>>>>> On 2006-04-08 11:10 PDT, Adam Chlipala writes:
Adam> rsnapshot, the tool that we use for automatic on-disk
Adam> backup, has stopped working in the last few days. You
Adam> can see the high-level picture of what is going wrong in
Adam> /var/log/rsnapshot.log. /bin/cp fails during a large
Adam> copying job. When I run it manually, it terminates with
Adam> errors like:
Adam> /bin/cp: cannot access
Adam> `/home/backup/rsnapshot/daily.0/localhost/home/someone/somefile':
Adam> Cannot allocate memory /bin/cp: memory exhausted
Adam> Does anyone knowledgeable about such things know if
Adam> there is some way we can fix this? It might be related
Adam> to our use of ulimits.
Did you forget the exact same discussion we had 15 weeks ago?
I suggested using "link_dest 1" in /etc/rsnapshot.conf to replace
cp with rsync, because rsync uses O(1) memory (only allocates 1
fixed-size buffer) while cp uses O(n) memory. You said you had a
working patch for rsnapshot; perhaps an apt-get upgrade overwrote
your local changes.
--- Begin Message ---
>>>>> On 2005-12-24 21:11 PST, Karl Chen writes:
>>>>> On 2005-12-24 09:00 PST, Adam Chlipala writes:
Adam> We're using the rsnapshot Debian package. I'm confused
Adam> as to why it's using 'cp' instead of 'mv' for this
Adam> operation in the first place. It looks to me like that
Adam> copy operation is part of deleting the oldest backup and
Adam> rotating every other to the next lower slot number.
Adam> It definitely uses 'rsync' for what I take to be the
Adam> "interesting" part.
Karl> The --link-dest option greatly simplifies the logic for
Karl> this kind of script, but, even ignoreing that, just
Karl> replacing 'cp' with 'rsync' would be a good idea for the
Karl> other reasons I said.
I just looked, and rsnapshot actually does support using rsync
--link-dest instead of cp. Just set 'link_dest 1' in
/etc/rsnapshot.conf.
--
Karl 2005-12-24 21:11
--- End Message ---
--
Karl 2006-04-08 15:51
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