Dear all,
For reference on the matter I was trying to resolve or improve, I have
increased RAM from 2Gb to 4Gb (the max for that machine) and backups reduced by
50% in completion time.
I had wrongly assessed in the past that it was taking 10 days to complete a
full backup, when it actually took around 7 days.
This has now been brought down to 3.5 days.
Incremental is now at 9 hours which is reasonable, albeit still on the slow
side.
We will try to improve things further based on all your much appreciated
information.
Thanks!
--------------------------
Cassiano Surek
[email protected]
On 7 Nov 2012, at 17:25, Les Mikesell wrote:
> On Wed, Nov 7, 2012 at 10:42 AM, Timothy J Massey <[email protected]> wrote:
>>
>> Cassiano Surek <[email protected]> wrote on 11/06/2012 05:03:44 AM:
>>
>>
>>> Of course, how could I have missed that! I did find it now, thanks Michał.
>>>
>>> Last full backup (of 100 odd Gb) took slightly north of 10 days to
>>> complete. Incremental, just over 5 days.
>>
>>
>> I did not see if you mentioned how *many* files you had. Are we talking
>> 100,000 files or 10 Million files? That will make a *big* difference in
>> performance.
>
> This will be especially true if the full directory listing sent before
> comparison starts fills RAM and pushes into swap. A couple of other
> performance-killers that haven't been mentioned yet:
>
> Running too many backups concurrently - on some systems 2 might be too many.
>
> Having large files that change frequently. This forces the server to
> uncompress the base copy and merge changes which will thresh the disk
> since they are on the same drive. This may be unavoidable, but it
> might be worth excluding things like log files you don't care about,
> database files that won't be consistent anyway, etc..
>
> --
> Les Mikesell
> [email protected]
>
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