Date: Sat, 15 Jul 2017 16:52:58 +0300 From: Volodymyr Kostyrko <arcade@b1t.name> To: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: How can I recover data from a faulted pool? Message-ID: <b7c3f089-963d-a23a-7bbe-ab1a450acd27@b1t.name> In-Reply-To: <7e3d874e-e051-1169-2111-b8f2549f89ee@webmail.sub.ru> References: <7e3d874e-e051-1169-2111-b8f2549f89ee@webmail.sub.ru>
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=D0=90=D0=BB=D0=B5=D0=BA=D1=81=D0=B0=D0=BD=D0=B4=D1=80 =D0=9F=D0=BE=D0=B2= =D0=BE=D0=BB=D0=BE=D1=86=D0=BA=D0=B8=D0=B9 wrote: > Hello > > FreeBSD 10.3. ZFS. > > # zpool status > pool: database > state: UNAVAIL > status: One or more devices are faulted in response to persistent > errors. There are insufficient replicas for the pool to > continue functioning. > action: Destroy and re-create the pool from a backup source. Manually > marking the device > repaired using 'zpool clear' may allow some data to be recovere= d. > scan: none requested > config: > > NAME STATE READ WRITE CKSUM > database UNAVAIL 0 0 0 > mirror-0 UNAVAIL 0 0 0 > gpt/database0 FAULTED 0 0 0 too many errors > gpt/database1 FAULTED 0 0 0 too many errors > > disks can be read, can I somehow recover data from the pool? For sure... First please describe what happened to both disks and what=20 hardware you were using (chipset/controller). Please don't try to `zpool = clear` yet. 1. ZFS *HEAVILY* relies on hardware to be stable, any hardware glitches=20 may result in severe pool corruption. If you have any doubts in hardware = first move the disks to the trusted box. 2. I assume both mirror parts were on different disks? ZFS doesn't like=20 pools that have more then one chunk on any drive. 3. Try mounting pool R/O with transaction recovery. While this is mirror = please do this for both disks and give it another try for single disks=20 as results may differ: `zpool import -N -O readonly=3Don -f -R /mnt/somezpoool =E2=80=A6` You can use mfsBSD for that. If that doesn't help try: `zpool import -N -O readonly=3Don -f -R /mnt/somezpoool -Fn =E2=80=A6` Both commands will try to import the pool without mounting file systems=20 in r/o mode. If that would work, try mounting only required filesystem=20 and copy some data from it. Please post your results. --=20 Sphinx of black quartz judge my vow.
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