On Mon, Apr 23, 2012 at 02:16:40PM +1200, Ian Collins wrote: > If it were my data, I'd set the pool read only, backup, rebuild and > restore. You do risk further data loss (maybe even pool loss) while the > new drive is resilvering.
You're definitely in a pickle. The first priority is to try and ensure that no further damage is done. Check and make sure you have ample power supply. Setting the pool readonly would be a good start. Powering down and checking all the connectors and cables would be another. Write errors are an interesting result. Check the smart data on that disk - either it is totally out of sectors to reallocate, or it has some kind of interface problem. If you can, image all the disks elsewhere, with something like ddrescue. Doing so sequentially rather than random IO through the filesystem can sometimes have better results for marginal disks/sectors. That gives you scratch copies to work on or fall back to, as you try other recovery methods. zfs15 is fairly old.. Consider presenting a copy of the pool to a newer solaris that may have more robust recovery, as one experiment. I wouldn't "zpool replace" anything at this point - the moment you do, you throw away any of the good data on that disk, which might help you recover sectors that are bad on other disks. If you have to swap disks, I would try and get as many of the readable sectors copied across to the new disk as possible (ddrescue again) with the pool offline, and then just physically swap disks, so at least the good data remains usable. Try and get some clarity on what's happening with the hardware on a individual disk level - what reads successfully (at least at the physical layer, below zfs chksum). Try and get at the root cause of the write errors first; they're impeding zfs's recovery of what looks like other > I would only use raidz for unimportant data, or for a copy of data from > a more robust pool. Well, yeah, but a systemic problem (like bad ram or power or controller) can manifest as a multi-disk failure no matter how many redundant disks. -- Dan.
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