Date: Fri, 2 Feb 2018 23:34:10 +0100 From: Ben RUBSON <ben.rubson@gmail.com> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS pool faulted (corrupt metadata) but the disk data appears ok... Message-ID: <42C31457-1A84-4CCA-BF14-357F1F3177DA@gmail.com> In-Reply-To: <027070fb-f7b5-3862-3a52-c0f280ab46d1@sorbs.net> References: <54D3E9F6.20702@sorbs.net> <54D41608.50306@delphij.net> <54D41AAA.6070303@sorbs.net> <54D41C52.1020003@delphij.net> <54D424F0.9080301@sorbs.net> <54D47F94.9020404@freebsd.org> <54D4A552.7050502@sorbs.net> <54D4BB5A.30409@freebsd.org> <54D8B3D8.6000804@sorbs.net> <54D8CECE.60909@freebsd.org> <54D8D4A1.9090106@sorbs.net> <54D8D5DE.4040906@sentex.net> <54D8D92C.6030705@sorbs.net> <54D8E189.40201@sorbs.net> <54D924DD.4000205@sorbs.net> <54DCAC29.8000301@sorbs.net> <9c995251-45f1-cf27-c4c8-30a4bd0f163c@sorbs.net> <8282375D-5DDC-4294-A69C-03E9450D9575@gmail.com> <73dd7026-534e-7212-a037-0cbf62a61acd@sorbs.net> <FAB7C3BA-057F-4AB4-96E1-5C3208BABBA7@gmail.com> <027070fb-f7b5-3862-3a52-c0f280ab46d1@sorbs.net>
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On 02 Feb 2018 21:48, Michelle Sullivan wrote: > Ben RUBSON wrote: > >> So disks died because of the carrier, as I assume the second unscathed >> server was OK... > > Pretty much. > >> Heads must have scratched the platters, but they should have been >> parked, so... Really strange. > > You'd have thought... though 2 of the drives look like it was wear and > wear issues (the 2 not showing red lights) just not picked up on the > periodic scrub.... Could be that the recovery showed that one up... you > know - how you can have an array working fine, but one disk dies then > others fail during the rebuild because of the extra workload. Yes... To try to mitigate this, when I add a new vdev to a pool, I spread the new disks I have among the existing vdevs, and construct the new vdev with the remaining new disk(s) + other disks retrieved from the other vdevs. Thus, when possible, avoiding vdevs with all disks at the same runtime. However I only use mirrors, applying this with raid-Z could be a little bit more tricky... Ben
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