#201130: SunFire V20z/ V40z With LSI MegaRaid (Cache Enabled) May Hang During I/O

SunFire V20z/ V40z With LSI MegaRaid (Cache Enabled) May Hang During I/O

Category :	Availability
Release Phase :	Resolved
Product :	Sun Fire V20z Server Sun Fire V40z Server
Bug Id :	6310808
Date of Workaround Release :	06-DEC-2005
Date of Resolved Release :	03-Apr-2008

Sun Fire V20z and V40z systems running Solaris 10 x86 with the LSI MegaRaid ... see below:

1. Impact

Sun Fire V20z and V40z systems running Solaris 10 x86 with the LSI MegaRaid (SCSI) card and the accompanying "amr" driver (with the RAID caching feature enabled) may experience a hang or disruption of system I/O.

2. Contributing Factors

This issue can occur on the following platforms:

SunFire V20z and V40z with Solaris 10 (x86) and LSI MegaRaid SCSI card (using the "amr" driver and RAID caching feature enabled)

Notes:

SPARC systems are not affected by this issue.
Solaris 8 and 9 are not affected by this issue.
The RAID caching feature must be enabled on the LSI MegaRaid card for this condition to occur.

To determine if the system is using the "amr" driver, the following command can be run:

    # modinfo | grep -i amr
    24 fffffffffbac0060   44b0  40   1  amr (AMR Driver V1.5)

3. Symptoms

Should the described issue occur, "amr warning" messages similar to the following may be output to the "/var/adm/messages" log file and system console:

    Aug 13 14:26:45 va64-v40za amr: WARNING: timed out package 
    detected,                          
    sc = ffffffff809fc000, pkt = ffffffff872f5080, index = 0, ac = 
    ffffffff872f50e0
    Aug 13 14:26:45 va64-v40za scsi: WARNING: 
    /pci@0,0/pci1022,7450@a/pci1014,1a7@5/pci1000,532@0/sd@1,0 (sd17):
    Aug 13 14:26:45 va64-v40za      SCSI transport failed: reason 'timeout': 
    retrying command
    Aug 13 14:26:45 va64-v40za amr: WARNING: timed out package 
    detected,                          
    sc = ffffffff809fc000, pkt = ffffffff83a0c040, index = 1, ac = 
    ffffffff83a0c0a0
    Aug 13 14:26:45 va64-v40za scsi: WARNING: 
    /pci@0,0/pci1022,7450@a/pci1014,1a7@5/pci1000,532@0/sd@0,0 (sd1):
    Aug 13 14:26:45 va64-v40za      SCSI transport failed: reason 'timeout': 
    retrying command

4. Workaround

To work around the described issue, use one of the following options:

1. Set the LSI MegaRaid caching feature to default values in the LSI MegaRaid configuration utility (CTRL-M). All defined LUNs should have the following caching parameter values:

    Read Policy = Normal
    Write Policy = Writethru
    Cache Policy = Direct I/O

Note: Setting the caching parameters to default values may impact system I/O performance.

Or:

2. Replace the the orginal LSI "amr" driver with the "lsimega" driver by downloading the file "solsimega.zip" from http://www.sun.com/download/products.xml?id=431fd1be

Instructions for installing the new driver are included in the download file. (A Sun account for login is required to download this file).

Note: The "lsimega" driver will be bundled with Solaris 10 x86 Update 1, scheduled for release in January 2006.

5. Resolution

There are no further updates planned for this Sun Alert document. If
you need additional assistance regarding this issue, please contact Sun
Services.

This Sun Alert notification is being provided to you on an "AS IS" basis. This Sun Alert notification may contain information provided by third parties. The issues described in this Sun Alert notification may or may not impact your system(s). Sun makes no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun proprietary and confidential information. It is being provided to you pursuant to the provisions of your agreement to purchase services from Sun, or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun Alert notification may only be used for the purposes contemplated by these agreements.

Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.

Modification History

03-Apr-2008: no further updates. Resolved

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