[sam-qfs-discuss] Random QFS mount hang

[Bryan Collins]

Hi all,

We've been running a SAM/QFS shared client environment here for a couple of years now, without any major dramas.

However, I have noticed an issue where a QFS client will not mount a filesystem and leave the mount process hanging in the background.

MDS is V490 Solaris9, 4.6.25
QFS Client is 480R Solaris9 4.6.25

The client has 5 QFS filesystems, all mounted fine after reboot except for 1.

The mount process is hung.
    root   428     1  0   Jul 01 ?        0:00 mount -o shared,bg,sync_meta=1,meta_timeo=5,stripe=0,mm_stripe=1 pandoraaccess

Cant kill it (even -9 does nothing), truss shows absolutely 0 activity.
pstack shows nothing too
428:  mount -o shared,bg,sync_meta=1,meta_timeo=5,stripe=0,mm_stripe=1 pando
 00000000 ???????? (0, 0, 0, 0, 0, 0)

I cant temporarily mount the filesystem via NFS as the mountpoint is being used on the system (device busy error from mount).

On the MDS side of things, tracing is enabled and I can see the sam-sharefsd start up a thread for that filesystem/client combo.

I am going to give the client a reboot later tonight outside business hours, but I'd like to know if theres another way of knocking
off this mount process so I can gain access to the filesystem on the client.
I'd also like to hear if anyone else has come across this situation?
I am confident that everything is configured and running properly, as this setup doesn't change and its been in production for a couple of years (with the odd patch update and a regular monthly reboot).

Thanks
Bry