rwatson at FreeBSD.org
Sat Nov 26 12:32:34 GMT 2005
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
Robert N M Watson
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