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Your disk is simply full. Although the system reserves some space for root in order to operate the system, processes are most likely not able to allocate enough resources and slow down the system. I'm pretty sure the system will come to an end soon. You will need to find out what is taking 440 GB of space on your server.
If the server is still responding you can try the following command to get started, otherwise you will need to dig in manually.
du -sh /*
Thanks for the reply.. After executing command "du -sh /* " came to know that one of the directory is used to keep backup files of size 125G. I have removed it and now 54% of the space is available for use..
How can we increase performance of the server at OS level ? like are there any tasks which we need to perform periodically ??
Edited by: Priyanka Pawar on Jul 31, 2012 3:18 PM
The system normally already performs some periodic maintenance tasks. You can check ls /etc/cron* for more details. Otherwise, addressing performance depends on your hardware and software configuration, expectation and use. It will require a lot more details to be able to make any recommendation.
In your case it seems that checking that your system does not run out of disk space is a critical issue.
Perhaps you will find the following helpful. I provided a script that will monitor disk space and email you when it reaches a defined threshold. You can add it to your cron configuration.
Disk Space monitoring in unix