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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  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
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