Re: Backup solutions

From: Eric Anderson (anderson_at_centtech.com)
Date: 11/26/05

  • Next message: Chris De Herrera : "Automated Reply from Chris De Herrera <cdeherrera3@forums.pocketpcfaq.com>" 
    Date: Sat, 26 Nov 2005 07:01:43 -0600
To: Robert Watson <rwatson@FreeBSD.org>

    Robert Watson wrote:
    > On Thu, 17 Nov 2005, Eric Anderson wrote:
    >
    >>> FWIW, i have read that by far the best is dump, because of the way it
    >>> deals with the raw data. No need to worry bout files with holes in
    >>> them (with other backup tools, this could mean you may not be able to
    >>> fit the file system back on after backup, if there are core files
    >>> etc) I believe i read this in the O'Rielly text Unix Power Tools, but
    >>> could be wrong. They also referenced an extensive test that was done
    >>> by someone, and gave the link. I will post it if i find it.
    >>
    >>
    >> rsync handles sparse files just fine.
    >
    >
    > The problem I've had with rsync is that it wants to build a list of all
    > files to be backed up. On my cyrus server, I have file systems with >6m
    > files. This causes rsync to core dump when it discovers it can't
    > allocate memory to hold the entire list at once.
    >
    > Recently I've taken to backing up with dump -L, as the snapshot facility
    > means recovery after a failure is a lot easier -- you no longer have to
    > worry about the fact that the first file in a directory might be backed
    > up at 10:00am, and the second at 2:00pm, causing applications to get
    > very upset.

    Unfortunately, I don't have that option, since the servers I am backing
    up are linux machines with a custom filesystem that does not support
    snapshots. rsync is easy on the network, but hard on the disks.

    Eric 

    -- 
------------------------------------------------------------------------
Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.
------------------------------------------------------------------------
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