Hi. What do you think about adding functionality similar to disk's spare sectors - if a sector die, a new one is assigned from the spare sectors pool. This will be very helpful especially for laptops, where you have only one disk. I simulated returning EIO for one sector from a one-disk pool and as you know system paniced:
panic: ZFS: I/O failure (write on <unknown> off 0: zio 0xc436d400 [L0 zvol object] 2000L/2000P DVA[0]=<0:4000:2000> fletcher2 uncompressed LE contiguous birth=11 fill=1 cksum=90519dcb617667ac:e96316f8a73d7efc:8ca812fc04509f9b:9b9632c6959cbd71): error 5 From what I saw, ZFS retried to write to this sector once again before panicing, but why not just try another block? And maybe remember the problematic block somewhere. Of course this won't safe us when read operation fails, but should work quite well for writes. Not sure how vdev_mirror works exactly, ie. if it needs both mirror components to be identical or if the only guaranty is that they have the same data, but not exactly in the same place. If the latter, proposed mechanism could be also used as a part of the self-healing process, I think. -- Pawel Jakub Dawidek http://www.wheel.pl [EMAIL PROTECTED] http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am!
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