Approved: Fortect
In the past few days, some of our users have encountered the emc powerpath I / O error. There are a number of factors that can cause this problem. We will talk about this below.
Symptoms
Reason
Resolution
Additional information
The asb: iopf parameter means automatic algorithm on intermittent I / O in standby mode.
PowerPaths transition to asb: iopf state. The following messages are displayed in the / var / adm / messages file:
Why is my EMC powermt command not working?
If the file / dev / emcpowera is mounted and invoked by the program, the following command will not be placed. This command searches for available EMC SAN LUNs and adds them to the PowerPath configuration list. Powermt configuration command, some people set parameters to exceed the set values.
18 Feb 07:59:13 hostname emcp: [ID 801593 kern.notice] Info: bus path 3110 Tgt XXXXXXXXXXXXX Mon 53 to CLARiiON CKM000000000000 Identity icons set to asb: iopf.
Feb 07:59:13 Twentyemcp hostname: [ID 801593 kern.notice] Info: Bus path 3110 Tgt XXXXXXXXXXXXX Mon 53 was moved to iopf with the following error sequence
07: 59: 13 emcp hostname: [ID 801593 kern.notice] Info : Chemin Bus 3110 Tgt XXXXXXXXXXXXX Mon 53, ErrInst 2061db7, TimeStamp 2018 Feb 18 03:00:30 GMT, SCSI I / O error ErrCode
07:59:13 twenty emcp hostname: [ID 801593 kern.notice] Info : Chemin Bus 3110 Tgt XXXXXXXXXXXXX Mon 53, ErrInst 2061db8, TimeStamp 2018 Feb 18 03:00:30 GMT, SCSI I / O error ErrCode
Feb 07:59:13 18 Tgt XXXXXXXXXXXXXX Mon 53, ErrInst 2061d 189, TimeStamp Feb 03:00:30 GMT, ErrCode SCSI I / O error Feb 18 07:59:13 XXXXXXXXXXXXX Mon 53, 20656e8, errinst TimeStamp 20 18 Feb 18 03:58:40 GMT, ErrCode SCSI IO error
If these paths report SCSI I / O errors, PowerPath marks them all as “asb: iopf” to avoid unstable paths so that the I / O paths are active.
What do you need to know about EMC powerpath?
EMC PowerPath is software designed for balancing thousands, path management, and device management. A distinct virtual device emc powerpath is created for each allocated storage device, named exactly like emcpower ###, where ### is a number.
To figure out why these paths are reporting I / O read errors, changes made (fabric, SAN, or bay).
This is not a PowerPath problem. In this case, these errors were corrected by replacing the cables.
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Approved: Fortect
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