16.2.4 Storage configuration

(1) Node-local file system

A node-local file system stores the following directories:

• Server directory

  To create a server directory, use the adbinstall command.

• DB directory

  For details about how to create the DB directory, see 16.3.8 Creating a database.

• Multi-node synonym dictionary storage directory

  For details about the multi-node synonym dictionary storage directory, see (6) Creating the multi-node synonym dictionary storage directory in 16.24.1 Preparing for synonym search operations.

• Audit trail directory

  For details about the audit trail directory, see 2.18.5 Output destination of audit trails (audit trail file).

• Output-directory for common format audit trails

  For details about the output-directory for common format audit trails, see 2.18.9 Conversion of audit trail information (linkage with JP1/Audit Management - Manager).

In Figure 16‒1: Example of a system configuration using the multi-node function, LOC001 to LOC003 are node-local file systems.

• LOC001

  Local file system of server machine hadb01 (master node)

• LOC002

  Local file system of server machine hadb02 (slave node)

• LOC003

  Local file system of server machine hadb03 (slave node)

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(2) File systems inherited at node switchover

Configure the following file systems as file systems inherited at node switchover:

• File system for the system directory which stores the content of ADBSYS under the DB directory

• File system that stores synonym dictionary files

Create these file systems inherited at node switchover on an LV in a VG that consists of disks (shared disks) that can be referenced from all nodes. For details about shared disks, see Shared disk configuration in the manual HA Monitor for Linux^(R) (x86).

In Figure 16‒1: Example of a system configuration using the multi-node function, FS001 and FS002 are the file systems inherited at node switchover.

• FS001

  File system for the system directory

  Here, the name of the VG is vg_hadb, and the name of the LV is hadb_sys.

• FS002

  File system that stores synonym dictionary files

  In this example, the name of the VG is vg_hadb02, and the name of the LV is hadb_syndict. If you do not intend to conduct synonym searches, the file system that stores synonym dictionary files is not required.

Important

When using SCSI reservation for shared disk, configure the disks where the file systems inherited at node switchover are created as subject to SCSI reservation. On disks subject to SCSI reservation, do not create any areas other than file systems inherited at node switchover.

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(3) Disks for DB area files

Provide a disk for each DB area file.

For the DB area files listed below, allocate a block special file. Also, make sure that disks that correspond to block special files can be referenced from all nodes.

• Master directory DB area file

• Dictionary DB area file

• System-table DB area file

• Data DB area file

Important

When using SCSI reservation for shared disk, configure the disks that store the preceding DB area files as subject to SCSI reservation.

Provide the disk that is used by the following DB area file on each node:

• Work table DB area file

Important

• If a disk that needs to be prepared for each node (disk to store the work table DB area files) is shared and used by multiple nodes, operations are not guaranteed. Incorrect retrieval results might be displayed, or the HADB server might terminate abnormally.

• When using SCSI reservation for shared disk, do not configure the disks on which work table DB area files are stored as subject to SCSI reservation.

In Figure 16‒1: Example of a system configuration using the multi-node function, LU001 to LU005 and WRK001 to WRK003 are the disks for DB area files.

• LU001

  DB area disk that comprises a dictionary DB area

• LU002

  DB area disk that comprises a master directory DB area

• LU003

  DB area disk that comprises a system-table DB area

• LU004

  DB area disk that comprises a data DB area (ADBUTBL01)

• LU005

  DB area disk that comprises a data DB area (ADBUIDX01)

• WRK001

  DB area disk that comprises the work table DB area of the HADB server on server machine hadb01 (master node)

  This is a node-local disk. The name of the corresponding block special file is set to /dev/mapper/WRK001.

• WRK002

  DB area disk that comprises the work table DB area of the HADB server on server machine hadb02 (slave node)

  This is a node-local disk. The name of the corresponding block special file is set to /dev/mapper/WRK002.

• WRK003

  DB area disk that comprises the work table DB area of the HADB server on server machine hadb03 (slave node)

  This is a node-local disk. The name of the corresponding block special file is set to /dev/mapper/WRK003.

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