Channel network or the SCSI bus, and connected to both the IP network and the Fiber Channel network or the SCSI bus to set storage allocation to the host A storage allocation device in an iSCSI storage system comprising at least one storage router, establishing a session between a host and the storage router, and reading and writing data according to a SCSI protocol over TCP / IP,
A session establishment detection mechanism for detecting the establishment timing of a session in which the host logs in to the storage for the first time, or the host logs out of all the storages once, and logs in to the storage again;
A storage allocation mechanism that allocates one of the virtual hosts previously allocated to an arbitrary storage in the storage router to a host to be logged in based on a preset storage allocation rule for a host when detecting a session establishment timing. Consisting of
A storage allocating device connected between an IP network and a storage router. The storage allocation device according to claim 2,
The session establishment detection mechanism manages the session and the TCP connection information between the host and the storage router, so that the host logs in to the storage for the first time, or the host logs out of all the storages once and then logs in to the storage again. A storage allocation device for detecting a timing of establishing a session to be performed. The storage allocation device according to claim 2,
When detecting the session establishment timing, the storage allocation mechanism uniquely identifies the host in the iSCSI Protocol I Data Unit in the IP packet received from the host based on a preset storage allocation rule for the host. Is replaced with a virtual host identifier that can uniquely identify any of the virtual hosts previously allocated to any storage in the storage router, and the virtual host identifier in the iSCSI Protocol I Data Unit in the IP packet received from the storage router is replaced with the virtual host identifier. A storage allocating device, wherein the storage identifier is replaced with the host identifier. The storage allocation device according to any one of claims 1 to 4,
The storage allocation rule for a host set in advance is represented by a correspondence between a host that performs storage allocation and a virtual host on the assumption that storage is allocated to a virtual host in a storage router. Assignment device. At least one host connected to the IP network, a plurality of storages connected to the Fiber Channel network or the SCSI bus, and connected to both the IP network and the Fiber Channel network or the SCSI bus to set storage allocation to the host A storage allocation method in an iSCSI storage system comprising at least one storage router, establishing a session between a host and the storage router, and reading and writing data according to a SCSI protocol over TCP / IP,
Set the storage allocation for the virtual host in the storage router,
The storage router assigns any storage to the host by assigning any of the virtual hosts assigned to the arbitrary storage to the host to be logged in based on a preset storage allocation rule for the host. Storage allocation method to be used. At least one host connected to the IP network, a plurality of storages connected to the Fiber Channel network or the SCSI bus, and connected to both the IP network and the Fiber Channel network or the SCSI bus to set storage allocation to the host A storage allocation method in an iSCSI storage system comprising at least one storage router, establishing a session between a host and the storage router, and reading and writing data according to a SCSI protocol over TCP / IP,
Setting the storage allocation for the virtual host in the storage router;
A step in which the host logs in to the storage for the first time, or a step in which the host logs out of all the storages once and detects the establishment timing of the session in which the host logs in again;
Allocating any one of the virtual hosts allocated to any storage in the storage router to the host to be logged in, based on a preset storage allocation rule for the host when detecting the session establishment timing. A storage allocation method. The storage allocation method according to claim 7,
The session establishment detection step manages information on the session and the TCP connection between the host and the storage router, so that the host logs in to the storage for the first time, or the host logs out once from all the storages and then logs in to the storage again. A storage allocation method characterized by detecting the establishment timing of a session to be performed. The storage allocation method according to claim 7,
In the storage allocation step, upon detecting a session establishment timing, a host identifier capable of uniquely identifying a host in an iSCSI Protocol I Data Unit in an IP packet received from the host, based on a preset storage allocation rule for the host. Is replaced with a virtual host identifier that can uniquely identify any of the virtual hosts assigned to any storage in the storage router, and the virtual host identifier in the iSCSI Protocol I Data Unit in the IP packet received from the storage router is replaced by the host. A storage allocation method characterized by replacing an identifier. The storage allocation method according to any one of claims 6 to 9,
The storage allocation rule for a host set in advance is represented by a correspondence between a host that performs storage allocation and a virtual host on the assumption that storage is allocated to a virtual host in a storage router. Assignment method. At least one host connected to the IP network, a plurality of storages connected to the Fiber Channel network or the SCSI bus, and connected to both the IP network and the Fiber Channel network or the SCSI bus to set storage allocation to the host Program for realizing, on a computer, a storage allocating device in an iSCSI storage system that includes at least one storage router, establishes a session between a host and the storage router, and reads and writes data according to a SCSI protocol over TCP / IP And
The program is
A step in which the host logs in to the storage for the first time, or a step in which the host logs out of all the storages once and detects the establishment timing of the session in which the host logs in again;
Allocating any of the virtual hosts previously allocated to any storage in the storage router to the host to be logged in, based on a preset storage allocation rule for the host when detecting the session establishment timing. A storage allocation program to be executed. The storage allocation program according to claim 11,
The session establishment detection step manages information on the session and the TCP connection between the host and the storage router, so that the host logs in to the storage for the first time, or the host logs out once from all the storages and then logs in to the storage again. A storage allocation program for detecting the establishment timing of a session to be executed. The storage allocation program according to claim 11,
In the storage allocation step, upon detecting a session establishment timing, a host identifier capable of uniquely identifying a host in an iSCSI Protocol I Data Unit in an IP packet received from the host, based on a preset storage allocation rule for the host. Is replaced with a virtual host identifier that can uniquely identify any of the virtual hosts previously allocated to any storage in the storage router, and the virtual host identifier in the iSCSI Protocol I Data Unit in the IP packet received from the storage router is replaced with the virtual host identifier. A storage allocation program, wherein the storage identifier is replaced with the host identifier. The storage allocation program according to any one of claims 11 to 13,
The storage allocation rule for a host set in advance is represented by a correspondence between a host that performs storage allocation and a virtual host on the assumption that storage is allocated to a virtual host in a storage router. Assignment program. A computer-readable medium storing the storage allocation program according to any one of claims 11 to 14.

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