On Mon, Jan 02, 2012 at 06:30:14PM -0800, [email protected] spake thusly: > the one thing that's key about hardware raid vs software raid is > that good hardware raid cards have battery backed cache on the card.
Yes, I do agree that is one of the good things about battery backed RAID cards. Although it won't save what is in the system disk cache it should help ensure (but still won't guarantee, it seems) that whatever the disk system said was committed really has been or will be committed so write barriers and journal guarantees are more likely to be honored. I currently ensure that my software RAID disk systems are on UPS power although I wish it were possible to have per-system UPS batteries like what Google does so that a UPS failure doesn't take out a bunch of systems. Although last year I did have some corruption because a hardware RAID card itself (with battery) seized up. -- Tracy Reed http://tracyreed.org Digital signature attached for your safety.
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