[OpenIndiana-discuss] [zfs-discuss] drive speeds etc

[Edward Ned Harvey]

> From: zfs-discuss-bounces at opensolaris.org [mailto:zfs-discuss-
> bounces at opensolaris.org] On Behalf Of Roy Sigurd Karlsbakk
>
>                  extended device statistics
> device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b
> sd1       0.5  140.3    0.3 2426.3  0.0  1.0    7.2   0  14
> sd2       0.0  138.3    0.0 2476.3  0.0  1.5   10.6   0  18
> sd3       0.0  303.9    0.0 2633.8  0.0  0.4    1.3   0   7
> sd4       0.5  306.9    0.3 2555.8  0.0  0.4    1.2   0   7
> sd5       1.0  308.5    0.5 2579.7  0.0  0.3    1.0   0   7
> sd6       1.0  304.9    0.5 2352.1  0.0  0.3    1.1   1   7
> sd7       1.0  298.9    0.5 2764.5  0.0  0.6    2.0   0  13
> sd8       1.0  304.9    0.5 2400.8  0.0  0.3    0.9   0   6

Unless I'm misunderstanding this output...
It looks like all disks are doing approx the same data throughput.
It looks like sd1 & sd2 are doing half the IOPS.

So sd1 & sd2 must be doing larger chunks.  How are these drives configured?  One vdev of raidz2?  No cache/log devices, etc...

It would be easy to explain, if you're striping mirrors.  Difficult (at least for me) to explain if you're using raidzN.