Re: Backup methodes
From: Bakul Shah (bakul_at_BitBlocks.com)
Date: 11/08/05
- Previous message: Koen Martens: "Re: Backup methodes"
- In reply to: Thomas Hurst: "Re: Backup methodes"
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To: Thomas Hurst <tom.hurst@clara.net> Date: Tue, 08 Nov 2005 13:21:23 -0800
Thomas Hurst <tom.hurst@clara.net> writes:
> * Carlos Silva aka |Danger_Man| (full-disclosure@csilva.org) wrote:
>
> > what is the best method to backup network information and local disk
> > information with another disk?
>
> dump/restore performs snapshotted incremental backups of complete
> filesystems.
I have been using venti from plan9ports (a set of plan9
programs ported to unix like OSes) for the past few months
now. See http://swtch.com/plan9ports
Features:
- backup ufs1 and ufs2 over the net to a venti server
- Initial full backup seems faster than dump's level 0 backup
(I get about 3 to 7 MBps to a USB2 disk).
- Saves only one copy of every distinct block no matter
which file it belongs to or how many times you give it to
venti => less filling, more nutricious!
- Every backup is a full backup but because of the above
feature venti stores only changed or new blocks. This
incremental backup works at close to max disk speed. (I
can backup a 30GB filesystem in under 25 minutes to a USB2
disk). Speed of the disk being backed up is the bottleneck
so you can simulteneously backup multiple disks to utilize a
venti server's full disk/net bandwidth. This is fast enough
that backing up everything every night actually works!
- each backup returns a single `score'. This serves
as a handle to grab the same backup later on.
- you can nfs mount the backups. *every* snapshot is
available. For example, /dump/my-host/2005/1105/usr.
- you can ftp browse a specific backup by giving its score.
- You can recreate the image of a partition as per a
specific backup. For instance 'vcat <score> > /dev/da0s1e'
will recreate a specific disk image. You can then mount it
just like a normal disk partition. Though I'd much prefer
it if md(4) did this as then it can fetch data on demand.
mdconfig -a -t venti -v <venti-server> -s <score>
It still has some warts (for example its security model
doesn't quite work well for a full restore and you have to
resort to vcat) but overall it has been a vast improvement
over dump/restore for me. venti can also be used back up file
trees like tar does. Venti is close to a Ginsu knife of
archiving:-)
-- bakul
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- Previous message: Koen Martens: "Re: Backup methodes"
- In reply to: Thomas Hurst: "Re: Backup methodes"
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