Date: Mon, 28 Jan 2013 09:58:20 +0100 From: Ulrich =?utf-8?B?U3DDtnJsZWlu?= <uqs@FreeBSD.org> To: Peter Jeremy <peter@rulingia.com> Cc: current@freebsd.org, fs@freebsd.org Subject: Re: Zpool surgery Message-ID: <20130128085820.GR35868@acme.spoerlein.net> In-Reply-To: <20130127201140.GD29105@server.rulingia.com> References: <20130127103612.GB38645@acme.spoerlein.net> <1F0546C4D94D4CCE9F6BB4C8FA19FFF2@multiplay.co.uk> <20130127201140.GD29105@server.rulingia.com>
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On Mon, 2013-01-28 at 07:11:40 +1100, Peter Jeremy wrote:
> On 2013-Jan-27 14:31:56 -0000, Steven Hartland <killing@multiplay.co.uk> wrote:
> >----- Original Message -----
> >From: "Ulrich Spörlein" <uqs@FreeBSD.org>
> >> I want to transplant my old zpool tank from a 1TB drive to a new 2TB
> >> drive, but *not* use dd(1) or any other cloning mechanism, as the pool
> >> was very full very often and is surely severely fragmented.
> >
> >Cant you just drop the disk in the original machine, set it as a mirror
> >then once the mirror process has completed break the mirror and remove
> >the 1TB disk.
>
> That will replicate any fragmentation as well. "zfs send | zfs recv"
> is the only (current) way to defragment a ZFS pool.
But are you then also supposed to be able send incremental snapshots to
a third pool from the pool that you just cloned?
I did the zpool replace now over night, and it did not remove the old
device yet, as it found cksum errors on the pool:
root@coyote:~# zpool status -v
pool: tank
state: ONLINE
status: One or more devices has experienced an error resulting in data
corruption. Applications may be affected.
action: Restore the file in question if possible. Otherwise restore the
entire pool from backup.
see: http://illumos.org/msg/ZFS-8000-8A
scan: resilvered 873G in 11h33m with 24 errors on Mon Jan 28 09:45:32 2013
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 27
replacing-0 ONLINE 0 0 61
da0.eli ONLINE 0 0 61
ada1.eli ONLINE 0 0 61
errors: Permanent errors have been detected in the following files:
tank/src@2013-01-17:/.svn/pristine/8e/8ed35772a38e0fec00bc1cbc2f05480f4fd4759b.svn-base
tank/src@2013-01-17:/.svn/pristine/4f/4febd82f50bd408f958d4412ceea50cef48fe8f7.svn-base
tank/src@2013-01-17:/sys/dev/mvs/mvs_soc.c
tank/src@2013-01-17:/secure/usr.bin/openssl/man/pkcs8.1
tank/src@2013-01-17:/.svn/pristine/ab/ab1efecf2c0a8f67162b2ed760772337017c5a64.svn-base
tank/src@2013-01-17:/.svn/pristine/90/907580a473b00f09b01815a52251fbdc3e34e8f6.svn-base
tank/src@2013-01-17:/sys/dev/agp/agpreg.h
tank/src@2013-01-17:/sys/dev/isci/scil/scic_sds_remote_node_context.h
tank/src@2013-01-17:/.svn/pristine/a8/a8dfc65edca368c5d2af3d655859f25150795bc5.svn-base
tank/src@2013-01-17:/contrib/llvm/utils/TableGen/DAGISelMatcher.cpp
tank/src@2013-01-17:/contrib/tcpdump/print-babel.c
tank/src@2013-01-17:/.svn/pristine/30/30ef0f53aa09a5185f55f4ecac842dbc13dab8fd.svn-base
tank/src@2013-01-17:/.svn/pristine/cb/cb32411a6873621a449b24d9127305b2ee6630e9.svn-base
tank/src@2013-01-17:/.svn/pristine/03/030d211b1e95f703f9a61201eed63efdbb8e41c0.svn-base
tank/src@2013-01-17:/.svn/pristine/27/27f1181d33434a72308de165c04202b6159d6ac2.svn-base
tank/src@2013-01-17:/lib/libpam/modules/pam_exec/pam_exec.c
tank/src@2013-01-17:/contrib/llvm/include/llvm/PassSupport.h
tank/src@2013-01-17:/.svn/pristine/90/90f818b5f897f26c7b301c1ac2d0ce0d3eaef28d.svn-base
tank/src@2013-01-17:/sys/vm/vm_pager.c
tank/src@2013-01-17:/.svn/pristine/5e/5e9331052e8c2e0fa5fd8c74c4edb04058e3b95f.svn-base
tank/src@2013-01-17:/.svn/pristine/1d/1d5d6e75cfb77e48e4711ddd10148986392c4fae.svn-base
tank/src@2013-01-17:/.svn/pristine/c5/c55e964c62ed759089c4bf5e49adf6e49eb59108.svn-base
tank/src@2013-01-17:/crypto/openssl/crypto/cms/cms_lcl.h
tank/ncvs@2013-01-17:/ports/textproc/uncrustify/distinfo,v
Interestingly, these only seem to affect the snapshot, and I'm now
wondering if that is the problem why the backup pool did not accept the
next incremental snapshot from the new pool.
How does the receiving pool known that it has the correct snapshot to
store an incremental one anyway? Is there a toplevel checksum, like for
git commits? How can I display and compare that?
Cheers,
Uli
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