Date: Wed, 20 Oct 2010 08:54:08 -0400 From: "Dan Langille" <dan@langille.org> To: "Ruben de Groot" <mail25@bzerk.org> Cc: freebsd-stable@freebsd.org Subject: Re: 'zfs send -i': destination has been modified Message-ID: <40c67a2c91813d90fa4a3dafb8604db1.squirrel@nyi.unixathome.org> In-Reply-To: <20101020124434.GA41365@ei.bzerk.org> References: <c00184baaf75b1e64e625a0b9dfb97b4.squirrel@nyi.unixathome.org> <20101020124434.GA41365@ei.bzerk.org>
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On Wed, October 20, 2010 8:44 am, Ruben de Groot wrote: > On Wed, Oct 20, 2010 at 08:32:33AM -0400, Dan Langille typed: >> I am trying to do a 'zfs send -i' and failing. >> >> This is my simple proof of concept test: >> >> Create the data >> # zfs create storage/a >> # touch /storage/a/1 >> # touch /storage/a/2 >> # touch /storage/a/3 >> >> Snapshot >> # zfs snapshot storage/a@2010.10.19 >> >> send >> # zfs send storage/a@2010.10.19 | zfs receive -v storage/compressed/a >> receiving full stream of storage/a@2010.10.19 into >> storage/compressed/a@2010.10.19 >> received 252KB stream in 2 seconds (126KB/sec) >> # >> >> >> >> Create one more file and snapshot that >> >> # touch /storage/a/4 >> # zfs snapshot storage/a@2010.10.20 >> >> >> send it >> >> # zfs send -i storage/a@2010.10.19 storage/a@2010.10.20 | zfs receive >> -v >> storage/compressed/a >> receiving incremental stream of storage/a@2010.10.20 into >> storage/compressed/a@2010.10.20 >> received 250KB stream in 3 seconds (83.4KB/sec) >> >> What do we have? >> >> # find /storage/compressed/a >> /storage/compressed/a >> /storage/compressed/a/1 >> /storage/compressed/a/2 >> /storage/compressed/a/3 >> /storage/compressed/a/4 >> >> >> Of note: >> >> * FreeBSD 8.1-STABLE >> * ZFS filesystem version 4. >> * ZFS pool version 15. >> * zfs send is on compression off >> * zfs receive has compression on >> >> What I actually want to do and what fails: >> >> >> # zfs snapshot storage/bacula@2010.10.19 >> >> # zfs send storage/bacula@2010.10.19 | zfs receive -v >> storage/compressed/bacula >> receiving full stream of storage/bacula@2010.10.19 into >> storage/compressed/bacula@2010.10.19 >> received 4.38TB stream in 42490 seconds (108MB/sec) >> >> # zfs snapshot storage/bacula@2010.10.20 >> >> # zfs send -i storage/bacula@2010.10.19 storage/bacula@2010.10.20 | zfs >> receive -v storage/compressed/bacula >> receiving incremental stream of storage/bacula@2010.10.20 into >> storage/compressed/bacula@2010.10.20 >> cannot receive incremental stream: destination storage/compressed/bacula >> has been modified >> since most recent snapshot >> warning: cannot send 'storage/bacula@2010.10.20': Broken pipe >> >> I have no idea why this fails. Clues please? >> >> To my knowledge, the destination has not been written to. > > Has any read operation been done on the destination (ie: updated atime) ? Not that I know of. But I do think that is the issue. Thank you. Adding a -F option to the receive helps: # zfs send -i storage/bacula@2010.10.19 storage/bacula@2010.10.20 | zfs receive -vF storage/compressed/bacula receiving incremental stream of storage/bacula@2010.10.20 into storage/compressed/bacula@2010.10.20 received 20.0GB stream in 303 seconds (67.5MB/sec) Just after I sent my email, I found this post: http://lists.freebsd.org/pipermail/freebsd-current/2007-July/075774.html Problem solved. :) -- Dan Langille -- http://langille.org/
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