'Phil Stracchino' wrote:
>On 10/09/10 07:31, Henrik Johansen wrote:
>> $ dtrace -n 'sysinfo:::writech  / execname == "bacula-sd" / {
>> @dist[execname] = quantize(arg0); }'
>>
>> dtrace: description 'sysinfo:::writech  ' matched 4 probes
>> ^C
>>
>>    bacula-sd
>>             value  ------------- Distribution ------------- count
>>                 2 |                                         0
>>                 4 |                                         4
>>                 8 |                                         0
>>                16 |                                         3
>>                32 |                                         0
>>                64 |@@@@                                     75216
>>               128 |@                                        18477
>>               256 |@@@@                                     74357
>>               512 |                                         0
>>              1024 |                                         0
>>              2048 |                                         0
>>              4096 |                                         0
>>              8192 |                                         0
>>             16384 |                                         0
>>             32768 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@           514260
>>             65536 |                                         0
>>
>> This was taken during a single full backup of a windows client.
>>
>> The sysinfo:::writech call covers all write(2), writev(2) or pwrite(2)
>> system calls - writes generated by the bacula-sd process seem to be
>> limited to 32k, regardless of the underlying recordsize (upper block
>> size limit).
>>
>> I'll run this tonight when we have ~100 clients backing up towards this
>> machine - I'll will monitor the actual I/O size as seen by ZFS aswell
>> and post the output is someone is interested ...
>
>
>Please do.  This is interesting information.

Seems I was fooled by the quantize function - the raw size is 64512
bytes. According to the Bacula manual this also is the default maximum
block size for the SD ;-)

I'll bump that to 131072 bytes when I have some time and see how it
goes.

>
>-- 
>  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
>  alaric AT caerllewys DOT net   alaric AT metrocast DOT net   phil AT 
> co.ordinate DOT org
>         Renaissance Man, Unix ronin, Perl hacker, Free Stater
>                 It's not the years, it's the mileage.


-- 
Med venlig hilsen / Best Regards

Henrik Johansen
henrik AT scannet DOT dk
Tlf. 75 53 35 00

ScanNet Group
A/S ScanNet 

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