Date: Thu, 04 Jul 2013 09:52:52 +1200 From: Berend de Boer <berend@pobox.com> To: Gary Palmer <gpalmer@freebsd.org> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: EBS snapshot backups from a FreeBSD zfs file system: zpool freeze? Message-ID: <87k3l748gb.wl%berend@pobox.com> In-Reply-To: <20130703200241.GB60515@in-addr.com> 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> <871u7g57rl.wl%berend@pobox.com> <op.wznad7th34t2sn@tech304.office.supranet.net> <87mwq34emp.wl%berend@pobox.com> <20130703200241.GB60515@in-addr.com>
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>>>>> "Gary" == Gary Palmer <gpalmer@freebsd.org> writes:
Gary> Other than using SAN (FC or iSCSI), I know of no reason to
Gary> do backups at the raw disk level, nor any real demand.
Probably the hundreds of thousands of businesses that use Amazon AWS
disagree :-)
Gary> I've worked with people who have done LUN based backups in
Gary> the past and they have one drawback - they tend to back up
Gary> the entire LUN, irrespective of whether it is an allocated
Gary> block or not. Modern systems that implement some kind of
Gary> TRIM emulation (or cheat and sniff the filesystem block
Gary> allocation maps) may alleviate that problem.
That's not how EBS does a back up. It only backs up allocated blocks
for the first time, and for subsequent backups only back up the
changed blocks.
Gary> However, in the vast majority of cases, people back up from
Gary> above the FS, not below. This makes your use case probably
Gary> more tied to EBS than you may otherwise think.
People generally didn't have a choice I would say. Now millions of
servers run on top of block storage.
Disks are just software. That's the new world.
--
All the best,
Berend de Boer
------------------------------------------------------
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