Subject: Do I understand my RAID6 correctly? From: Stefan G. Weichinger <lists@xxxxxxxx> To: Yann Ormanns <yann-ormanns@xxxxxx> Date: 2011-04-12 11:11 (+0200) > Array Size : 4391334912 (4187.90 GiB 4496.73 GB) > Used Dev Size : 731889152 (697.98 GiB 749.45 GB) > Raid Devices : 8 > Total Devices : 9 > Preferred Minor : 3 > Persistence : Superblock is persistent > > Active Devices : 8 > Working Devices : 8 > Failed Devices : 1 You now have 9 devices in this Array (750GB*8 = 6 TB, 6 TB - (2*750GB) = 4.5 TB). One of them is the failed spare disk. That means, that this array can "lose" two disks without losing data, as you already wrote. Of course you can re-use /dev/sdk as a spare disk, but before, you should check, why it failed (SMART data for example). You should also have a look at the used drive models. E.g. if this array uses 9x model XYZ from manucaturer ABC, perhaps more drives will fail in the next time. If the array uses mixed models, it should not be THAT urgent - but that depends on the importance of the data... I've read several times of people losing their RAID6, because they did not mix the hard drive models. Then, a manufacturing fault have very bad consequences. Best regards, Yann -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
