Hi,
Stephen Vaughan wrote on 2008-09-03 09:26:57 +1000 [Re: [BackupPC-users] NAS
performance over NFS]:
> That's cool, I'll work on it. The NAS is fairly big, so I'm thinking if I
> turn compression completely off it should improve backup times. At the
> moment it's set to 3, but I don't really need the compression so I might
> just turn it off...
as your bottleneck seems to be data transfer between BackupPC server and NAS
device, I would expect increasing the amount of data to be transferred to
actually slow things down rather than speed them up. Remember that compression/
uncompression is done by the server, not the NAS device. Compression is
probably rather expensive in terms of server CPU usage, but BackupPC tries to
avoid compression in favour of uncompression where possible.
I'm not sure if compressed files need to be uncompressed in any case in order
to determine their length - that would definitely be slower than a stat on an
uncompressed file. A quick check shows that the file size is in the attrib
file, so it's probably not the case.
I'm surprised that noone seems to find using a dedicated network segment
between BackupPC server and NAS device worthwhile. While it may not solve the
problems caused by bad NFS parameters, and the effect depends on your current
network topology, you would in any case limit access to the NAS device, which
is a good thing (if you want that, that is :), and you can use the highest
link speed the NAS device supports (presuming you have/add an appropriate NIC
in the server, of course) without being limited by the rest of your network.
Your NAS device does not, by any chance, support iSCSI or ATA over ethernet? :)
Regards,
Holger
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