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

[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.

It's a raidz2 pool with eight drives, the first two are Hitachi 7k2 deskstar drives, the other 6 are WD Green drives. They are all 2TB  and there is a separate device used for L2ARC, an 80GB x25m.

roy at mime:/home/roy$ /usr/sbin/zpool status
  pool: mimedata
 state: ONLINE
 scan: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        mimedata    ONLINE       0     0     0
          raidz2-0  ONLINE       0     0     0
            c4t0d0  ONLINE       0     0     0
            c4t1d0  ONLINE       0     0     0
            c4t2d0  ONLINE       0     0     0
            c4t3d0  ONLINE       0     0     0
            c4t4d0  ONLINE       0     0     0
            c4t5d0  ONLINE       0     0     0
            c4t6d0  ONLINE       0     0     0
            c4t7d0  ONLINE       0     0     0
        cache
          c7d0      ONLINE       0     0     0

errors: No known data errors


-- 
Vennlige hilsener / Best regards

roy
--
Roy Sigurd Karlsbakk
(+47) 97542685
roy at karlsbakk.net
http://blogg.karlsbakk.net/
--
I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk.