This article indicates the general steps of replacing failed HBA of Linux Host connected to Symmetrix array through PowerPath.

The following steps indicate the general failure HBA replacement steps, the steps apply on Symmetrix DMX & VMAX storage array:


For Linux Host running PowerPath:


Step 1, Identify faulty HBA number through PowerPath command:

powermt display

Step 2, Remove HBA from PowerPath, # is path number. (Pull out cable physically if faulty HBA is ready to be replaced)

Powermt remove hba=#

Step 4, Record the faulty WWN. Switch the HBA physically (refer HBA provider recommended steps), .


Step 5, If WWN zoning is configured, refresh the zoning setting between the switch to reflect the new HBA. ( Skip this step, if Port Zoning is configured)


Step 6, Confirm new HBA is identified by Linux Host, Verify the zoning setting on the switches to reflect the new HBA WWN is correct.


Step 7, Once the zoning information has been updated, update the masking information on the Symmetrix for the new HBA, this can be done with following command:


DMX Series:


Below command replaces the host WWN/iSCSI initiator without losing current device masking information.

symmask -sid SymmID -wwn old-wwn replace new-wwn

VMAX Series:

symaccess replace -wwn wwn -new_wwn NewWWN [-noprompt]

For example, Run symaccess replace to substitute a new WWN for all occurrences of the old WWN. For example, to replace old WWN 20000000c920b484 with new WWN 20000000c920b393:

symaccess sid 814 replace wwn 20000000c920b484 -new_wwn 20000000c920b393

Run below command to establish the new AWWN and assign an AWWN to the new HBA in the login history table:

symaccess discover -rename

Step 7, Re-scan Linux native device, # is new HBA number

# echo “- - -” > /sys/class/scsi_host/host#/scan

Step 8, Refresh PowerPath configuration:

powermt config

powermt save

Step 9, Verify all path are “Alive”

powermt display

Author: Fenglin Li

             

iEMC APJ

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