Date: Thu, 14 May 2015 15:42:07 +0200 From: Gabor Radnai <gabor.radnai@gmail.com> To: freebsd-fs@freebsd.org Subject: Re: ZFS RAID 10 capacity expansion and uneven data distribution Message-ID: <CABnVG=cc_7UNMO=XUFq4esPDZyZO8wDXhfXnA4tXSu77raK42Q@mail.gmail.com>
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Hi Kai, As others pointed out the cleanest way is to destroy / recreate your pool from backup. Though if you have no backup a hackish, in-place recreation process can be the following. But please be *WARNED* it is your data, the recommended solution is to use backup, if you follow below process it is your call - it may work but I cannot guarantee. You can have power outage, disk outage, sky falling down, whatever and you may lose your data. And this may not even work - more skilled readers could bit me on head how stupid this is. So, again be warned. If you are still interested: > On one server I am currently using a four disk RAID 10 zpool: > > zpool ONLINE 0 0 0 > mirror-0 ONLINE 0 0 0 > gpt/zpool-da2 ONLINE 0 0 0 > gpt/zpool-da3 ONLINE 0 0 0 > mirror-1 ONLINE 0 0 0 > gpt/zpool-da4 ONLINE 0 0 0 > gpt/zpool-da5 ONLINE 0 0 0 1. zpool split zpool zpool.old this will leave your current zpool composed from slice of da2 and da4, and create a new pool from da3 and da5. 2. zpool destroy zpool 3. truncate -s <proper size> /tmp/dummy.1 && truncate -s <proper size> /tmp/dummy.2 4. zpool create <flags> zpool mirror da2 /tmp/dummy.1 mirror da4 /tmp/dummy.2 5. zpool zpool offline /tmp/dummy.1 & zpool offline /tmp/dummy.2 6. zpool import zpool.old 7. (zfs create ... on zpool as needed) copy your stuff from zpool.old to zpool 8. cross your fingers, *no* return from here !! 9. zpool destroy zpool.old 10. zpool labelclear da3 && zpool labelclear da5 # just to be on clear side 11. zpool replace zpool /tmp/dummy.1 da3 && zpool replace zpool /tmp/dummy.2 da5 12. wait for resilver ... If this is total sh*t please ignore, i tried it in VM seemed to work. Thanks.
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