Fujitsu ETERNUS DX80 S2 User Manual page 101

Chapter 7 Troubleshooting
7.1 Check List
• Check the path status.
- When using the ETERNUS Multipath Driver, start ETERNUS Multipath Manager.
If an abnormality is detected in a path, refer to the ETERNUS Multipath Driver manuals and follow the
direction given in the manuals.
- When not using the ETERNUS Multipath Driver, use the path management tool and check the path
status that each software provides, and handle the problem if necessary.
• Check the loading of the ETERNUS DX Disk storage system. If the load is out of balance because of
operation content changing or for other reasons, review the configuration and settings.
• Check the transfer speed of the FC port.
If the transfer speed for the ETERNUS DX Disk storage system is different from the server or the FC switch,
set the same transfer speed as the server or FC switch.
• Check the number of command queues in the server.
When there are no problems in the process capacity of the server, adjust the number of command queues
so that the I/Os are issued for the appropriate number.
For details on the number of command queues, refer to "User's Guide -Server Connection-".
• Check the status of the RAID group.
When rebuild, copyback, or redundant copy is being performed in a RAID group with a "High" rebuild
priority, the performance may be reduced until the operation is complete.
• Check the cache parameter settings of the volumes.
If the Force Prefetch mode of the volumes that are used for image distribution is disabled, performance
may be reduced. Enable the Force Prefetch mode and specify the appropriate value for the Prefetch Limit.
Note that the Force Prefetch mode for volumes that are not used for image distribution must be disabled.
■ When the server does not recognize the volumes
Check the following points. If none of these resolve the problem, leave the ETERNUS DX Disk storage system
alone and contact your maintenance engineer.
• Check the status of the ETERNUS DX Disk storage system and other devices such as network devices
connecting the server and the ETERNUS DX Disk storage system, and ensure that there are no problems
with the power supply.
• Check if an error occurs in a path by using a path management tool such as ETERNUS Multipath Manager.
Refer to the relevant manuals and take the required actions.
ETERNUS DX80 S2/DX90 S2 Disk storage system User's Guide -Operation-
101
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