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.
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