Date: Thu, 04 Jul 2013 10:25:39 +0800 From: David Xu <davidxu@freebsd.org> To: Berend de Boer <berend@pobox.com> Cc: freebsd-fs@FreeBSD.org Subject: Re: EBS snapshot backups from a FreeBSD zfs file system: zpool freeze? Message-ID: <51D4DD23.5070706@freebsd.org> In-Reply-To: <87y59o3sug.wl%berend@pobox.com> References: <87li5o5tz2.wl%berend@pobox.com> <51D3C2F4.8010907@freebsd.org> <87y59o3sug.wl%berend@pobox.com>
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On 2013/07/03 17:17, Berend de Boer wrote: >>>>>> "David" == David Xu <davidxu@freebsd.org> writes: > > David> What you need is a tool to create snapshot on EBS server, > > FYI, EBS is not a server. It is NAS. It's block storage. > > -- > All the best, > > Berend de Boer > You can call it as NAS, but in pratical it is implemented as a server farm, we do have implemented a local EBS farm, normally, a command can be sent to a master server to request a snapshot for its client, the client can continuely writes to its iSCSI disk without being suspended by snapshot. HW snapshot is not a problem, because our clients uses journal file system, the snapshot even in inconsistent state will be recovered by its client OS when it is mounted. So our client does not need to support file system suspending or snapshot, only needs a journal file system. Regards, David Xu
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