[zfs-discuss] Unlistable files

Richard Elling richard.elling at richardelling.com
Fri Apr 6 00:42:02 EDT 2018


> On Apr 5, 2018, at 1:34 PM, Vladimir Brik via zfs-discuss <zfs-discuss at list.zfsonlinux.org> wrote:
> 
> Hello.
> 
> I have run into a strange issue where files don't show up in directory
> listing but can be accessed by path directly. I wonder if somebody knows
> what might have caused this.
> 
> # find dst/a/foo
> dst/a/foo
> (as expected)
> 
> # find dst/a/ -name foo
> (no output)

this can occur if you don’t have read permission on the directory
ls -ld dst/a

  -- richard

> 
> # ls -l dst/a/foo
> -rw-r--r-- 1 xxx xxx 5991051 Feb 22 13:35 dst/a/foo
> (as expected)
> 
> # ls -l dst/a/ | grep foo
> (no output)
> 
> # cp dst/a/foo bar
> (this works; bar is created and can be listed)
> 
> The problem occurs when I run something like "cp -r src dst", where src
> is a directory with 12 sub-directories with 6999 files each, about 84K
> files total, 2.9TB. After copy finishes, dst is missing several thousand
> files according to find. (Similar thing happened when I tarred src and
> then unpacked it in a different location; according to tar --list the
> tarball contained all files.)
> 
> The cp command reported "No space left on device" for a couple of files.
> The filesystem has about 80TB free (zpool is about 50% full). The files
> for which "No space left on device" error was generated just weren't
> created, it seems, but other missing files are accessible by their full
> path but did not show up in directory listings (as shown above).
> 
> ls is reporting some sub-directories of dst have 7000 hard links instead
> of 7001 that the sub-directories in src have. All missing files seem to
> be from such sub-directories.
> 
> After rebooting the server, the missing were no longer accessible by
> full path.
> 
> It seems the problem is reproducible. Missing files are not always the same.
> 
> I am running ZFS 0.7.7, Scientific Linux release 6.8. No ZFS snapshots.
> 
> If anybody can shed light on this, I would really appreciate it :)
> 
> 
> Vlad
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