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Can one of the 1+1 Redundant Power Supplies in the S5000 Storage Device be Cut off?

Publication Date:  2012-07-18 Views:  88 Downloads:  0
Issue Description
A customer consulted whether one of the 1+1 redundant power supplies in the S5000 storage device could be cut off?
Alarm Information
None
Handling Process
When the two power modules of the S5000 device work normally, either of the power supplies can provide sufficient power to the whole S5000 device under rated voltage and current. Cutting off one of power supplies does not affect the running of the device.
You should understand the two cache write policies mentioned in "Possible causes".
Root Cause
The power supplies of the storage system are in 1+1 redundant design. Either of the power supplies can provide sufficient power to the whole S5000 device under standard voltage and current.
When only one power supply provides power to the storage system, to guarantee data storage security and ensure that cache data can be completely written to disks during a power failure, the cache write policy is automatically adjusted from write back to write through. Then data is directly written to disks but not to cache. However, the storage system performance deteriorates.
When two power supplies offer power at the same time, the cache write policy is automatically adjusted from write through to write back.
Suggestions
To protect the storage device and maintain its normal running, it is recommended to use two power supplies to provide power for the S5000.

END