'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
> ala...@caerllewys.net ala...@metrocast.net p...@co.ordinate.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
hen...@scannet.dk
Tlf. 75 53 35 00
ScanNet Group
A/S ScanNet
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