This post is more than 5 years old
265 Posts
0
1063
PP HP-UX , No Pseudo
PP naming
PowerPath for HP-UX supports only native devices. A native device
describes a device special file of one of the following forms:
◆ Block device ¿/dev/dsk/
◆ Raw device ¿/dev/rdsk/
emc87060 "How to test if PowerPath is load balancing and configured properly to failover"
spacer
so does PP support load balancing for raw devices in HP-UX
and if so
HOW in the hell ??????????
if my application ( oracle in my case) use native OS devices and not using pseudo device ( the magic layer)
then how does PP load balance I/O..
..................................
I am confused
Message was edited by:
Mosa3lyan
PowerPath for HP-UX supports only native devices. A native device
describes a device special file of one of the following forms:
◆ Block device ¿/dev/dsk/
◆ Raw device ¿/dev/rdsk/
emc87060 "How to test if PowerPath is load balancing and configured properly to failover"
spacer
so does PP support load balancing for raw devices in HP-UX
and if so
HOW in the hell ??????????
if my application ( oracle in my case) use native OS devices and not using pseudo device ( the magic layer)
then how does PP load balance I/O..
..................................
I am confused
Message was edited by:
Mosa3lyan
Brion2
154 Posts
1
August 11th, 2009 06:00
Brion2
154 Posts
2
August 10th, 2009 09:00
Essentially, all I/O and Ioctl operations to the SCSI driver first pass through PowerPath.
For those devices PowerPath is managing, it may load-balance, i.e. redirect the I/O or Ioctl to the SCSI driver on an alternate path (to the same physical LUN). Otherwise, the I/O or Ioctl is simply passed-through to the SCSI driver.
Hope this helps.
-Brion
Mosa3lyan
265 Posts
0
August 10th, 2009 10:00
AM I right ?????????????????!!!!!
Symmetrix ID=XXXXXXXXXXX
Logical device ID=0071
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
==============================================================================
0 0/0/4/1/0/4/0.118.0.1.0.8.6 c0t8d6 FA 8aB active alive 0 0
2 0/0/4/1/0/4/1.166.0.1.0.8.6 c2t8d6 FA 9aB active alive 0 0
in this case if i assigned c0t8d6 as raw device for oracle and the path to FA8ab failed will powerpath failover to c2t8d6
waiting u r answer
SKT2
2 Intern
2 Intern
•
1.3K Posts
0
August 29th, 2009 04:00
powermt watch can show how the load is currently getting distributed across the paths. Lok at IO/Sec
110 0/0/8/1/0.98.33.19.0 optimal 57 0 376 0 0
114 0/0/10/1/0.97.33.19.0 optimal 57 0 401 0 0
118 1/0/8/1/0.97.33.19.0 optimal 57 0 404 0 0
122 1/0/10/1/0.98.33.19.0 optimal 57 0 376 0 0
soncao01
12 Posts
0
September 30th, 2009 11:00
You can verify the load balancing by running "powermt display every=10"
Keep an eye on the IO/sec column for activity across all paths.