[SOLVED]How to activate swap partition?

[garry_3peace]

Okay , I just realize it when I open KSysGuard. It is written "no swap space available". Then I check with "vmstat" and "free" the result is same (the swap is not used).
I have see the swappiness at /proc/sys/vm/swappiness and the value is 60.
Also I have swap partition at hda6 and hda8 (accidentally create 2 swap partition) . So anybody have idea, what should I do??

[dibl]

Re: How to activate swap partition?

The command to turn it on is

sudo swapon

as per:

http://www.linuxcommand.org/man_pages/swapon8.html

However, the swap partition must be correctly identified in the /etc/fstab file. If so, then it should be activated automatically at boot time.

[Guest]

Re: How to activate swap partition?

You can also set this in Kmenu -> system settings -> advanced [tab] -> disk & filesystems.
Activate Administration Mode and modify/add your swap partitions.

[garry_3peace]

Re: How to activate swap partition?

I have try to use swapon... and the result is this :
I type : sudo swapon -a /dev/hda6

swapon: cannot canonicalize /dev/disk/by-uuid/9cc2b9d5-0b39-4724-82de-01e80ba5e6ed: No such file or directory
swapon: cannot stat /dev/disk/by-uuid/9cc2b9d5-0b39-4724-82de-01e80ba5e6ed: No such file or directory
swapon: cannot canonicalize /dev/disk/by-uuid/dc9dcecf-bde9-487a-ae54-f7c204d6fefe: No such file or directory
swapon: cannot stat /dev/disk/by-uuid/dc9dcecf-bde9-487a-ae54-f7c204d6fefe: No such file or directory

Does anybody know what's going on? could it be my filesystem corrupted or damaged??

[dibl]

Re: How to activate swap partition?

Yep, possibly.

If you can post the output of

fdisk -lu

,

blkid

and

cat /etc/fstab

, maybe we can see the problem.

[garry_3peace]

Re: How to activate swap partition?

Yohooo ...solve!

after see the cat/etc/fstab and compare with /dev/disk/by-uuid, the symbolic links are not same. So, I edit the /etc/fstab with the symbolic name in by-uuid directory. After save the file. Voila! the KSysGuard show the size swap being used.

Here is the the result I look at /dev/disk/by-uuid
lrwxrwxrwx 1 root root 10 2008-04-11 03:51 21d592f8-c644-4605-85a4-781e216cddb0 -> ../../hda6
lrwxrwxrwx 1 root root 10 2008-04-11 03:51 48AC1356AC133E3E -> ../../hda5
lrwxrwxrwx 1 root root 10 2008-04-11 03:51 5245c180-9a8b-4465-a8f8-d92902fc329a -> ../../hda7
lrwxrwxrwx 1 root root 10 2008-04-11 03:51 68FB-5937 -> ../../hda1
lrwxrwxrwx 1 root root 10 2008-04-11 03:51 8748fcad-6e66-4339-b046-14f1395765e3 -> ../../hda8
lrwxrwxrwx 1 root root 10 2008-04-11 03:51 af63a094-ec51-11dc-8244-d1cfae280f6f -> ../../hda9


And this is the fstab before edit by me:
...
# /dev/hda6
UUID=9cc2b9d5-0b39-4724-82de-01e80ba5e6ed none swap sw 0 0
# /dev/hda8
UUID=dc9dcecf-bde9-487a-ae54-f7c204d6fefe none swap sw 0 0
...

But still, I don't how and when did it change.... Still a mystery.

[dibl]

Re: [SOLVED]How to activate swap partition?

Good! I also don't know what would change the symlinks.

[Guest]

Re: [SOLVED]How to activate swap partition?

uuid of the swap partition seems to change if you change it in anyway. For example I got this 'disconnect' between the uuid in /etc/fstab and what /dev/disk/by-uuid reports when I resized my swap partition and formatted it.