Messages from megasas driver logged after upgrade

Products

• Messaging Gateway

Issue/Introduction

After upgrading Messaging Gateway (SMG) to 10.6.2-7, kernel level messages from the RAID system are logged to the messages log regarding RAID initialization and cache write status.

messages:
2016 Nov  8 14:11:33 (err) kernel: megasas:IOC Init cmd success
2016 Nov  8 14:11:33 (err) kernel: megasas: INIT adapter done
2016 Nov  8 14:11:33 (err) kernel: sd 11:0:0:0: [sdb] Assuming drive cache: write through
2016 Nov  8 14:11:33 (err) kernel: sd 11:0:0:0: [sdb] Assuming drive cache: write through
2016 Nov  8 14:11:33 (err) kernel: sd 11:0:0:0: [sdb] Assuming drive cache: write through

Cause

The first two messages are logged at an incorrect level by the megasas driver and should instea be logged at INFO level.

The drive cache messages indicate that the kernel was unable to detect the cache write properties of the disk hardware and is defaulting to write through as the policy. This is logged at error level since for some disk drives this is an incorrect setting but for the drives used in SMG, write through is the appropriate drive cache setting.

Resolution

These messages may be safely ignored.