EMC PowerPath basic commands
PowerPath is a multipathing software for Unix operating systems from EMC. If you have ever worked or you are going to work in an environment that includes EMC storage systems it is more than sure that PowerPath will be installed in the Unix hosts.
Following are some notes and tips I’ve been creating since the very first time I found Powerpath, of course this isn’t a full user guide but a sort of personal quick reference. I decide to put it here in the hope that it will be helpful to anyone and for my personal use.
- Show
powermt
command version
[root@totoro] / # powermt version
EMC powermt for PowerPath (c) Version 5.1.0 (build 160)
- Display PowerPath configuration.
[root@totoro] / # powermt display
Symmetrix logical device count=898
CLARiiON logical device count=0
Hitachi logical device count=0
Invista logical device count=0
HP xp logical device count=0
Ess logical device count=0
HP HSx logical device count=0
==============================================================================
----- Host Bus Adapters --------- ------ I/O Paths ----- ------ Stats ------
### HW Path Summary Total Dead IO/Sec Q-IOs Errors
==============================================================================
5 0/2/1/0.101.16.19.0 optimal 61 0 - 0 0
6 0/2/1/0.101.16.19.1 optimal 102 0 - 0 0
7 0/2/1/0.101.16.19.2 optimal 97 0 - 0 0
8 0/2/1/0.101.16.19.3 optimal 113 0 - 0 0
9 0/2/1/0.101.16.19.4 optimal 82 0 - 0 0
11 0/2/1/0.101.43.19.0 optimal 128 0 - 0 0
12 0/2/1/0.101.43.19.1 optimal 49 0 - 0 0
13 0/2/1/0.101.43.19.2 optimal 57 0 - 0 0
14 0/2/1/0.101.43.19.3 optimal 83 0 - 0 0
15 0/2/1/0.101.43.19.4 optimal 74 0 - 0 0
16 0/2/1/0.101.43.19.5 optimal 33 0 - 0 0
17 0/2/1/0.101.43.19.6 optimal 19 0 - 0 0
19 0/5/1/0.102.16.19.0 optimal 61 0 - 0 0
20 0/5/1/0.102.16.19.1 optimal 102 0 - 0 0
21 0/5/1/0.102.16.19.2 optimal 97 0 - 0 0
22 0/5/1/0.102.16.19.3 optimal 113 0 - 0 0
23 0/5/1/0.102.16.19.4 optimal 82 0 - 0 0
25 0/5/1/0.102.43.19.0 optimal 128 0 - 0 0
26 0/5/1/0.102.43.19.1 optimal 49 0 - 0 0
27 0/5/1/0.102.43.19.2 optimal 57 0 - 0 0
28 0/5/1/0.102.43.19.3 optimal 83 0 - 0 0
29 0/5/1/0.102.43.19.4 optimal 74 0 - 0 0
30 0/5/1/0.102.43.19.5 optimal 33 0 - 0 0
31 0/5/1/0.102.43.19.6 optimal 19 0 - 0 0
[root@totoro] / #
- Check for death paths and remove them.
[root@sheldon] / # powermt display
Symmetrix logical device count=34
CLARiiON logical device count=0
Hitachi logical device count=0
Invista logical device count=0
HP xp logical device count=0
Ess logical device count=0
HP HSx logical device count=0
==============================================================================
----- Host Bus Adapters --------- ------ I/O Paths ----- ------ Stats ------
### HW Path Summary Total Dead IO/Sec Q-IOs Errors
==============================================================================
17 UNKNOWN failed 1 1 - 0 0
31 UNKNOWN failed 1 1 - 0 0
37 1/0/14/1/0.109.85.19.0 optimal 32 0 - 0 0
39 0/0/14/1/0.110.85.19.0 optimal 32 0 - 0 0
[root@sheldon] / # powermt check
Warning: Symmetrix device path c17t9d6 is currently dead.
Do you want to remove it (y/n/a/q)? y
Warning: Symmetrix device path c31t9d6 is currently dead.
Do you want to remove it (y/n/a/q)? y
[root@sheldon] / #
- List all devices.
[root@totoro] / # powermt display dev=all
- Remove all devices.
[root@totoro] / # powermt remove dev=all
- Add a new disk in HP-UX, configure it and save the config:
After a rescan of the disks with ioscan
and the creation of the device files with insf
run the following command to add the new disk to PowerPath
[root@totoro] / # powermt config
Now display all the devices and look the for the Logical device ID
of the disk.
[root@totoro] / # powermt display dev=all | more
...
...
Symmetrix ID=000287750035
Logical device ID=0004
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
==============================================================================
20 0/0/10/1/0.11.15.0.0.1.3 c20t1d3 SP A0 active alive 0 1
23 0/0/10/1/0.11.47.0.0.1.3 c23t1d3 SP B0 active alive 0 1
26 1/0/8/1/0.21.15.0.0.1.3 c26t1d3 SP A1 active alive 0 1
29 1/0/8/1/0.21.47.0.0.1.3 c29t1d3 SP B1 active alive 0 1
...
...
If everything went fine save the config.
[root@totoro] / # powermt save
And these are the most common tasks I’ve been doing with PowerPath. I’ll try to put some order into my notes and personal how-to files and write more posts like this one.
Juanma.
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