Re: AIX 5.2 ls command hanging on JFS2 FS

From: Michael E. Thomadakis (miket_at_hellas.tamu.edu)
Date: 08/31/04

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    Date: Mon, 30 Aug 2004 20:03:32 -0500

    On Mon, 30 Aug 2004, Jurjen Oskam wrote:

    j| Date: 30 Aug 2004 19:12:52 GMT
    j| From: Jurjen Oskam <joskam@quadpro.stupendous.org>
    j| Newsgroups: comp.unix.aix
    j| Subject: Re: AIX 5.2 ls command hanging on JFS2 FS
    j|
    j| On 2004-08-30, Michael E. Thomadakis <miket@hellas.tamu.edu> wrote:
    j|
    j| > I few days ago we've noticed a strange behavior on our p690 system (running
    j| > 5.2 with all the patches as of end of july 2004 applied). Command
    j| > ls -l on a JFS2 file system was hanging indefinitely.
    j|
    j| Should that happen again, try doing the same command again on another terminal,
    j| but this time trace it with the truss command. Then you'll know exactly where
    j| it hangs.

    OK, I will do this.

    j|
    j| You said you restored an mksysb when this happened earlier. Was the filesystem
    j| that caused the hang wiped and recreated? (And I don't mean rm -rf wiped, I
    j| crfs wiped.) If not, the cause *might* be a corrupted filesystem. Restoring
    j| the mksysb might not have fixed anything in that case. I'd unmount the
    j| filesystem and fsck it thorougly.

    That FS is a JFS2 that is not part of rootvg. I've also suspected that the
    JFS2 FS needed fsck.

    j|
    j| > Another questions relates to failed autofs mounts from a 'crappy' NFS server.
    j| > We had to mount an automaounted FS from an unstable NFS file server. When the
    j| > server failed (and was restarted) the previously automounted FSs could not be
    j|
    j| What mount options were used? In the case of NFS, some options can result in
    j| unkillable hung processes when the server is unreachable/unavailable.

    I always use the intr,bg,wsize= ,rsize =

    I want to mention that after the crappy NFS server had to be restarted the
    entire autofs tree would not mount / umount anything. I was trying to force
    umounts but the umount command was getting stuck.

    Any idea on how to umount FSs from a dead NFS server, when losing data is OK.

    Thanks
    Michael

    j|
    j| --
    j| Jurjen Oskam
    j| "I often reflect that if "privileges" had been called "responsibilities" or
    j| "duties", I would have saved thousands of hours explaining to people why
    j| they were only gonna get them over my dead body." - Lee K. Gleason, VMS sysadmin
    j|

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