From: John Robinson <john.robinson@anonymous.org.uk>
To: Roberto Spadim <roberto@spadim.com.br>
Cc: hansbkk@gmail.com, Jeff Klingner <klingner@stanford.edu>,
linux-raid@vger.kernel.org
Subject: Re: raid1 with rotating offsite disks for backup
Date: Thu, 10 Feb 2011 08:43:38 +0000 [thread overview]
Message-ID: <4D53A53A.2000409@anonymous.org.uk> (raw)
In-Reply-To: <AANLkTin6UFR6pR-E+z29kTd9VioRVxQqmOR-ABTnWymu@mail.gmail.com>
On 09/02/2011 19:53, Roberto Spadim wrote:
> i agree with rsync
> rsync is more filesystem related feature
> if you want copy files, you should use rsync
> if you want to copy the device, may be a dd with devices?
> dd if=/dev/md0 of=/dev/sda
>
> if you want a snapshot copy, you should first remount your filesystem
> to readonly (there´s no flock() for /dev/md0 since filesystem don´t
> use flock() on /dev/md0) or another way to block writes to filesystem
> while you is read from device, some filesystems have online backup
> features..
> i don´t know lvm very well, but maybe they implement online backup there...
> i don´t think it´s a problem to solve at md level (it could work, but
> the raid1 purpose is make a fail safe device (or partially safe), not
> a online backup device)
I do both with several of my customers: md array with LVM on top,
suspend system services (mailstore), take snapshot, start system
services, then rsync diff the snapshot to another drive with luks
crypto, which gets rotated off-site once a week. Generally the backup
drives are bigger than the system array, so I can keep at least a week's
worth of nightlies and several months' worth of weeklies on each one.
Yes, I have my own separate securely-stored copies of their crypto keys.
Cheers,
John.
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prev parent reply other threads:[~2011-02-10 8:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-07 23:53 raid1 with rotating offsite disks for backup Jeff Klingner
2011-02-08 0:17 ` NeilBrown
2011-02-08 1:03 ` Jeff Klingner
2011-02-08 1:19 ` NeilBrown
2011-02-08 1:32 ` Jeff Klingner
2011-02-08 2:02 ` NeilBrown
2011-02-08 4:53 ` Leslie Rhorer
2011-02-08 5:37 ` Roberto Spadim
2011-02-08 6:07 ` NeilBrown
2011-02-08 6:12 ` Roberto Spadim
2011-02-08 3:04 ` Martin Cracauer
2011-02-08 3:40 ` Roberto Spadim
2011-02-09 19:37 ` hansbkk
2011-02-09 19:53 ` Roberto Spadim
2011-02-10 8:43 ` John Robinson [this message]
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