to recover the swap memory

Fri Feb 2 13:53:22 UTC 2007

Good morning,

One item that I notice, is that the swap memory should be at least 1 ½ times the amount of RAM you have.  I personally set my systems up with 2 times the amount of RAM or in your case at least 4 GB.  This will help keep your system from freezing or hanging.  As far as recovering the system after a hang up, I'm not aware of anything other than a reboot.

Sincerely,

Lee Higginbotham

Lee Higginbotham

Senior IT Technical Analyst

PIC North American Headquarters

Genus, plc

100 Bluegrass Commons Blvd., Suite 2200

Hendersonville, TN  37075

Ph:  615-265-2764

Fax:  615-265-2847

lee.higginbotham at pic.com

________________________________

From: redhat-sysadmin-list-bounces at redhat.com [mailto:redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Mahalingam Subramaniam
Sent: Thursday, February 01, 2007 10:01 PM
To: redhat-sysadmin-list at redhat.com
Subject: to recover the swap memory

Dear All

I shall greatly appreciate and honour, if anyone can suggest the solution to the below mentioned issue.

The O/S of the m/c. is RHEL AS 3.0 with kernel 2.4.21-20. with x86_64 and taroon update 3. The RAM is 2GB with swap memory another 2GB. The server is functioning as mail server and this is the only application which is loaded onto the system with a third party vendor's mail application package.

For quite some time the swappable memory itself was found to be consumed rather exhausted to its full quota of 2GB by the application resulting in no free memory for subsequents tasks to execute. As a result of this not only the application but also the system itself becomes frozen/hangs. The system becomes inaccessible even through remote machines using rlogin or putty etc to revive. Being the mail sever it is not desirable to have such frequent interruption in its service.

1. The question is that how to retrieve/restore the swap memory back to its full quota?
2. How to restore the system when it attains hung state without using brute force / hot or cold boot?

Your guidelines and suggestions shall be highly appreciable and valuable.

with kind regards
s.mahalingam

S.Mahalingam
Bioinformatics Centre
Centre for Cellular and Molecular Biology
Habsiguda, Uppal Road, Hyderabad 500 007, India.

Ph:+91-40-27192773, 27192774, 27177814
+91-40-27160222 - 41 (20 Lines)
Ext: 2773, 2774
Fax: :+91-40-27160591, 27160311

E-mail:
smal at ccmb.res.in
smal8 at yahoo.com

http://www.ccmb.res.in
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