Hi,

Well, sorry I forgot to mention that somewhat important information, those
are migration from local disk to tape. Backups over the network are done at
around 7 - 10 MB/s rate.


On 12/22/08 1:52 PM, "John Drescher" <drescherjm AT gmail DOT com> wrote:

> On Mon, Dec 22, 2008 at 1:29 PM, J-P <jphml AT videotron DOT ca> wrote:
>> Hi everybody,
>> 
>> I'm having speed/jamming issue when writing to my Dell PV124T which *seems*
>> to be related to Bacula. Basically, speed is really inconsistent, as in:
>> 
>>  Elapsed time:           10 secs
>>  SD Bytes Written:       920,245,603 (920.2 MB)
>>  Rate:                   92024.6 KB/s
>> 
>>  Elapsed time:           40 mins 53 secs
>>  SD Bytes Written:       72,574,315,017 (72.57 GB)
>>  Rate:                   29585.9 KB/s
>> 
>>  Elapsed time:           33 mins 40 secs
>>  SD Bytes Written:       2,402,398,034 (2.402 GB)
>>  Rate:                   1189.3 KB/s
>> 
>>  Elapsed time:           1 hour 10 secs
>>  SD Bytes Written:       18,271 (18.27 KB)
>>  Rate:                   0.0 KB/s
>> 
>> As you can see, the fastest is around 89 MB/s, but that is one of twenty
>> something migration. Now, that said, I've been testing multiple runs using
>> "dd if=/dev/zero of=/dev/nst0" and results are pretty consistent (between
>> 120 - 143 MB/s).
>> 
> 
> Are these all full backups. Anything other than fulls will not get
> good performance because the client OS will spend most of its time
> searching for the files to backup.
> 
> John



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