Re: backup the entire server
From: Aleksandar Milivojevic (amilivojevic_at_pbl.ca)
Date: 04/14/05
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Date: Thu, 14 Apr 2005 14:47:15 -0500 To: For users of Fedora Core releases <fedora-list@redhat.com>
Rick Stevens wrote:
> As Aleksander says, block-level backup can also be accomplished by using
> RAID-1 and using the secondary drive(s) as the backup media. You can
> then "fail" the secondary drive(s), pull them out, replace them, and ask
> your RAID to rebuild the secondaries. This is very, very clunky and I
> do not recommend doing it--but it is an option.
Actually, what I had in mind were Solaris boxes that have some extra
features (such as offlining, three-way mirrors, and file system locks).
And certanly nothing like failing the drives or ripping them out ;-)
Something along the lines:
# /etc/init.d/my-apps stop
# lockfs -fw /mount/point
# metaoffline d10 d11
# lockfs -u /mount/point
# /etc/init.d/my-apps start
# ufsdump 0f /dev/rmt/0n /dev/md/rdsk/d11
# metaonline d10 d11
If d10 was two-way mirror (the only kind of mirror available on Linux),
redundancy is lost during backup. If it was three-way mirror (Solaris
has support for it), redundancy is not lost (but you need 50% more of
disk space compared to two-way mirroring, oh well). Plus, example above
uses offline/online commands (not dettach/attach). When d11 is onlined,
only changed disk blocks are synced (not entire partition). AFAIK,
Linux lacks support for lockfs and online/offline operations. So for
large partitions on Linux this isn't a good option (huge
detached/reattached partitions can take hours to sync on Linux, while
offlined/onlined partitions on Solaris can sync very fast, depending on
how many writes were to the disk while submirror was offlined).
-- Aleksandar Milivojevic <amilivojevic@pbl.ca> Pollard Banknote Limited Systems Administrator 1499 Buffalo Place Tel: (204) 474-2323 ext 276 Winnipeg, MB R3T 1L7 -- fedora-list mailing list fedora-list@redhat.com To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list
- Previous message: Neal Wilkinson: "Re: Getting Root mail in normal e-mail client"
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