Solaris 9 mounting a Solaris 8 NFS server

From: Gavin Kelman (gavin@metahusky.net)
Date: Wed Nov 06 2002 - 11:16:55 EST


Our V880 with Solaris 9 and the latest patch cluster installed, mounts
our Solaris 8 file server. The Solaris 8 box is probably about 3 months
behind the latest patch cluster (always on, planned maintenance is rare).

/srsdata sits on a t3 attached to the solaris 8 box.

The Solaris 9 box has been up and running for about 4 days now mounting
/srsdata on the Solaris 8 box. Today, people on other machines (we have
Irix, tru64, hp-ux, linux, solaris 7 & 8) complain that /srsdata is
impossibly slow to write to. Reading is fine, writing is so slow, touching
a file there takes about 45 seconds. The same is true if done locally on
the fileserver itself, avoiding NFS.

I spent a good 2 hours watching NFSOPS, 800-1000 at this time of day,
totally normal. I checked syslog, dmesg, and vxdiskadm for errors on failed
disks or similar, and nothing seemed amiss. In desperation, I unmounted
/srsdata from the solaris 9 box, and suddenly everything returns to normal.
/srsdata becomes fast to write to again.

What's going on? Why is our Solaris 9 box effectively Denial Of Servicing
our Solaris 8 file server? I'm about to get in touch with Sun about this,
but wondered if anyone had any ideas what's going on....

Cheers,
Gavin.

-- 
Gavin Kelman               Phone : 07967 360 822
Systems Administrator      Email : gavin@metahusky.net
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