MPxIO vs PowerPath for EMC SAN - Solaris 10

I'm just wondering what everyone's experience has been with either option. We are in the process of upgrading to a T5120 server using Solaris 10 and Oracle 9i (we can't upgrade yet due to limitations in our current blood bank software) and connect to an EMC SAN. Our vendor says that his preference is PowerPath because he's heard of systems hanging up when MPxIO option is used. Any ideas?

I'm not sure what kind of commentary you are looking for.
We use Powerpath on Solaris 10 (x86 now, but in the past on T5120s) for multipathing to LUNs on EMC VNX and CX4 SANs. We followed the EMC Powerpath setup guide for Solaris 10 exactly.
After disabling MPxIO, Powerpath was able to take control. Some older versions of powerpath had a bug where the pseudo names for LUNs would change causing some headaches.
We keep a mapping of LUN to pseudo name to solaris dsk labels
If you use ZFS I have found a 1:1 match between the zfs_max_vdev_pending value and the max queued-IOs value shown in Powerpath
When we've had to fail/trespass LUNs over to other SPs on the EMC SANs, Powerpath has handled this elegantly with the expected warnings in /var/adm/messages
I recall that we had to explicitly set the powerpath options for CLARiiON and VNX to managed and the policy to claropt
When adding LUNs, to see all paths there is a routine to go through with cfgadm, devfsadm and the powerpath utilities. We use qlogic HBAs and the qlc leadville driver.

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Mpxio or Powerpath -- with EMC SANs?

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I'm not sure what kind of commentary you are looking for.
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Moderator Action:
Already asked in the Database forum:
oct 2011 cpu patch for database on solaris
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=== DID Device Instances ===
DID Device Name: /dev/did/rdsk/d67
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Full Device Path: pno2:/dev/rdsk/c4t6006048000018799018253594D313038d0
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default_fencing: global
Disk ID: 6006048000018799018253594d313038
Ascii Disk ID:
Hope that helps a little.
Tim
---

MPxIO vs PowerPath for EMC SAN - Solaris 10

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