Thousands of "unattached inode" entries freezing fsck Post: 302178607

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Top Forums UNIX for Advanced & Expert Users Thousands of "unattached inode" entries freezing fsck Post 302178607 by nothsa on Wednesday 26th of March 2008 02:35:42 AM

03-26-2008

Registered User

Thousands of "unattached inode" entries freezing fsck

We have some CentOS systems with ext3 filesystems that (on occasion) experiences long power failures that are longer than the UPS can handle. We run an fsck on the file systems at every boot, and sometimes they will come back on after a power failure, and when fsck runs there are tens of thousands of "unattached inode" entries:

Code:

Inode ##### ref count is 1, should be 2. Fix? yes
Unattached inode ##### Connect to /lost+found? yes

Where ##### is a different number for each entry. (I've set fsck to answer 'yes' to all questions, hence the "yes"es for the two lines, but I have also tried setting it to answer "no" to all questions). The problem is that it will go through about 7000-8000 of these entries, and then freeze, like it's reached some kind of limit and doesn't want to process any more entries. At this point, someone has to reboot it and it goes to another 7000-8000 before it has to be rebooted again. I'm pretty certain that this is not a hard drive fault because this has happened across 20 different systems and 20 different hard drives.

Does anyone have any ideas:
a) what might be causing the problem, and how to get around it, and
b) what I can do to fix/avoid it without any human intervention? Possible change filesystems, or something else?

I don't want any of these unattached files as I am sure they are just temporary files, so I don't have a problem with just dumping them all. I just can't find a way to do that =/

nothsa

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LEARN ABOUT SUNOS

systemd-fsck

SYSTEMD-FSCK@.SERVICE(8)				       systemd-fsck@.service					  SYSTEMD-FSCK@.SERVICE(8)

NAME

       systemd-fsck@.service, systemd-fsck-root.service, systemd-fsck - File system checker logic

SYNOPSIS

       systemd-fsck@.service

       systemd-fsck-root.service

       /lib/systemd/systemd-fsck

DESCRIPTION

       systemd-fsck@.service and systemd-fsck-root.service are services responsible for file system checks. They are instantiated for each device
       that is configured for file system checking.  systemd-fsck-root.service is responsible for file system checks on the root file system, but
       only if the root filesystem was not checked in the initramfs.  systemd-fsck@.service is used for all other file systems and for the root
       file system in the initramfs.

       These services are started at boot if passno in /etc/fstab for the file system is set to a value greater than zero. The file system check
       for root is performed before the other file systems. Other file systems may be checked in parallel, except when they are on the same
       rotating disk.

       systemd-fsck does not know any details about specific filesystems, and simply executes file system checkers specific to each filesystem
       type (/sbin/fsck.*). This helper will decide if the filesystem should actually be checked based on the time since last check, number of
       mounts, unclean unmount, etc.

       If a file system check fails for a service without nofail, emergency mode is activated, by isolating to emergency.target.

KERNEL COMMAND LINE

       systemd-fsck understands these kernel command line parameters:

       fsck.mode=
	   One of "auto", "force", "skip". Controls the mode of operation. The default is "auto", and ensures that file system checks are done
	   when the file system checker deems them necessary.  "force" unconditionally results in full file system checks.  "skip" skips any file
	   system checks.

       fsck.repair=
	   One of "preen", "yes", "no". Controls the mode of operation. The default is "preen", and will automatically repair problems that can be
	   safely fixed.  "yes" will answer yes to all questions by fsck and "no" will answer no to all questions.

SEE ALSO

       systemd(1), fsck(8), systemd-quotacheck.service(8), fsck.btrfs(8), fsck.cramfs(8), fsck.ext4(8), fsck.fat(8), fsck.hfsplus(8),
       fsck.minix(8), fsck.ntfs(8), fsck.xfs(8)

systemd 237														  SYSTEMD-FSCK@.SERVICE(8)