How to fix – PowerPath Degraded
You came to know that PowerPath is in degraded state either via your incident mechanism or via any alerting system you have. You have to fix it so PowerPath can take care of multi-path intelligently.Veritas is being used for managing devices and multipathing.
Login to server where issue reported and gain elevated privilege as super user and run below command. Location of PowerPath command varies depending upon OS. For RHEL you can use locate command to find out command location or which command in case of Solaris.
If you are using EMC Storage, SYMCLI, PowerPath in your environment it is better to set your .profile so you need not to worry about absolute path every time you want to run these commands. In general it gets installed in /usr/symcli/bin/. Veritas Volume Manager is present with PowerPath.
Normally this happens due to disks reclaimed.
# locate powermt for RHEL # which powermt for Solaris Problem Identification Run below command it will confirm if PowerPath is in degraded state or not. $ sudo powermt display Error: PowerPath 3072 pci@1e,600000/lpfc@3/fp@0,0 degraded 28 13 - 0 13 Solution for how to fix Powerpath in Degraded State To troubleshoot issue please run below commands 1. $ sudo powermt display dev=all You can use pipe to grep dead and look for “dead” device(s) – see example down Pseudo name=emcpower8a Symmetrix ID=000187880133 Logical device ID=0A52 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 ============================================================================== 3072 pci@1e,600000/lpfc@3/fp@0,0 c0t5006048ACCB4B149d56s0 FA 10cA active dead 0 1 2.Verify if device(s) are not in use via below command to make sure you are dealing with right devices. $ sudo vxdisk –eo alldgs list | grep –i emcpower8 3.If device not reported in step 2 you can proceed to step 3 to forcibly remove those devices. $ sudo powermt check force This will remove all the dead devices. 4. Re-validate PowerPath status run validation step again you will find it in optimal state. $ sudo powermt display 3072 pci@1e,600000/lpfc@3/fp@0,0 optimal 15 0 - 0 0
That’s all about how to fix powerpath in degraded State as now you have it in optimal state so you are good now and said issue is fixed.
We will be glad to know if it helps anyways either increasing knowledge base or you may be find it useful in fixing mentioned issue in your server infrastructure.
Request to share this if you find it meaningful.Also if interested in technical tips related to unix linux cloud and bigdata technologies please join below facebook group.