topic Re: Swap partition is not mounted automatically. in Operating System - Linux

Swap partition is not mounted automatically.

Minoru Asano — Tue, 10 Jul 2007 03:55:13 GMT

Hello,

At the customer site, swap partition is not mounted automatically.

[ENVIRONMENT]
RHEL ES 4 up2
HP Proliant BL25p 4G memory

[SITUATION]
One application has consumed physical memory.
The system has 2G swap memory, and when the application has gone down, swap space
seems be "0" by viewing free command.
The application is data transfer application by ftp command.

After reboot, the swap space is not mounted.
The swap partition is configured at /etc/fstab.
Nothing message appeared by viewing "swapon -s" command.
And the situation is not changed even if he executed "mount -a" command.
But he execute "swapon -a" command, the mount partition was mounted.

[QUESTION]
- Have you ever seen this phenomenon ?
- Why is not the swap partition mounted automatically ?

[ADDITIONAL INFORMATION]
When he executed "swapon -s" command, the following messages has appeared at messages file:
Jul 5 19:03:32 host123 kernel: Adding 2097112k swap on /dev/cciss/c0d0p2. Priority:-1 extents:1
But there is not information like following:
Jun 27 13:14:36 ssc0001 rc.sysinit: Enabling swap space: succeeded

Thank you for advice.
Best Regards.
/Minoru

Re: Swap partition is not mounted automatically.

Steven E. Protter — Tue, 10 Jul 2007 06:27:56 GMT

Shalom,

check /var/log/messages

There may be some deep ugly problem revealed elsewhere in that file.

Check for invisible characters in /etc/fstab or a mistake as compared the partition you ran the swapon command against.

Also fdisk -l

Make sure the partition is swap or LVM depedning on how you did the system.

SEP

Re: Swap partition is not mounted automatically.

Heironimus — Tue, 10 Jul 2007 10:17:30 GMT

"mount -a" will never activate swap because swap is not a filesystem to be mounted. swapon is the proper command to use.

The reason it fails to activate the swap is probably displayed to the console or written to a log while the machine boots. It may show up in /var/log/dmesg.

Re: Swap partition is not mounted automatically.

skt_skt — Tue, 10 Jul 2007 20:10:11 GMT

Check the /var/log/boot.log. there will be an entry for sucess or failure.

Re: Swap partition is not mounted automatically.

Vitaly Karasik_1 — Wed, 11 Jul 2007 01:37:46 GMT

May be it was some problem with a disk where swap partition is located?

(I hope you didn't delete swapon command from /etc/rc.sysinit script!)