[Bug 244864] New: megaraid_sas : critical bug fix
https://bugzilla.novell.com/show_bug.cgi?id=244864 Summary: megaraid_sas : critical bug fix Product: SUSE Linux 10.1 Version: Final Platform: Other OS/Version: Other Status: NEW Severity: Critical Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: sumant.patro@lsi.com QAContact: qa@suse.de CC: rbowns@novell.com This is with ref to SLES 10 SP1. It has the following two critical bug fixes for megaraid_sas driver : 1. Under heavy IO mid-layer prints "DRIVER_TIMEOUT" errors that leads to aborted journal entries -> volume mounted "Read Only" error for ext3 file system. Fix: The driver is now throttling IO. "DRIVER_TIMEOUT" is printed by the mid-layer when # of retries becomes equal to max_allowed. Checks added in megasas_queue_command to know if FW is able to process commands within timeout period. If number of retries is 2 or greater,the driver stops accepting cmds from OS (thus cmd to FW is temporarily stopped). IO is resumed if pending cmd count reduces to 16 or 10 seconds has elapsed from the time cmds were last sent to FW. 2. Ref : BZ # 242063. megaraid_sas FW enables WCE bit in Mode Sense cmd for logical drives that are configured as WriteBack. The OS may send "SYNCHRONIZE_CACHE" cmd when Logical Disks are exposed with WCE=1. User is advised to enable Write Back mode only when the controller has battery backup. At this time Synhronize cache is not supported by the FW. Driver will short-cycle the cmd and return sucess without sending down to FW. Without this fix we have seen 20-25% performance hit. These changes have been verifed by both LSI & OEM. Please accept this patch for SLES 10 SP1. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
https://bugzilla.novell.com/show_bug.cgi?id=244864 ------- Comment #1 from sumant.patro@lsi.com 2007-02-12 16:54 MST ------- Created an attachment (id=118748) --> (https://bugzilla.novell.com/attachment.cgi?id=118748&action=view) megaraid_sas driver critical bug fix (volume mounted readonly ..) -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is.
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