both EMC PowerMT and HPUX native MPIO enabled. Am i safe to remove the EMC PowerMT ?

[AlexCHChong]

HP-UX Admins,

My server currently is running HPVM with MCSC. The MSCS will manage the vm failover/online migrate.

i have both Native MPIO and EMC PowerMT enabled in HPUX 11.31 servers.

i check against the vm,  powermt and native MPIO, i realiazed they using same /dev/rdisk/diskXX.
Example in below:-

hpvmstatus -V -P vm01 |grep rdisk
Physical Device         : /dev/rdisk/disk181
Physical Device         : /dev/rdisk/disk176

ioscan -m dsf output:

/dev/rdisk/disk176       /dev/rdsk/c21t0d2
                                            /dev/rdsk/c23t0d2

/dev/rdisk/disk181       /dev/rdsk/c19t0d2
                                             /dev/rdsk/c25t0d2

PowerMt output:

Pseudo name=disk181
Symmetrix ID=000298701698
Logical device ID=02AB
state=alive; policy=BasicFailover; priority=0; queued-IOs=0;
==============================================================================
--------------- Host ---------------   - Stor -   -- I/O Path --  -- Stats ---
###  HW Path               I/O Paths    Interf.   Mode    State   Q-IOs Errors
==============================================================================
   5 0/0/0/5/0/0/1.0x50000975f01a894c.0x4002000000000000 c19t0d2   FA  4fA   active  alive       0      0
   7 0/0/0/7/0/0/1.0x50000975f01a8940.0x4002000000000000 c25t0d2   FA  1fA   active  alive       0      0

Pseudo name=disk176
Symmetrix ID=000298701699
Logical device ID=02AB
state=alive; policy=BasicFailover; priority=0; queued-IOs=0;
==============================================================================
--------------- Host ---------------   - Stor -   -- I/O Path --  -- Stats ---
###  HW Path               I/O Paths    Interf.   Mode    State   Q-IOs Errors
==============================================================================
   5 0/0/0/5/0/0/1.0x50000975f01a8d4c.0x4002000000000000 c21t0d2   FA  4fA   active  alive       0      0
   7 0/0/0/7/0/0/1.0x50000975f01a8d40.0x4002000000000000 c23t0d2   FA  1fA   active  alive       0      0

Since both Multipath software are enabled. Am i safe to remove the EMC PowerMT ?

Regards,

AlexCHChong

[Bill Hassell]

Remove the EMC Powerpath. Not only is it redundant, the native multipathing and Powerpath will interfere with each other and reduce performance.

[chindi]

Please remove EMC Powerpath , we too had faced a reboot when we had kept both Softwares.