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Message-ID: <20140720040824.GA10571@pyropus.ca> Date: Sat, 19 Jul 2014 22:08:24 -0600 From: Charles Cazabon <charlesc-linux-ext4@...opus.ca> To: Azat Khuzhin <a3at.mail@...il.com> Cc: "open list:EXT4 FILE SYSTEM" <linux-ext4@...r.kernel.org> Subject: Re: Delayed block allocation failures after shrinking fs Azat Khuzhin <a3at.mail@...il.com> wrote: > On Sun, Jul 20, 2014 at 2:39 AM, Charles Cazabon <charlesc-linux-ext4@...opus.ca> wrote: > > > > space. Shrinking a formerly-full filesystem from several TB to a few hundred > > GB is probably not a case that gets tested a lot, I would guess. > > I've also used resize2fs for shrinking the fs, but with extra padding. I also left the LVM volume ~20GB bigger than I had shrunk the filesystem to, as I didn't want to risk corrupting the filesystem. This should have been sufficient to take care of the 2^30 vs 10^9 confusion and other slack. > I'm not sure about this, but if you could test shrinking with extra > padding, maybe it will help to avoid that errors, and also it would help > find the place where the problem is (if it is still there?). I'm not entirely sure what you mean. Is it that you think I didn't leave sufficient room for the fs? > And one question for you, do you have bigalloc option enabled? I have to confess I'm not familiar with that option. When creating ext4 filesystems I generally use dir_index, extent, flex_bg, sparse_super, and uninit_bg. The shrunken filesystem shows this from tune2fs -l: Filesystem UUID: bdf98430-a81c-4a92-9d81-e259a6aeec5b Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: clean with errors Errors behavior: Continue Filesystem OS type: Linux Inode count: 19660800 Block count: 78643200 Reserved block count: 7864 Free blocks: 7300885 Free inodes: 19657174 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 1005 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 RAID stride: 32 RAID stripe width: 128 Flex block group size: 16 Filesystem created: Mon Jun 6 07:06:52 2011 Last mount time: Tue Jul 15 21:34:45 2014 Last write time: Thu Jul 17 16:17:19 2014 Mount count: 3 Maximum mount count: 22 Last checked: Tue Jul 15 20:29:52 2014 Check interval: 15552000 (6 months) Next check after: Sun Jan 11 20:29:52 2015 Lifetime writes: 19 TB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: 9d433555-1436-4e13-8486-3b5cb1349e91 Journal backup: inode blocks FS Error count: 1127 First error time: Tue Jul 15 21:48:31 2014 First error function: ext4_ext_search_left First error line #: 1423 First error inode #: 2648 First error block #: 0 Last error time: Thu Jul 17 16:17:19 2014 Last error function: ext4_ext_search_left Last error line #: 1423 Last error inode #: 2662 Last error block #: 0 Charles -- ------------------------------------------------------------------ Charles Cazabon <charlesc-linux-ext4@...opus.ca> Software, consulting, and services available at http://pyropus.ca/ ------------------------------------------------------------------ -- 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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