On Sun, Sep 9, 2012 at 9:53 PM, Terry <td3201@xxxxxxxxx> wrote: > On Sun, Sep 9, 2012 at 9:47 PM, Theodore Ts'o <tytso@xxxxxxx> wrote: >> On Sun, Sep 09, 2012 at 09:34:10PM -0500, Terry wrote: >>> >>> As the subject says, we have a 15 TB fsck drive that won't mount with >>> these errors: >>> >>> Sep 9 20:02:20 narf kernel: EXT4-fs (dm-9): ext4_check_descriptors: >>> Inode bitmap for group 3200 not in group (block 4161027887)! >>> Sep 9 20:02:20 narf kernel: EXT4-fs (dm-9): group descriptors corrupted! >> >> These indicate a very basic file system corruption where the block >> group descriptors are corrupted. E2fsck will complain immediately >> upon seeing this sort of fs inconsistency, and the first thing it will >> try to do is fix it. >> >>> We did a proactive fsck on Tuesday of last week because it was >>> starting to give filesystem errors. It ran through and mounted fine. >>> >>> The filesystem lives on an equallogic SAN spread across 36 drives. >>> Could this be something with the physical layer or is it not abnormal >>> to have to run multiple rounds of fsck to fully fix an issue? >> >> This is most probably a hardware problem; normally e2fsck will fix >> file system corruptions (and certainly problems such as corrupt block >> group scriptors) in a single pass. If e2fsck finished and the file >> system mounted fine last week, and now you're getting this kind of >> error, it basically screams some kind of physical layer problem, or >> perhaps a bad hard drive, or perhaps the SAN disk is getting >> incorrectly written to by some other system, etc. >> >> - Ted > > Thanks for the reply. It is part of a RHEL cluster but we did not > have any situations where multiple systems mounted the filesystem. It > is a an old SAN so perhaps we have a physical issue. We'll see what it > happens with this pass. While I am waiting for fsck to finish, another thought. This filesystem contains a lot of small files. 35,867,642 files to be exact. Anything else I should check or know to ensure a smooth operation for these types of filesystems? I formatted them with standard RHEL 6 options. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
