On 25/09/2012 12:14, keld@xxxxxxxxxx wrote: [...]
A mirrored raid should be able to still function also for writes, when this is still possible. A raid10,far with 4 disks should be able to function with 2 failed disks (in the best case). As long as all data is available and the 2 remaining functional disks are OK, they should be able to function fully normally. Of cause there needs to be warnings of the fact that 2 disks have failed. But it should not be recorded in the log for each write failed for the non-functioning disks.
Yes but in thise case, two adjacent devices have failed, so we cannot read from or write to a quarter of the array.
I think I agree that the OP's dd command, which would certainly have tried to write to an area of the array there was no backing store for, ought to have failed with an error message, and that the failure behaviour ought to be the same for f2 as it is for n2.
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