Switching off the directio in megaraid's setup to cacheio should help. It's controller's (32bit) problem not drivers. On Fri, 2006-02-10 at 11:26 -0800, Andrew Morton wrote: > > Begin forwarded message: > > Date: Fri, 10 Feb 2006 10:19:45 -0800 > From: bugme-daemon@xxxxxxxxxxxxxxxxxxx > To: bugme-new@xxxxxxxxxxxxxx > Subject: [Bugme-new] [Bug 6052] New: Megaraid file corruption and performance degradation on x86_64 with 8G RAM > > > http://bugzilla.kernel.org/show_bug.cgi?id=6052 > > Summary: Megaraid file corruption and performance degradation on > x86_64 with 8G RAM > Kernel Version: 2.6.15-1.2005_FC4smp > Status: NEW > Severity: normal > Owner: andmike@xxxxxxxxxx > Submitter: bloch@xxxxxxxxxxxx > > > Most recent kernel where this bug did not occur: > Distribution: > Fedora Core 4 > > Hardware Environment: > > Tyan S2882 > 2 x Opteron 252 > 8G RAM > LSI MegaRAID SATA 150-4 > > Software Environment: > > Problem Description: > > A RAID1 mirror was setup using the MegaRAID card and 2 x 250 GB drives. > After only a day or so of use, there was severe filesystem corruption (using > ext3) and the user complained that even before the corruption it was incredibly > slow (the mirror is used to house $HOME). > > We have other machines here with only 4G RAM using the same card and setup. > Performance there is fine and there's been no filesystem corruption. > > In one case I removed the drives from the card and connected them to the SATA > ports on the motherboard, using software RAID. That machine is working fine. > > In the other case I have tried using a Fedora test kernel, equivalent to > 2.6.16-rc2, which has the latest version of the MegaRAID driver (2.20.4.7). > I was unable to recover the filesystem on the original partition when running > fsck using the new kernel. However, at least on this occasion fsck kept running > (for two days...) instead of crashing. > > When running mkfs on the hardware RAID1 mirror, performance still seems to be > very slow. > > Hence it appears there is a specific problem with the LSI megaraid driver on > x86_64 machines with more than 4G RAM. > > Steps to reproduce: > > ------- You are receiving this mail because: ------- > You are on the CC list for the bug, or are watching someone who is. > - > : send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
