Processes stuck in D state..

[Gordon Henderson <gordon@drogon.net>]

I am running a few production servers with XFS now, but I'm a little
concerned... (as I'm seeing some problems)

Anyway, I'm using the -ac4 patches to 2.4.21 with the 1.2 release of the
xfsprogs and with overnight cron "stuff", (eg. amanda)  I get a bunch of
processes hanging in the "D" state. Eg. xfsdump. This doesn't inspire
confidence. Right now I'm seeing:

 1149 ?        D      2:20 xfsdump -F -J -l 1 - /dev/md4
 9275 ?        D      2:02 du -k
10103 ?        D      2:26 /usr/bin/find / ( -fstype NFS -o -fstype nfs -o
21671 ?        D      1:28 /usr/bin/rsync -a --delete -H -x . /mounts/local0.yesterday/
13976 ?        D      1:16 du -k
14776 ?        D      1:59 /usr/bin/find / ( -fstype NFS -o -fstype nfs -o

which isn't good. A few days ago I had a bunch of nfsd's stuck in D state
too which required a reboot - which in a busy working environment isn't a
good thing )-:

Is XFS really ready for production?

I'm faced with migrating this box back to ext2 and hoping we never get a
powerfail (it's on a big UPS, but there is a limit!) as it has 2 x 160GB
partitions which I can live without the fsck time... (and this is just the
start, I have another half terabyte server with XFS too - I shudder to
think of the fsck time on that!)

Any clues other than "get the latest CVS patches"?

Gordon