I've a server with a very similar problem to this. Running a dd on the /var file system always gives a SCSI error at the same spot. An fsck will fix the filesystem without errors but it will always get remounted as read only after a short while. I'd assumed a disk/controller problem but at the raid card firmware and bios level, no disk errors are logged. Disks have been rescanned for bad blocks with no errors reported. It has 6 disks in a RAID 5 array. IBM 3650 with Serveraid 8K controller. Redhat 5.3 with latest patches. Regards Geoff -----Original Message----- From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] On Behalf Of Gaute Lund Sent: Tuesday, 28 April 2009 11:52 AM To: linux-lvm@redhat.com Subject: Random file system errors I have searched the web and the mailing list without finding anything similar to this. At home I have an LVM setup. Reading data gives random errors. I only recently discovered it's an LVM issue. I think. The issue: If I md5sum largeish files, or test archives, I sometimes get errors or randomly different md5sums. Like now, I have 11 folders, all with rar files in parts: some 300 15MB pieces in 6 folders/sets, totaling 4,2GB, and 560 50MB pieces in 5 folders/sets, totaling 23G. OK, so I "rar t" all of these 5 times over. Errors pop up randomly, 52 times in the 50MB pieces, 10 times in the 15MB pieces. That's about 1 error for every 2,1GB of data read. Md5suming multiple files gives about the same error rate. If I run repeated test on a rar set small enough to fit in cache mem, I get errors, but they are indentical with each run. Is it really an lvm problem? Well, I have created new LVs and use different filesystems, ext3, xfs, jfs - they're all the same. If I create an md on some other disks, and put a filesystem on it, without LVM, no problems. I can't find any other errors, in any logs or dmesg. The errors weren't there to begin with, they came at one point and got worse. It took a while before I realized it was a generic disk problem, and for a period I kind of gave up on it. So it's been there for ... maybe six months? The VG consist of two software RAID 5 md's, one consisting of four 200GB IDEs, one of five 500GB SATAs, yielding av VG totaling 2,37TB. Other hardware is 4GB memory and a Core 2 Duo 6600 CPU. Machine runs Ubuntu 8.10 with kernel 2.6.27-11, and LVM version: 2.02.39 (2008-06-27) Library version: 1.02.27 (2008-06-25) Driver version: 4.14.0 But the VG was originally created long ago, on LVM1 even. Well, I guess that's it. Any other information that could be helpful? Any way I could debug this? Best regards Gaute Lund _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ This is an email from Fujitsu Australia Limited, ABN 19 001 011 427. It is confidential to the ordinary user of the email address to which it was addressed and may contain copyright and/or legally privileged information. No one else may read, print, store, copy or forward all or any of it or its attachments. If you receive this email in error, please return to sender. Thank you. If you do not wish to receive commercial email messages from Fujitsu Australia Limited, please email unsubscribe@au.fujitsu.com _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
