Hi DBA's
I have sybase 11.5 running on NCR MRRAS Unix server

For some reason the database backup is not happening.
We get this message:

Aug 28 02:05:00 2004: Backup Server: 4.41.1.1: Creating new disk file /bucket1/db_dump/str/strdb.gtl5.Sat.
Aug 28 02:05:00 2004: Backup Server: 4.142.2.58: [0] The 'shmget' call failed with error number 28 (No space left on device). Refer
to your operating system documentation for further details.
Aug 28 02:05:00 2004: Backup Server: 4.6.2.1: Failed to create or attach shared tape i/o buffers.

We restarted the server - both backup server and sybase, even restarted the unix server
The problem still persists
We increased the shared memory and restarted server, we now get this message
Sep 1 00:11:31 2004: Backup Server: 4.141.2.37: [2] The 'write' call failed for device '/bucket1/db_dump/fin/findb.gtl5.Wed' with error number 9 (Bad file number). Refer to your operating system documentation for further details.
Sep 1 00:11:31 2004: Open Server Error: 16238.10.0: srv_rpcname: Invalid result type(1002) for event(2)

Each of our database sizes is not more than 1 GB

I nead help on this, is there a formula for calculating shared memory.
How do I fix this problem

When I run ipcs this is what is displayed, I notice no sybase components are listed
laki$ ipcs -ma
IPC status from /dev/kmem as of Wed Sep 1 09:11:35 2004
T ID KEY MODE OWNER GROUP CREATOR CGROUP NATTCH SEGSZ CPID LPID ATIME DTIME CTIME
Shared Memory:
m 100 0x350018c7 -Crw-rw-rw- root root root root 7 2097152 358 7791 0:00:22 0:00:26 23:53:09

This is urgent, Need detailed help on this

TIA
lakshmi