On Thu, Mar 12, 2009 at 9:32 AM, Dan Langille <dan AT langille DOT org> wrote:
> John Drescher wrote:
>> On Thu, Mar 12, 2009 at 8:38 AM, Victor Hugo dos Santos
>> <listas.vhs AT gmail DOT com> wrote:
>>> On Wed, Mar 11, 2009 at 6:37 PM, John Drescher <drescherjm AT gmail DOT 
>>> com> wrote:
>>>> On Wed, Mar 11, 2009 at 5:01 PM, Victor Hugo dos Santos
>>>> <listas.vhs AT gmail DOT com> wrote:
>>> [...]
>>>
>>>> This is expected for incremental backups because the hard drive spends
>>>> most of the time thrashing finding the files to backup. However in
>>>> most cases even with the low data rate this is much faster than
>>>> running a full backup with a much higher backup rate.
>>> the same problem in FULL backup.. look:
>>>
>> You are using software compression. That will drastically slow down a backup.
>
> What John said.  Turn off software compression.
>

I am not sure what the OP is trying to optimize here however I do have
a few ideas if I guess the problem correctly.

Assumption: Need to backup 40 desktops/servers to a disk array with
reasonable performance (want all jobs to finish over night) and want
to use software compression to get more space


What I would do is use concurrency (5 to 10 simultaneous jobs running
at the same time) and a small spool file size (2 to 5GB) and run the
jobs at night. This way the individual clients may have a low backup
rate because they are spending a lot of time compressing files or in
the case of incremental jobs they are spending a lot of time searching
for changed files. However in this case the backup server is
constantly busy writing to disk and more work is being done at one
time.

John

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