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Dell PERC 6/i SAS T774H raid card, does it *need* a battery pack to function?

Posted on 2016-10-10
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Last Modified: 2016-12-08
Hello all,
I bought a Dell PERC 6/i T774H raid card, but it did not come with a battery pack. Is it necessary in order to use the card in general, or more just a good idea to have one?

Thanks!
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Question by:MostHated
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Casey Weaver earned 2000 total points
ID: 41837623
It doesn't have to have it, but because of risks, you'll have to override settings to make it use the card's cache. I also don't recommend any parity based raid like 5 or 6 without a battery as with a power failure or sudden shutdown the risk of parity data not getting written will be high. Parity raids without caching enabled will suffer huge write performance losses.
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by:MostHated
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Is it possible to get things setup and installed while I try and source a battery pack, and then plug it in once it arrives and retain everything I already had setup?
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by:Casey Weaver
Casey Weaver earned 2000 total points
ID: 41837629
Yes, and most cards the battery is even hot swappable. On some versions, write caching automatically enables itself in the presence of a battery, in other models, you go into the software and check some boxes to enable it after installing the battery.
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by:MostHated
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Much appreciated sir, and thank you for the quick replies. You have been a great help.
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by:Casey Weaver
ID: 41837633
http://public.support.unisys.com/pcproducts/esx/docs/delldocs5.4/en/perc6i_6e/chapterb.htm

In this document it appears the 6/i enables and disables caching in the presence of a battery. There is a force write back option without a battery, as the page explains.
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