AIX and VIOS based servers and their clients using SDDPCM, may experience permanent application errors during SVC node upgrade or reset.

Flash (Alert)


Abstract

This is a follow-on to flash S1003579, noting additional changes made to prevent permanent application failures from occurring, when a AIX or VIOS server receives a SCSI error condition from a SVC cluster of SCSI Check Condition, Not Ready, Logical Unit not accessible, Target port in Unavailable State. These errors will be logged as a SC_DISK_ERR2 error in the AIX or VIOS server error log. The scope of this flash is expanded to all AIX and VIOS SDDPCM servers and clients (not just NPIV clients).

Content

There is a follow-on flash available, recommended SDDPCM level is 2.6.0.3 or higher

Contents of this flash:

Permanent application failures may occur when an AIX based partition (running AIX, or VIOS) that is a host to a SVC cluster, receives a SCSI error condition (SCSI Check Condition, Not Ready, Logical Unit not accessible, Target port in Unavailable State) from the SVC cluster, if the following AIX APARS are installed along with any level of SDDPCM older then 2.6.0.1:

.
This exposure, although rare, exists in any AIX or VIOS partition, using SDDPCM and with the AIX APARS listed in the following table installed.
This issue has been primarily encountered by VIOS client partitions that are using NPIV. However it can also occur with any AIX based partition (stand alone AIX, VIOS and VIOS client using VSCSI).

The changes made for VIOS client hangs in technote #ssg1S1003579 require additional AIX driver and SDDPCM code updates for the following condition:

An SVC error is logged as an SC_DISK_ERR2 in the VIOS error log and translated:

SCSI Status 0x2 - Check Condition
Sense Key 0x2 - Not Ready
Code/Qualifier 0x4/0xC - Logical Unit Not Accessible, Target Port In Unavailable State

This condition may be present for a short time when performing a firmware upgrade of the SVC cluster, or when a SVC cluster node resets (due to a node assert, node failure or intentional restart of a node), and other potential causes not mentioned here.

The recoverable errors may be logged as SC_DISK_ERR2 and SC_DISK_ERR5 logged on the VIOS, and SC_DISK_ERR1, SC_DISK_ERR2, and SC_DISK_ERR7's logged on the AIX VIO client. These normally recoverable errors may cause a permanent LVDD or application failure without the matching SDDPCM code change.


The following AIX APARs will expose this issue. If any of these APARs (or their subsequent supersedes) are installed on a partition running SDDPCM, then SDDPCM must be at 2.6.0.1 or higher to eliminate the exposure.

AIX APAR
------- --------
53TL7 IZ64084
53TL8 IZ63805
53TL9 IZ63806
53TL10 IZ63807
53TL11 IZ62309 or IZ63808 (IZ63808 replaces IZ62309)
53TL12 (IZ63809 included in base)

61TL1 IZ63810
61TL2 IZ63811
61TL3 IZ63812
61TL4 IZ62301 or IZ63813 (IZ63813 replaces IZ62301)
61TL5 (IZ63814 included in base)

VIOS 2.1 FP22 or higher
VIOS 1.5 FP11.1 SP01 or higher

Related information

Previous SDDPCM FLASH
SVC Matrix Restrictions for VIOS clients and servers
SDDPCM 2.6.0.1 Readme Fix #4748
SDDPCM Downloads
SDDPCM 2.6.0.3 follow-on Flash

Cross Reference information
Segment Product Component Platform Version Edition
Storage Virtualization SAN Volume Controller V5.1.x AIX Version Independent
Storage Virtualization SAN Volume Controller V4.3.x AIX Version Independent

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Document information


More support for:

System Storage Multipath Subsystem Device Driver

Software version:

2.4.0.5, 2.4.0.3 and below, 2.5.0.0, 2.5.0.1, 2.5.1.0, 2.6.0.0

Operating system(s):

AIX 5.3/6.1

Reference #:

S1003649

Modified date:

2010-08-17

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