AIX

Hi friends,

I have a IBM machine loaded with AIX-5.3. The RAM is 350GB and have a swap space of 130GB. For the past 2 days, machine gets almost hanged in the morning and was able to login only from HMC console.... While issuing any commands from this console..even df, it shows the following error :

Error: The fork function failed. There is not enough memory available

AIX LEVEL :5300-10-01-0921

The machines works fine after restart...but the next day morning, it again hangs...

When i checked topas yesterday, after 3-4 hours of restart,....i could see the follwing as the top process... kdb_64....

what is this kdb_64... I doubt..weather this is consuming my RAM so that system is in shortage of memory......

What is the resolution for this situation....

Thanks in advance for the helps

Regards,
Jibu

the process is the kernel debugger and its very unlikely that its eaten your memory.
You seem to have a huge DB box I guess - what is

Code:

 ipcs -a

saying and vmstat -Iwt 2 10 say 1 hr after reboot ?
If this is AIX 5.3 - do you have lru_file_repage set to 0 or 1 ?
If you have the problem overnight - I guess when batches or backups running - see if system improves when you are mounting your dumpdevice with rbrw option.
Regards
zxmaus

Hi,

Thanks for the reply.

It was a cronjob running at night that caused memory utilization to be heavy..... I commented it and machine is running fine now....

kdb_64 comes when perpmr is enabled ..... i disabled it and is not there now..

Regards,
jibu