Date: Tue, 09 Jul 2013 10:31:49 +1200 From: Berend de Boer <berend@pobox.com> To: Freddie Cash <fjwcash@gmail.com> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: EBS snapshot backups from a FreeBSD zfs file system: zpool freeze? Message-ID: <87vc4kznsa.wl%berend@pobox.com> In-Reply-To: <CAOjFWZ4CcGP-5axPewCA0hhqxoFuQ1E9zvZyqGWPbWsW1d5jOw@mail.gmail.com> References: <CA%2BtpaK1jQuKneQsxkVfxJGzXdPdLZfqBM1QWQ0e19nK5t71t1Q@mail.gmail.com> <87ehbg5raq.wl%berend@pobox.com> <20130703055047.GA54853@icarus.home.lan> <6488DECC-2455-4E92-B432-C39490D18484@dragondata.com> <CADBaqmihCB5JP01hLwXTWHoZiJJ5-jkT-Ro=oDwOcKZT_zvEKA@mail.gmail.com> <A5A66641-5EF9-454E-A767-009480EE404E@dragondata.com> <14A2336A-969C-4A13-9EFA-C0C42A12039F@hostpoint.ch> <87zjty11gn.wl%berend@pobox.com> <41CC5720-B1EA-4841-8BA5-893F4A628EAD@hostpoint.ch> <877gh024vy.wl%berend@pobox.com> <20130708210145.GA89605@icarus.home.lan> <CAOjFWZ4CcGP-5axPewCA0hhqxoFuQ1E9zvZyqGWPbWsW1d5jOw@mail.gmail.com>
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>>>>> "Freddie" =3D=3D Freddie Cash <fjwcash@gmail.com> writes:
Freddie> Something else to consider is that this may not be a
Freddie> FreeBSD issue at all, but a filesystem/storage system
Freddie> issue.=C2=A0 Meaning, if you use ZFS on Linux ... EBS backups
Freddie> will not work.=C2=A0 Same if you try to use Solaris or Illumos
Freddie> or any other ZFS-enabled OS that will run in Amazon's
Freddie> cloud.
And you are exactly right. I can only freeze file systems on Linux
that's support that. For example lvm/xfs support that. Not sure about
ext, last time I tried that (Ubuntu 12.04) it didn't.
I didn't dare to use ZFS on Linux, so didn't check, but given my
experience with ZFS so far I doubt they would have added this. And
they would have, as it is a file system specific thing.
Freddie> At which point, it would make more sense taking the
Freddie> discussion upstream to Illumos to find a way to quiesce a
Freddie> ZFS pool in such a way that EBS backups would work.=C2=A0 Once
Freddie> that is done, then it can filter downstream to FreeBSD,
Freddie> Linux, and others.
Great tip. Didn't know exactly if the ZFS implementation in FreeBSD
was forked or not. I see on their home page about submitting patches
:-)
I've been on #zfs but not much feedback there. I'll join their mailing
list and ask this question.
--=20
Thanks again,
Berend de Boer
------------------------------------------------------
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