NVRAM: Unable to read configuration. Try again later.

Question

Hi,
I have built a 3750 switch stack (8 switches) and every now and then (random) when i do a "show run" or "write mem", i get the following error message
NVRAM: Unable to read configuration. Try again
It doesn't happen all the time, its a random thing. I'm currently using c3750-ipservicesk9-mz.122-53.SE2.bin.
I have checked the memory and there's a lot of free memory. I am the only person consoled onto the stack. I did reboot the stack but its an intermittent problem.
Anyone encountered this issue before?

Answer 1

I have noticed the same problem when working on larger 3750 and 3750X stacks on several different code levels.  I applied the "DEBUG CONFIGURATION LOCK" command and was able to duplicate the problem.  I shut down and unused interface and tried to write the configuration and got the messages below:
May 25 00:09:55: Parser: - Config. Lock requested by process <342> client
May 25 00:09:55: Parser: - Config. Lock acquired successfully !
May 25 00:09:55: Parser: -  Config. SHARED UnLock requested
May 25 00:09:55: Parser: - Config UNLOCKED !
May 25 00:10:08: Parser: - Config. Lock requested by process <342> client
May 25 00:10:08: Parser: - Config. Lock acquired successfully !
May 25 00:10:08: Parser: -  Config. SHARED UnLock requested
May 25 00:10:08: Parser: - Config UNLOCKED !wr
May 25 00:10:15: Parser: - Config. Lock requested by process <342> client
May 25 00:10:15: Parser: - Config. Lock acquired successfully !
May 25 00:10:15: Parser: -  Config. SHARED UnLock requested
May 25 00:10:15: Parser: - Config UNLOCKED !end
Stack-1#wr
May 25 00:10:17: %SYS-5-CONFIG_I: Configured from console by tkazee on vty0 (10.65.128.62)
May 25 00:10:20:  Exec command locking feature is not enabled.
NVRAM: Unable to read configuration. Try again later.
Stack-1#
The problem appears to be related to the "SSH Process".  You are not alone.