[Veritas-vx] Permanently disable DMP on a single controller

[John Rowan Littell]

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First off, my configuration:

Solaris 9 on a V240, Apple Xserve RAID, and Apple FC HBA (see
alienraid.org).  The hardware works quite well together, and Solaris
has no problems with the Apple hardware.  I have configured the
Xserve to have 4 500 GB RAID 5 sets, two per controller, thus giving
me two LUNs per controller going into the HBA.  Solaris sees:

c3t0d0
c3t0d1
c4t0d0
c4t0d1

The Xserve is slightly odd in that, while it has two controllers,
they each only address half the array, so c3 consists of the two RAID
5 sets on the left side and c4 consists of the two on the right side.

I initially had VxFS/VxVM 3.5 on the system and had configured
c3t0d0 and c4t0d0 into a striped 1TB set with a vxfs filesystem
and had left c3t0d1 and c4t0d1 unconfigured (but available in VxVM).
This worked fine.  I upgraded to 4.0 recently and DMP seems to now
believe that the d1 devices on each of these are alternate paths
to d0, which is incorrect.  vxdmpadm shows the following:

# vxdmpadm listctlr all
CTLR-NAME       ENCLR-TYPE      STATE      ENCLR-NAME
=====================================================
c4              Disk            ENABLED      Disk
c3              Disk            ENABLED      Disk
c1              Disk            ENABLED      Disk

# vxdmpadm getsubpaths ctlr=c3
NAME         STATE      PATH-TYPE[M] DMPNODENAME  ENCLR-TYPE   ENCLR-NAME   ATTRS
================================================================================
c3t0d0s2     ENABLED      -          c3t0d0s2     Disk         Disk           -
c3t0d1s2     ENABLED      -          c3t0d0s2     Disk         Disk           -

(and similar for c4.)

I initially tried disabling DMP following the advice from
http://www.eng.auburn.edu/pub/mail-lists/ssastuff/undmp.html
but this made veritas very unhappy at reboot, and I'd like to keep the
ability to use DMP in the future in case we ever get an array that
supports it.

So the question is: is there a way to permanently disable DMP for
specific controllers?  I'm currently trying various tweaks to
/kernel/drv/vxdmp.conf, but nothing seems to have any effect.

Thanks,
  --rowan


- -- 
John "Rowan" Littell
Systems Administrator
Earlham College Computing Services
http://www.earlham.edu/~littejo/
2004-04-08 17:44
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