zfs discuss - Jul 2007 - Converting exisitng ZFS pool to MPxIO

We have a Sun v890, and I''m interested converting existing ZFS zpool
from c#t#d# to MPxIO.

% zpool status
  pool: data
 state: ONLINE
status: ONLINE
scrub: scrub completed with 0 errors on Sun Jul 15 10:58:33 2007
config:

        NAME        STATE     READ WRITE CKSUM
        data        ONLINE       0     0     0
          mirror    ONLINE       0     0     0
            c1t2d0  ONLINE       0     0     0
            c2t3d0  ONLINE       0     0     0
          mirror    ONLINE       0     0     0
            c1t4d0  ONLINE       0     0     0
            c2t5d0  ONLINE       0     0     0
          mirror    ONLINE       0     0     0
            c1t8d0  ONLINE       0     0     0
            c2t9d0  ONLINE       0     0     0

I''ve done some testing with a v880 and ZFS seems to support MPxIO with
no issues:

% zpool status
  pool: data2
 state: ONLINE
 scrub: none requested
config:

        NAME                       STATE     READ WRITE CKSUM
        data2                      ONLINE       0     0     0
          raidz2                   ONLINE       0     0     0
            c4t500000E010719A90d0  ONLINE       0     0     0
            c4t20000004CF307FEAd0  ONLINE       0     0     0
            c4t20000004CF307FF0d0  ONLINE       0     0     0
            c4t20000004CF3071A8d0  ONLINE       0     0     0
            c4t20000004CF3080BDd0  ONLINE       0     0     0
            c4t20000004CF308006d0  ONLINE       0     0     0
            c4t20000004CFBFB992d0  ONLINE       0     0     0
            c4t20000004CFBFBDECd0  ONLINE       0     0     0
            c4t20000004CFBFD33Dd0  ONLINE       0     0     0
            c4t20000004CFBFD37Ed0  ONLINE       0     0     0
            c4t20000014C338CD55d0  ONLINE       0     0     0

errors: No known data errors

After running # stmsboot -e, MPxIO will be enabled for fp on the v890, but
I''m not sure where to go from there. Is ZFS smart enough to recognize
MPxIO changes? Does anyone have any recommendations?

Thanks,

Nan Liu - System Admin
Netsmart Technologies?



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Nan Liu wrote:
> We have a Sun v890, and I''m interested converting existing ZFS
zpool from c#t#d# to MPxIO.
> I''ve done some testing with a v880 and ZFS seems to support MPxIO
with no issues:
correct.
> After running # stmsboot -e, MPxIO will be enabled for fp on the v890, but
I''m not sure where to go from there. Is ZFS smart enough to recognize
MPxIO changes? Does anyone have any recommendations?
Yes. You can check the devids of the vdevs that make up the
pool, and you''ll see that they don''t change under mpxio.


James C. McPherson
--
Solaris kernel software engineer
Sun Microsystems