JP2000099278A - Constitution definition system for array disk drive mounted with scsi interface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method for flexibly and easily setting a SCSI ID and an LUN according to the use environment of a device and as a user intends so that a SCSI connection between a host computer and a volume defined in logical units in the array disk drive mounted with the SCSI interface(small computer system interface). SOLUTION: Settings are made by using a setting screen so as to flexibly and easily define the access path between the host and logical volume. A connection port for connecting the host is selected 101 and for the port, a SCSI ID, an LUN, and a logical volume are selected 106. More than one SCSI ID can be set virtually for one connection port (SCSI device). An alternative path for a case of trouble and a path by volume capacity specification can automatically be set (102 and 103) and a great number of paths can easily be set through a small number of simple input operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration definition method for an array disk device having a SCSI interface and operating by connecting a plurality of magnetic disk devices.

[0002]

2. Description of the Related Art For a large-capacity array disk device having a very large number of volumes defined in logical units, the host computer must make a SCSI connection to all the volumes, depending on the environment in which the device is used and the intention of the user. Although it is possible to flexibly and easily select a connection port, SCSI ID, LUN, and target volume, and set and change a logical path, it is not possible to set an alternate path at the same time as setting a normally used logical path. It was impossible. Also, S
The determination of the CSI ID and LUN requires knowledge of the SCSI standard, and it has not been possible to set a logical path only by simple input without specifying these.

[0003]

An object of the present invention is to simplify the setting operation in response to an increase in the number of logical paths and alternative paths accompanying an increase in the capacity of an array disk device.

[0004]

In order to solve the above-mentioned problems, in an array disk device equipped with a SCSI interface, the number of SCSI devices of the array disk device, that is, the number of connection ports is k, the number of SCSI IDs and the number of LUNs of the SCSI interface to be applied. To m and n respectively
In order to make it possible to set a logical path to a maximum of k × (m−1) × n logical volumes according to the use environment and application, a maximum of (m−1) is set for one SCSI device.
SCSI IDs are virtually allocated, and each S
A means for arbitrarily selecting LUNs and logical volumes identified by LUNs under the CSI ID is referred to as a service processor (hereinafter, referred to as an SV) for performing configuration setting work and maintenance work.
This is realized as one of the functions of P).

For this means, it is possible to simultaneously set a normally used logical path and an alternative path. Further, it is possible to set a logical path with a few simple inputs.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the present invention, a dual array disk drive 20 having a SCSI interface mounted thereon is provided.
8 was applied. FIG. 2 is a hardware configuration diagram of the array disk device. Host computer 201
To the host I /
F control unit 202, and issues a command from the host to the host I
/ F control unit 202 analyzes common bus 2 and Dis
Access the Disk device via the k I / F control unit 204. The configuration set by the SVP 205 is
6 is stored. Embodiments will be described below with reference to the drawings.

[0007] As shown in FIG.
2, (m-1) SCSI IDs 40
4 can be flexibly and easily allocated according to the usage environment of the apparatus and the intention of the user, thereby greatly increasing the number of logical paths that can be set. Thereby, the host I / F control unit 20 which is one SCSI device as shown in FIG.
Thus, it is possible to set a logical path that is substantially (m-1) times as large as the case where one SCSI ID 404 is assigned to 2, and all the logical volumes of the array disk device can be used up. That is, a large capacity can be realized.

FIG. 6 shows an embodiment of a setting screen for setting the above logical path. The physical setting operation is only the operation of connecting the SCSI interface cable between the host and the array disk device.
Setting of ID, LUN and logical volume can all be executed on this screen.

In this setting screen, the connection port selection unit 6
In 03, an identification ID of a connection port which is a connection port with a host mounted on the disk array device is displayed. This is the SCSI device. SCSI ID selection unit 604
And the LUN selection unit 605 includes a SCSI ID and a LUN that meet the specifications of the SCSI interface to be applied.
Is displayed. The logical volume selection unit 606 displays an ID for identifying the volume of the defined logical unit.

Hereinafter, a setting method will be described. First, a basic logical path and an alternative path setting method will be described, and second, a simple setting method with few inputs will be described.

The first setting method is as follows. The connection port selection unit 603 selects one or more identification IDs of the connection ports for connecting the host. SCSI I
From the D selection unit 604, the maximum SCSI ID to be assigned to the connection port selected by the connection port selection unit 603 (m
-1) Select one. From the LUN selection unit 605, the SCS
For the SCSI ID selected by the I ID selection unit 604, one or more LUNs for identifying a logical volume to be allocated are selected. The logical volume selection unit 606 selects one or a plurality of logical volumes for which a logical path is to be defined. Finally, by selecting the [Set ...] button 607, the logical path between the host and the logical volume is set. For example, when each selection item is selected 302 as shown in FIG. 6, a logical path 701 as shown in FIG. 7 is defined. One line represents one logical path. This is the definition of a basic logical path.

In the examples shown in FIGS. 6 and 7, a logical path is set for a volume that follows the selected logical volume and continues to the selected logical volume. Further, it is also possible to set a logical path by selecting all the logical volumes from the volume selection unit 606 according to the environment in which the apparatus is used and the intention of the user. In this case, the number of logical volumes to be selected is the product of the number of selected SCSI IDs and the number of LUNs.

In contrast to this setting method, when a failure occurs in one normally used connection port, an alternative path for enabling access to the volume using the alternative port on the other side is provided. It can be set at the same time as the setting of the logical path used normally. In FIG. 6, by simply selecting the alternative path automatic generation 601, a host connected to the selected connection port is identified from the host identification information 305.
It is possible to set an alternative path for an alternative port according to the type of host to be connected. For example, it is possible to set the alternative path 801 as shown in FIG. 8 simultaneously with the setting of the logical path 701 shown in FIGS. This means that an even number is assigned to the SCSI ID of the normally used logical path, and 1 is assigned to the SCSI ID of the normal logical path as the SCSI ID of the alternative path.
Is an example of a setting based on the specification of the host in which the same is assigned to the normal logical path and the alternate path for the LUN.

It is also possible to set only an alternative path. FIG.
Then, when the alternative path automatic generation 601 and the connection port are selected, the alternative path is automatically generated based on the logical path already existing at the selected connection port.

FIG. 9 shows a screen for setting information for identifying the host connected to the connection port. Connection port selector 9
In 02, an identification ID of a connection port which is a connection port with a host mounted on the disk array device is displayed. The host ID selection unit 901 displays a host ID uniquely assigned to the host. Select which host to assign to which connection port, and click the [Set ...] button 9
By selecting 03, it is possible to set host identification information 305, which is information for identifying a host.

The second setting method is as follows. In order to simplify the setting operation of the user, the logical path can be set only by specifying the volume capacity required by the host connected to the selected connection port. In FIG. 6, by selecting the volume capacity designation 602 and inputting the capacity, a combination of logical volumes for which no logical path is defined is generated from the input capacity based on the capacity defined for the logical volume. The definition 304 of the existing logical path set to the selected connection port for the volume
Unused SCSI IDs and LUNs are searched and assigned in ascending order so as not to overlap with
A logical path can be set without selecting an ID and a LUN. The capacity defined for the logical volume can be obtained from the volume definition information 306 in FIG.

In FIG. 6, when two alternative paths, ie, an automatic path creation 601 and a volume capacity designation 602, are selected at the same time, the SCSI ID and LUN are automatically set only by selecting the connection port normally used and inputting the required volume capacity. And an alternative logical path can be set. This not only greatly reduces the user's setting operation, but also can reduce incorrect setting of the logical path.

From the above features, it is possible to easily set a logical path even if the user is not familiar with the configuration of the device or the SCSI standard.

Using the logical path and the alternative path defined by the present method, the host (Initiat)
or), SCSI ID (Target ID) and LUN
The target volume is accessed by the set (ITL). The volume to be accessed is determined by a microprogram incorporated in the connection port. This gives 1
The connection port, which is one SCSI device, is connected to the SCSI device having SCSI ID = 0 according to the ITL.
It can be a SCSI device with SI ID = 1, and can behave like a maximum of (m-1) SCSI devices.

Information on the logical path and the alternative path is managed in a three-dimensional array consisting of connection ports, SCSI IDs, and LUNs. By storing the ID of the target volume in a three-dimensional space determined by the connection port, the SCSI ID, and the LUN, the number of connection ports can be changed (specification of hardware of the device), and the SCSI ID and LUN can be changed (SCS).
(Specification change of the I standard). Even when the host is exchanged, since the information of the logical path and the alternative path is managed in this three-dimensional array, reset the ID for identifying the host, and if necessary, reset the alternative path. As a result, the logical volume can be immediately accessed.

The present method is one program executed on the SVP 205, and is executed by using the program stored in the FD 307 storage medium shown in FIG.
It is possible to load to P.

[0022]

According to the present invention, the setting of a logical path between an array disk device having an extremely large number of volumes defined in a logical unit and a host can be performed in a form according to the use environment of the device and the intention of the user. It can be performed flexibly and easily.

[Brief description of the drawings]

FIG. 1 is a logical path setting flow for implementing an embodiment.

FIG. 2 is a hardware configuration of an array disk device.

FIG. 3 is a software configuration of an SVP for implementing the embodiment.

FIG. 4 is a connection form of a device equipped with a SCSI interface according to the present invention. However, if the number of SCSI IDs is 15, L
The case where the number of UNs is 8 is shown.

FIG. 5 shows a connection form of a conventional device equipped with a SCSI interface.

FIG. 6 is a setting screen (logical path) for implementing the embodiment.
It is.

FIG. 7 is a screen for confirming the setting of a logical path executed according to the embodiment.

FIG. 8 is a screen for confirming the setting of an alternative path performed according to the embodiment.

FIG. 9 is a setting screen (connection host identification ID) for implementing the embodiment.

[Explanation of symbols]

101: Step of selecting a connection port 102: Step of selecting whether to automatically generate an alternative logical path 103: Step of specifying capacity and selecting whether to automatically assign SCSI ID and LUN 104: Required logic Step of calculating the number of volumes 105 Step of searching for a pair of unused SCSI IDs and LUNs 106 Step of selecting SCSI IDs and LUNs 107 Step of setting a normal logical path 108 Step of identifying a host 109 ... Steps to automatically generate an alternative path according to the connection host

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yutaka Nabekura 2880 Kozu, Odawara-shi, Kanagawa Prefecture Storage Systems Division, Hitachi, Ltd. (72) Inventor Takanao Kobayashi 6-81 Onoecho, Naka-ku, Yokohama-shi, Kanagawa F-term of Hitachi Software Engineering Co., Ltd. (reference) 5B014 HA11 5B065 BA01 CA30 CC10 EA31

Claims (3)

[Claims] A logical controller defined in a plurality of magnetic disk drive groups for a main control device connected to a host computer (hereinafter referred to as a host) and an array disk drive operating by integrating a plurality of magnetic disk drives. In order to connect a unit volume (hereinafter, logical volume) as an access target and connect a host according to the environment using the device or the user's intention, a SCSI device (hereinafter, connection port), S
CSI ID, LUN (Logical Unit Nu)
mber) and a logical volume, and a path from the host to the logical volume (hereinafter, logical path)
In the configuration definition method, the setting of the logical path from the logical path set on one side to the alternate connection port on the other side of the duplexed array disk device (hereinafter, alternate path) is automatically performed for the duplicated array disk device. A configuration definition method characterized by allowing a user to select whether or not to perform the operation in a specific manner. 2. When the automatic setting is selected in the method according to claim 1, for a duplicated array disk device, a logical path set to a connection port on one side is changed to an alternative connection port on the other side. When setting an alternate path,
By identifying the type of host, an alternative connection port is selected for a specific host without requiring user input operation, and the SCSI ID is set to the S of the logical path on one side.
The CSI ID plus 1 and the LUN are the same as the LUN of the logical path on one side. For the other hosts, both the SCSI ID and the LUN are the same as the logical path on the one side. A configuration definition method characterized by setting 3. The system according to claim 1, wherein instead of selecting a connection port, SCSI ID, LUN, and logical volume, only the capacity of a magnetic disk required by a host connecting a user input to the connection port. A combination of unused logical volumes is generated from the input capacity based on the capacity defined for the logical volume, and unused so that there is no overlap with the existing logical path set for the selected connection port A SCSI ID and LUN are searched in ascending order, and a logical path is set without allowing the user to select the SCSI ID and LUN.