Dear All
My Linux server version is
Red Hat Enterprise Linux Server release 5.7 (Tikanga)
It's a Virtual server. It's a file server & nfs mount in other servers from this server.
We Found that we are not able to open any new session
/ver is 100% ... our team restarted this virtual server - but server is not coming up.
1.How can I solve this ?
2. This is a file server & we have nfa mount in other servers from this server.
in all those servers df -h got hung & even ll from /
is also hang. Commented(#) nfs mount from /etc/fstab
still same issue.How can I solve this ?
Is there any way to solve it without restarting server?

Thanks

It's behind 3 updates as RHEL-5 has been at U10 for some time now.


Why just reboot? What would that solve? Reboot into runlevel 1 then investigate.


24/7 monitoring and timely preventive maintenance I'd say ;-p

If /, /var, or /usr get 100% full, no new files can be created on them, which can cause all sorts of problems (e.g. many programs put a lock file in /var/run -- if that directory can't be written to, some of them will refuse to start). The solution is to figure out why /var got filled up, and as unSpawn said, take measures to rpevent it from happening again.

When an NFS server goes down, clients with its shares mounted will generally have df hang until the server is available again or the NFS volume is forcibly unmounted (not recommended!).

How to rescue a KVM http://linux.dell.com/files/whitepap...Easy_Part2.pdf
Use that to purge /var, then find out why it happened after you get it back up and running. EG look into logrotate settings, or possibly a runaway process filled the /var.
Before you purge the disk, try to figure out which logs/prog was at fault eg take a file list.