Is HP DSM built by their own or on top of MS MPIO?

[Dennis-Lee]

Is HP DSM built by their own or on top of MS MPIO?

We experienced an error on cluster/MPIO "All paths have failed. \Device\MPIODisk2 will be removed.". I google and find someone encountered the same error but I am runnig HP DSM(MPIO).

Windows 2008 R2 bug?

Should I update MPIO to 6.1.7601.17619? Is HP DSM built by their own or on top of MS MPIO(see to be the latter, right)?

http://social.technet.microsoft.com/Forums/en-US/winserverClustering/thread/9e9ca06d-5d1b-43d4-890d-4f9fa41f58d7/

*Windows Server 2008 x64 SP2 SAN disks falls off*

http://support.microsoft.com/kb/2522766

*The MPIO driver fails over all paths incorrectly when a transient single failure occurs in Windows Server 2008 or in Windows Server 2008 R2*

[Greybeard]

DSM = Device Specific Module.  Think device driver for MPIO, they work together, DSM is no use without MPIO and vice versa.