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[Bug 242063] New: SLES10 - Error message from SYNC CACHE cmd fills up kernel log
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Sun, 4 Feb 2007 18:25:56 -0700 (MST)
  • Message-id: <bug-242063-21960@xxxxxxxxxxxxxxxxxxxxxxxxx/>

Summary: SLES10 - Error message from SYNC CACHE cmd fills up
kernel log
Product: SUSE Linux 10.1
Version: Final
Platform: Other
OS/Version: Other
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Kernel
AssignedTo: kernel-maintainers@xxxxxxxxxxxxxxxxxxxxxx
ReportedBy: sumant.patro@xxxxxxx
QAContact: qa@xxxxxxx
CC: rbowns@xxxxxxxxxx

This issue is with ref to SLES 10.

MegaRAID (MR) Adapter is exposing VDs (Logical Disks) with WCE enabled in Mode
Sense command for drives that are configured as WriteBack by the user. When
the VDs are exported as Write Back drives, SLES 10 OS is sending “Synchronize
Cache” command to the drives frequently. Per SCSI Spec, this command is an
optional command and MR firmware is rejecting this command as unsupported
(Write back is enabled only when battery is available and MR firmware do flush
cache frequently). Looks like OS do not like rejecting the command on a boot
volume and so adding the following event message to the event log each time the
call is failed. These messages are flooded by OS and is causing annoyance to
the user.

1. As this is within the SCSI compliance, we would like the OS should handle
the failure case more gracefully.

2. Shouldn't the OS stop sending the sync cache cmd if it sees it is "Failed"
with "Invalid Command" in sense info ?

Message from the log :

Jan 12 17:58:06 linux-nxso kernel: FAILED
Jan 12 17:58:07 linux-nxso kernel: status = 1, message = 00, host = 0, driver
= 08
Jan 12 17:58:07 linux-nxso kernel: <6>sd: Current: sense key: Illegal Request
Jan 12 17:58:07 linux-nxso kernel: Additional sense: Invalid command
operation code

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