Date: Tue, 09 Jul 2013 08:06:25 +1200 From: Berend de Boer <berend@pobox.com> To: Markus Gebert <markus.gebert@hostpoint.ch> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: EBS snapshot backups from a FreeBSD zfs file system: zpool freeze? Message-ID: <877gh024vy.wl%berend@pobox.com> In-Reply-To: <41CC5720-B1EA-4841-8BA5-893F4A628EAD@hostpoint.ch> References: <87li5o5tz2.wl%berend@pobox.com> <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>
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>>>>> "Markus" == Markus Gebert <markus.gebert@hostpoint.ch> writes:
Markus> By 'mount' do you mean the import of the pool? Did you use
Markus> -F on import? In any case, this sounds too long. Was the
Markus> system doing IO?
Yep, did -F as well, I believe I have seen the most disastrous imports
in that case, i.e. empty disks.
And it did continuous I/O, as best as I could determine at max disk
performance.
>> Another interesting thing I've seen was a completely empty
>> drive after mount!
Markus> That's a bit unspecific. What's empty? Disk full of zeros?
Markus> Partition full of zeros? Pool without file system on it?
Markus> Pool with empty filesystems?
With empty file systems.
Markus> What you really need in that case is the ability to
Markus> snapshot all EBS disks as group.
Which Linux offers.
Markus> Anyway, with the tools at hand (no IO "freeze" like Linux,
Markus> no EBS snapshots for groups of disks), I don't think you
Markus> can acomplish what you originally intended.
Indeed.
I think my best strategy is doing frequent ZFS snapshots to a stand-by
server, and take the backups from there.
--
All the best,
Berend de Boer
------------------------------------------------------
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