On Fri, Sep 14, 2007 at 10:16:05AM +0100 or so it is rumoured hereabouts,
Conor Daly thought:
> On Fri, Sep 14, 2007 at 08:31:03AM +0100 or so it is rumoured hereabouts,
> Michael Watterson thought:
>> > How fast is the tape unit backup from the local disk?
>> 200Gb took just under 3.5 hours last night. Dump reports:
>> DUMP: Volume 1 completed at: Fri Sep 14 05:21:16 2007
> DUMP: Volume 1 208819200 blocks (203925.00MB)
> DUMP: Volume 1 took 3:33:34
> DUMP: Volume 1 transfer rate: 16296 kB/s
>> This is about 10 times the rate reported by dump on the source machine.
>> > How fast is the source machine copying to itself via loopback "localhost"?
>> Dunno yet, backup is still running. Will check soon.
Ok, ran a
dump -0 -f /path/to/local/file/on/disk /filesystem
on both the tape host and on the client machine. On the tape host:
DUMP: Volume 1 10080050 blocks (9843.80MB)
DUMP: Volume 1 took 0:04:54
DUMP: Volume 1 transfer rate: 34285 kB/s
On the client machine:
DUMP: Volume 1 14924940 blocks (14575.14MB)
DUMP: Volume 1 took 0:32:28
DUMP: Volume 1 transfer rate: 7661 kB/s
So, on the tape host, a dump to local disk is twice as fast as a dump to
tape. However, on the client machine, a dump to local disk is only half
as fast as the dump to tape on the tape host.
Currently running a dump to remote disk from the client machine to the
tape host. This is running at 1500kB/s.
A straight disk to disk copy of a 7Gb file on the client machine runs at
A straight disk to disk copy of a 9Gb file on the tape host runs at
Going to try a cpio test next...
Conor Daly <conor.daly at cod.homelinux.org>
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