Resend...
On 10/11/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > On 10/11/07, P.V.Anthony <[EMAIL PROTECTED]> wrote: > > > On this day, 11-October-2007 10:06 AM, [EMAIL PROTECTED] wrote: > > > > > > If you had a RAID5 array with 3 drives, and one of them crashed, you > > > should be able to continue using the array in a degraded mode with > > just > > > 2 drives. Once you have a replacement drive, you should be able to > > > rebuild the array by using your usual software raid management tools > > > (eg. mdadm). > > > > In total there are 15 drives. One drive was marked as faulty. I just > > re-added it back into the array. > > > > Then it was syncing. Then another drive was marked faulty. > > > > Now all the drives are marked as spare. > > > If 2 drives have failed, you're pretty much out of luck using standard > tools. Even if you could cobble together some specialist software to read > what is left of the array, you'd have gaps of missing data blocks. > > Depending on how the failed drives failed, you may wish to try to > resuscitate them instead. If the failed disks are still detectable by the > controller, you can try using dd_rescue and dd_rhelp on a separate system or > a livecd to recover as much as possible to spare disks, and using the spare > disks in place of the failed disks.. You may also have some luck by going > to a data recovery company. > > I think the best practice is to use no more than 6-8 drives in a single > raid5 array, to control the risk of 2 drives failing before recovery can > happen. Sorry to be telling you this after disaster struck. >
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