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Message-ID: <49E8B5AD.6030907@redhat.com> Date: Fri, 17 Apr 2009 12:00:29 -0500 From: Eric Sandeen <sandeen@...hat.com> To: Jeremy Sanders <jss@....cam.ac.uk> CC: linux-ext4@...r.kernel.org Subject: Re: fsck.ext4: Group descriptors look bad... trying backup blocks... Jeremy Sanders wrote: > Hi - I'm trying out ext4 on a large 8.2 TB software raid device (md). On > rebooting (cleanly unmounting), I tried an fsck on the device. I get the > following: > > [root@...ck2 ~]# fsck /dev/md0 > fsck 1.41.4 (27-Jan-2009) > e2fsck 1.41.4 (27-Jan-2009) > fsck.ext4: Group descriptors look bad... trying backup blocks... > Group descriptor 0 checksum is invalid. Fix<y>? > > It then finds lots of bad group descriptors. > > This is Fedora 10, 2.6.27.21-170.2.56.fc10.x86_64 and > e2fsprogs-1.41.4-4.fc10.x86_64. > Jeremy, if you're willing, could you upgrade to the 2.6.29 kernel that's in F10 updates-testing? That way the ext4 code is a bit more of a recent, common codebase. Also, if this is a test fs, re-mkfs'ing from scratch might not be a bad way to go. Depending on how hard it is to reproduce, it may also be interesting to try a filesystem just shy of 8TB (2^31) blocks in case there is some 32-bit wrap-around there, since you're at 8.2T.... -Eric -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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