ASC: 0x29 (i_t nexus loss occurred) errors being logged against EMC storage devices

Asset ID:	1-72-1491725.1
Update Date:	2015-03-27
Keywords:

Solution Type Problem Resolution Sure

Solution 1491725.1 : ASC: 0x29 (i_t nexus loss occurred) errors being logged against EMC storage devices

Applies to:

3rd-Party Hardware - Version Not Applicable to Not Applicable [Release N/A]
Sun Fire E6900 Server
Information in this document applies to any platform.

Symptoms

The following errors are being logged on one or more FC hba paths going to EMC storage:

Aug 23 04:25:03 topas-db08 scsi: [ID 107833 kern.warning] WARNING: /pci@11,700000/SUNW,emlxs@0,1/fp@0,0/ssd@w50000972083271a4,d2 (ssd401):
Aug 23 04:25:03 topas-db08      Error for Command: read(10)                Error Level: Retryable
Aug 23 04:25:03 topas-db08 scsi: [ID 107833 kern.notice]        Requested Block: 64432560                  Error Block: 64432560
Aug 23 04:25:03 topas-db08 scsi: [ID 107833 kern.notice]        Vendor: EMC                                Serial Number: 28!rV000@
Aug 23 04:25:03 topas-db08 scsi: [ID 107833 kern.notice]        Sense Key: Unit Attention
Aug 23 04:25:03 topas-db08 scsi: [ID 107833 kern.notice]        ASC: 0x29 (i_t nexus loss occurred), ASCQ: 0x7, FRU: 0x0
Aug 23 05:50:41 topas-db08 scsi: [ID 107833 kern.warning] WARNING: /pci@11,700000/SUNW,emlxs@0,1/fp@0,0/ssd@w50000972083271a4,bd (ssd422):
Aug 23 05:50:41 topas-db08      Error for Command: write(10)               Error Level: Retryable
Aug 23 05:50:41 topas-db08 scsi: [ID 107833 kern.notice]        Requested Block: 62902464                  Error Block: 62902464
Aug 23 05:50:41 topas-db08 scsi: [ID 107833 kern.notice]        Vendor: EMC                                Serial Number: 28!r;000@
Aug 23 05:50:41 topas-db08 scsi: [ID 107833 kern.notice]        Sense Key: Unit Attention
Aug 23 05:50:41 topas-db08 scsi: [ID 107833 kern.notice]        ASC: 0x29 (i_t nexus loss occurred), ASCQ: 0x7, FRU: 0x0
Aug 23 05:54:29 topas-db08 scsi: [ID 107833 kern.warning] WARNING: /pci@11,700000/SUNW,emlxs@0,1/fp@0,0/ssd@w50000972083271a4,f (ssd596):
Aug 23 05:54:29 topas-db08      Error for Command: write(10)               Error Level: Retryable
Aug 23 05:54:29 topas-db08 scsi: [ID 107833 kern.notice]        Requested Block: 8328449                   Error Block: 8328449
Aug 23 05:54:29 topas-db08 scsi: [ID 107833 kern.notice]        Vendor: EMC                                Serial Number: 28!l!000@
Aug 23 05:54:29 topas-db08 scsi: [ID 107833 kern.notice]        Sense Key: Unit Attention
Aug 23 05:54:29 topas-db08 scsi: [ID 107833 kern.notice]        ASC: 0x29 (i_t nexus loss occurred), ASCQ: 0x7, FRU: 0x0
Aug 23 07:15:51 topas-db08 scsi: [ID 107833 kern.warning] WARNING: /pci@11,700000/SUNW,emlxs@0,1/fp@0,0/ssd@w50000972083271a4,10 (ssd595):
Aug 23 07:15:51 topas-db08      Error for Command: write(10)               Error Level: Retryable
Aug 23 07:15:51 topas-db08 scsi: [ID 107833 kern.notice]        Requested Block: 13812976                  Error Block: 13812976
Aug 23 07:15:51 topas-db08 scsi: [ID 107833 kern.notice]        Vendor: EMC                                Serial Number: 28!l"000@
Aug 23 07:15:51 topas-db08 scsi: [ID 107833 kern.notice]        Sense Key: Unit Attention
Aug 23 07:15:51 topas-db08 scsi: [ID 107833 kern.notice]        ASC: 0x29 (i_t nexus loss occurred), ASCQ: 0x7, FRU: 0x0
Aug 23 18:03:36 topas-db08 emlxs: [ID 349649 kern.info] [ 5.0314]emlxs3: NOTICE: 710: Link down.
Aug 23 18:04:23 topas-db08 emlxs: [ID 349649 kern.info] [ 5.0536]emlxs3: NOTICE: 720: Link up. (4Gb, fabric, initiator)
Aug 23 18:04:26 topas-db08 scsi: [ID 107833 kern.warning] WARNING: /pci@11,700000/SUNW,emlxs@0,1/fp@0,0/ssd@w50000972083271a4,c7 (ssd412):
Aug 23 18:04:26 topas-db08      Error for Command: read(10)                Error Level: Retryable

Cause

The cause of the above errors in this situation was that the EMC storage was not configured correctly for attachment to a Solaris Server.

There are flags that need to be set on the EMC storage front end adapters to allow it to communicate properly with the server.

If you see the above messages in the messages file on paths going to EMC storage, direct the customer to contact EMC to verify that the storage is configured correctly for attachment to a Solaris server.

Have the customer/EMC reference the following documents from the EMC Powerlink knowledge base:

emc242254 - "Solaris and Symmetrix VMAX: Sense Key: Unit Attention ASC: 0x3f (reported LUNs data has changed) and ASC: 0x29 (i_t nexus loss occurred), ASCQ: 0x7, FRU: 0x0 entries logged."

emc171432 - "Solaris host reports errors: ASC: 0x3f (reported LUNs data has changed)"

Solution

Have the customer contact EMC to verify that the correct bits are set on the EMC front end adapters to allow proper connectivity with a solaris server.

Attachments

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