Fujitsu ETERNUS DX100 S4 Basic Operation Manual page 117

Chapter 7 Troubleshooting
7.1 Check List
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When I/O Access Is Slow
Check the points that are shown below. When the cause is not identified, contact your maintenance engi-
neer.
Check the battery status of the ETERNUS DX100 S4/DX200 S4 by using ETERNUS Web GUI. If the battery
•
charge rate is low or if the replacement time for a battery has passed, the performance of the ETERNUS DX
degrades because the operational state of the cache is changed to Write Through mode.
If the replacement time for a battery has passed, contact your maintenance engineer.
Check that the ambient temperature does not exceed the operating environment conditions.
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If the ambient temperature exceeds the operating environment conditions, Nearline SAS disk performance
may be reduced.
Click the icon of each part on the [Storage] screen of [Component] of ETERNUS Web GUI to check if an ab-
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normality is detected in ETERNUS DX parts.
If an abnormality is detected, contact your maintenance engineer.
Check the path status.
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If the ETERNUS Multipath Driver is used, start ETERNUS Multipath Manager.
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If an abnormality is detected in a path, refer to the ETERNUS Multipath Driver manuals and follow the
direction given in the manuals.
If the ETERNUS Multipath Driver is not used, check the path status by using the path management tool
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that each software provides and handle any problems as required.
• Check the loading of the ETERNUS DX. If the load is out of balance because of operation content changing
or for other reasons, review the configuration and settings.
• Check the transfer rate of the FC port.
If the transfer rate for the ETERNUS DX is different from the server or the FC switch, set the same transfer
rate as the server or FC switch.
Check the number of command queues in the server.
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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 "Configuration Guide -Server Connection-".
Check the message log of the OS on the server that is connected and then take the appropriate actions.
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• Check the status of the RAID group.
When rebuild/copyback or redundant copy is being performed in a RAID group with a "High" rebuild priori-
ty, the performance may be reduced until the operation is complete.
Check the cache parameter settings of the volumes.
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The performance may be reduced when multiple sequential read accesses simultaneously occur for vol-
umes that do not have the Force Prefetch mode enabled. Enable the Force Prefetch mode and specify the
appropriate value for the Prefetch Limit.
This may be caused by accesses that are used for video distribution businesses.
FUJITSU Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Operation Guide (Basic)
117
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