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RAID Controller PERC 4e dc - no battery

Posted on 2010-11-16
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Ok, I have a server that has a PERC 4e dc RAID controller, the memory module went bad so it has been replaced with standard memory with no battery.  Now when we boot the server up it says to disable write back mode.  What risks are we putting ourselves in ?
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Question by:redvipergts
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David earned 500 total points
ID: 34146837
This is a server, then just bite the bullet, and disable writeback (i.e, set to write-through).   You are risking:
- data loss in event of a power failure, disk failure, or even BSOD
- any rebuild operations will take much longer

Downside is that your writes will be slower, you'll notice it, I'm sure.  But data integrity is probably pretty important, so you just have to put it in write-through mode until new battery can be sourced.

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by:David
ID: 34146871
Note, since you have no way of protecting against BSOD, bad block(s), disk timeouts, or catastrophic failure, then this really is not an option for you to leave it in write-back mode.   If anybody in management complains about performance in interim, tell then the alternative is to risk data loss and corruption in event of one of these situations ... and if they tell you to do it anyway, then request they send it in email with audit trail.  If your data is medical, financial, i.e, stuff that HIPAA cares about, then they are asking you to break the law to knowingly put it at risk.
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