Messages in this thread | | | From | Andreas Dilger <> | Date | Thu, 31 Oct 2002 01:07:17 -0700 | Subject | Re: Htree ate my hard drive, was: post-halloween 0.2 |
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On Oct 31, 2002 07:27 +0100, Duncan Sands wrote: > > EXT3 Htree support. > > ~~~~~~~~~~~~~~~~~~~ > > The ext3 filesystem has gained indexed directory support, which offers > > considerable performance gains when used on filesystems with large > > directories. In order to use the htree feature, you need at least version > > 1.29 of e2fsprogs. Existing filesystems can be converted using the command > > "tune2fs -O dir_index /dev/hdXXX" The latest e2fsprogs can be found at > > http://prdownloads.sourceforge.net/e2fsprogs > > I ran this (tune2fs -O dir_index /dev/hdXXX). > > After a bit of switching back and forth between 2.4.19 and 2.5.44, > fsck was run while booting 2.4.19 (the usual check because of >30 > mounts). There was a message about optimizing directories. Booting > continued but (big surprise) X refused to run. It turned out that some > device files had vanished. Very strange. On rebooting, fsck found a > gazillion bad inodes. They all turned out to be from the 2.5.44 tree - > poetic justice I suppose! But this did not suffice. Rebooting, I got > "optimizing directories" again. Next fsck showed up more dud inodes. > After a few cycles of this, I ran > > tune2fs -O ^dir_index /dev/hdXXX > > to remove htree support. No problems since then. > > tune2fs 1.30-WIP (30-Sep-2002)
I wonder if there is still a bug in the e2fsck code for re-hashing directories? It shouldn't be possible to have e2fsck complete and there still be an error in the filesystem (ok, sometimes it happens, but in those cases it spews a lot of warnings about the filesystem not being fixed yet and to run manually).
What else is strange (at least to me) is e2fsck "optimizing directories" on a reboot. My understanding at least is that this would be done only when explicitly asked for, otherwise it might slow down booting a lot, and as you can see it adds to the possibility of corrupting the fs when e2fsck should only be fixing it.
Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
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