Date: Tue, 26 May 2009 12:18:56 -0700 (PDT) From: John Kozubik <john@kozubik.com> To: freebsd-fs@freebsd.org Subject: Improving fsck With Regard to Bad Cylinder Groups Message-ID: <20090526120802.G94647@kozubik.com>
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Friends, Kirk McKusick did some miscellaneous consulting for me earlier this year, and new fsck functionality was the unexpected result. Briefly: A filesystem with bad cylinder groups would cause messages like: fsck_ffs: cannot alloc 275829428 bytes for inoinfo to be output by fsck, and dumpfs (before dumping core) would show cylinder groups with obviously out of bounds data. There were some patches floating around that added a '-D' option to fsck, giving it the ability to repair cylinder groups. However these patches were not implemented properly, and their use would only compound your problem. Now, there is a patch added to CURRENT that makes cylinder group repair "one of the standard things that fsck does when running in manual (non-preen) mode." So the non-standard '-D' switch is no longer required. Full details are here: http://blog.kozubik.com/john_kozubik/2009/05/improving-fsck-with-regard-to-bad-cylinder-groups.html and it should be noted that if you are not CURRENT, or if you need a 6.x i386 binary with this functionality immediately, you can find it here: http://www.kozubik.com/binaries/freebsd/2009-01-00-freebsd_intermediate_fsck_fixes_cylinder_group_maps This intermediate binary has the working (albeit preliminary) cylinder group repair code, and unlike the final product WILL require the "old" '-D' switch to enable it. ----- John Kozubik - john@kozubik.com - http://www.kozubik.com
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