On Thu, Aug 13, 2009 at 9:59 AM, Micha Silver <mi...@arava.co.il> wrote:
> We suffered some annoying file and directory corruption on a CentOS 5.3 64 > bit server two days ago after a long power failure - long enough to drain > the UPS battery, with several short "spurts" of power until it finally > stabilized. Files appeared as directories, directories turned into files, > duplicated inodes, in short, a mess. And most of the corruption was under > /usr, i.e. *not* files that were being written to when the power went off. > The file system is ext3 but the journaling didn't help - well maybe it did, > but not enough... > > > The machine is a Dell PE 840 with their PERC 5i controller and 4 SATA disks > in a RAID 5 array. It has its own battery backup to preserve the writeback > cache in case of power failure (but again the files that got "kevorked" were > not being written...). And it's relatively new ( < 2 yrs). Two identical > machine attached to the same UPS, but w/o RAID came thru the event with no > problems. And other, older servers with SCSI disks also showed no ill > effects. > > Does anyone have any ideas how to prevent this kind of thing in the future? > (short of adding lots of additional batteries) > Sample the UPS unit for "how much battery time left do you have?" and initiate automatic shutdown when the number falls below the 5 minutes threshold ? -- Shimi
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