ethanjohnsons
asked on
hdisk & hdiskpower
I am going to use EMC disks for AIX systems. What do hdisk and hdiskpower represent?
IN AIX, we just say hdisk, but with EMC, we have hdisk and hdiskpower.
thx much
IN AIX, we just say hdisk, but with EMC, we have hdisk and hdiskpower.
thx much
sentner
hdiskpower is the powerpath device. Basically it's a virtual device that balances the load across all of the assigned HBAs for that physical device, and provides path failure protection. You want to use the hdiskpower devices instead of the hdisk devices because otherwise if an HBA went offline, you'd lose access to the devices on that path.
ASKER
OK.. When you add PVs to VGs, do you add hdisks or hdiskpowers?
The reason I am asking is that i.e. hdiskpower1 for hdisk50 and hdisk5. I assume that you need to hdisks to VGs.
thx much
Pseudo name=hdiskpower1
Symmetrix ID=xxxxxxxxxxx
Logical device ID=020C
state=alive; policy=SymmOpt; priority=0; queued-IOs=0
==========================
---------------- Host --------------- - Stor - -- I/O Path - -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==========================
1 fscsi1 hdisk50 FA 10cB active alive 0 0
0 fscsi0 hdisk5 FA 7cB active alive 0 0
The reason I am asking is that i.e. hdiskpower1 for hdisk50 and hdisk5. I assume that you need to hdisks to VGs.
thx much
Pseudo name=hdiskpower1
Symmetrix ID=xxxxxxxxxxx
Logical device ID=020C
state=alive; policy=SymmOpt; priority=0; queued-IOs=0
==========================
---------------- Host --------------- - Stor - -- I/O Path - -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==========================
1 fscsi1 hdisk50 FA 10cB active alive 0 0
0 fscsi0 hdisk5 FA 7cB active alive 0 0
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