Swap isn't mounted at start up.

[lved]

Hi there.

My swap partition isn't mounted at start up and I don't have any idea what's the problem.
Maybe someone of you can help me.

Thank you.

eg@eg-ae:~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda6 during installation
UUID=634b4eea-e5dd-4e1d-948b-9536a60d31d5 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda7 during installation
UUID=44cc4e91-4017-438b-a2ae-cb302dcf1957 none swap sw 0 0

UUID=921E99DD1E99BAA5 none ntfs ro,noauto 0 0
UUID=70CCBD45CCBD067E none ntfs ro,noauto 0 0
#/dev/sda none ntfs,ro 0 0
eg@eg-ae:~$ ll /dev/disk/by-uuid/
total 0
drwxr-xr-x 2 root root 140 Dec 7 2012 ./
drwxr-xr-x 6 root root 120 Dec 7 2012 ../
lrwxrwxrwx 1 root root 10 Dec 7 09:22 44cc4e91-4017-438b-a2ae-cb302dcf1957 -> ../../sda7
lrwxrwxrwx 1 root root 10 Dec 7 09:22 634b4eea-e5dd-4e1d-948b-9536a60d31d5 -> ../../sda6
lrwxrwxrwx 1 root root 10 Dec 7 09:22 65CDBE7F6511CD2D -> ../../sda5
lrwxrwxrwx 1 root root 10 Dec 7 09:22 70CCBD45CCBD067E -> ../../sda1
lrwxrwxrwx 1 root root 10 Dec 7 09:22 921E99DD1E99BAA5 -> ../../sda2
eg@eg-ae:~$ sudo fdisk /dev/sda
[sudo] password for eg:

Command (m for help): p

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x10a234e2

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT
/dev/sda2 206848 200206847 100000000 7 HPFS/NTFS/exFAT
/dev/sda3 200208382 976771071 388281345 5 Extended
/dev/sda5 400209920 960765951 280278016 83 Linux
/dev/sda6 200208384 400207871 99999744 83 Linux
/dev/sda7 960768000 976771071 8001536 82 Linux swap / Solaris

Partition table entries are not in disk order

Command (m for help): q

eg@eg-ae:~$ swapon -s
Filename Type Size Used Priority
eg@eg-ae:~$ sudo swapon -a
eg@eg-ae:~$ swapon -s
Filename Type Size Used Priority
/dev/sda7 partition 8001532 0 -1

[CaptainMark]

This is strange, are you sure your swap partition matches the UUID your /etc/fstab file has listed for it, find the UUID with

sudo blkid

and /dev/sda7 should read 44cc4e91-4017-438b-a2ae-cb302dcf1957 if not then change your fstab file to match blkid, if they do match try removing the uuid from fstab and using /dev/sda7 instead

[HermanAB]

BTW, read the swapon man page. Everything you would ever want to know about swap is in there.

[rnerwein]

BTW, read the swapon man page. Everything you would ever want to know about swap is in there.

lved has a problem that as shown can be fixed manualy.
i have a problem (wrote a thread about 2 month ago - no answer). will place my problem here ( may be now any body have an idea)

---------------------- what's going on with /dev/sda5 == first swap device ----------------
1. swapon -s
/dev/sdb5 partition 4466032 0 -1

2. swapon -a
swapon: cannot find the device for UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16

3. cat /proc/swaps
/dev/sdb5 partition 4466032 0 -1

4. grep swap /etc/fstab
UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16 none swap sw 0 0 (sda5)
UUID=4214ad22-10b7-4420-8560-236b7d800467 none swap sw 0 0 (sdb5)
5. blkid
/dev/sda5: UUID="9479039f-f5d7-4a4b-8ff3-5afd28bb3e16" TYPE="swap"
/dev/sdb5: UUID="4214ad22-10b7-4420-8560-236b7d800467" TYPE="swap"

6. fdisk -l
/dev/sda5 940862853 945071819 2104483+ 82 Linux Swap / Solaris
/dev/sdb5 84003948 92936024 4466038+ 82 Linux Swap / Solaris

7. swapon: -f -v 9479039f-f5d7-4a4b-8ff3-5afd28bb3e16: „stat“ gescheitert.: Datei oder
Verzeichnis nicht gefunden (file or directory not found)

8. ls -l /dev/sda5
brw-rw---- 1 root disk 8, 5 Dez 7 11:29 /dev/sda5

9. grep sda5 /var/log/kern.log
Dec 7 07:31:17 tschang kernel: [ 1.315760] sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 sda8 >

10. my brain fried - core dumped

any idea - help

[HermanAB]

2. swapon -a
swapon: cannot find the device for UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16

Well, there is your error.

Either fix the UUID or don't use UUIDs, but rather the device names such as /dev/sdb or whatever.

[lved]

4. grep swap /etc/fstab
UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16 none swap sw 0 0 (sda5)
UUID=4214ad22-10b7-4420-8560-236b7d800467 none swap sw 0 0 (sdb5)
5. blkid
/dev/sda5: UUID="9479039f-f5d7-4a4b-8ff3-5afd28bb3e16" TYPE="swap"
/dev/sdb5: UUID="4214ad22-10b7-4420-8560-236b7d800467" TYPE="swap"

The UUID from the fstab is different to the UUID from blkid.


Back to my case:
Are blkid and ll /dev/disk/by-uuid/ using different resources?
Whatever - UUID is correct.

tried it with /dev/sda7 in the fstab - no change at all.
swapon -a stillworking.

eg@eg-ae:~$ sudo blkid
[sudo] password for eg:
/dev/sda1: LABEL="SYSTEM" UUID="70CCBD45CCBD067E" TYPE="ntfs"
/dev/sda2: LABEL="OS" UUID="921E99DD1E99BAA5" TYPE="ntfs"
/dev/sda5: LABEL="STORAGE" UUID="65CDBE7F6511CD2D" TYPE="ntfs"
/dev/sda6: UUID="634b4eea-e5dd-4e1d-948b-9536a60d31d5" TYPE="ext4"
/dev/sda7: UUID="44cc4e91-4017-438b-a2ae-cb302dcf1957" TYPE="swap"
eg@eg-ae:~$ sudo vim /etc/fstab
eg@eg-ae:~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda6 during installation
UUID=634b4eea-e5dd-4e1d-948b-9536a60d31d5 / ext4 errors=remount-ro 0 1
# swap was on /dev/sda7 during installation
#UUID=44cc4e91-4017-438b-a2ae-cb302dcf1957 none swap sw 0 0
/dev/sda7 none swap sw 0 0
UUID=921E99DD1E99BAA5 none ntfs ro,noauto 0 0
UUID=70CCBD45CCBD067E none ntfs ro,noauto 0 0
#/dev/sda none ntfs,ro 0 0

[rnerwein]

2. swapon -a
swapon: cannot find the device for UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16

Well, there is your error.

Either fix the UUID or don't use UUIDs, but rather the device names such as /dev/sdb or whatever.

1. UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16
2. swapon: cannot find the device for
UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16

sorry where is my error ?

1. and 2. are always identical. in fstab, swapon -a, blkid and fisk -l.
even /dev/sda5 is always the same (/dev/sdb5 is the second disk there is no problem with the swap device i have the problem with the swap on /dev/sda5)
and now ????

[oldfred]

I have never seen none used for anything other than swap.
in fstab that none would specify that the partition has none fs type.

UUID=921E99DD1E99BAA5 none ntfs ro,noauto 0 0
UUID=70CCBD45CCBD067E none ntfs ro,noauto 0 0

Generally you still need to create a mount point even if you do not want to mount it with noauto.

Some examples I copied from somewhere, but you have to create the mounts:

Hide mount
UUID=200C11850C1156DE /mnt/SysRes ntfs defaults,noauto 0 0
Hide windows mount with noauto: 777 is no permissions at all
/dev/sda2 /Windows/sda2 ntfs defaults,noauto,umask=777 0 0

Edit - I did find that Macs use none as a entry, but have not found it in fstab. It may also be used with bind, but I do not know bind.

[lved]

1. UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16
2. swapon: cannot find the device for
UUID=9479038f-f5d7-4a4b-8ff3-5afd28bb3e16

sorry where is my error ?

1. and 2. are always identical. in fstab, swapon -a, blkid and fisk -l.
even /dev/sda5 is always the same (/dev/sdb5 is the second disk there is no problem with the swap device i have the problem with the swap on /dev/sda5)
and now ????

@rnerwein Have you read my post too?
Your UUID is wrong, check it with sudo blkid - I marked the difference between this two UUIDs out earlier.

@oldfred It's not a problem with the ntfs. I don't want them to be mounted by Ubuntu by default.

[rnerwein]

The UUID from the fstab is different to the UUID from blkid.


Back to my case:
Are blkid and ll /dev/disk/by-uuid/ using different resources?
Whatever - UUID is correct.

tried it with /dev/sda7 in the fstab - no change at all.
swapon -a stillworking.

oh my god
lved got eyes like a lynx ( that's what we say in german - means althogh eyes like an eagle)
takes me hours and i can't find the differents of the blkid's
fstab -> UUID="9479038f-f5d7-4a4b-8ff3-5afd28bb3e16" TYPE="swap"
blkid -> UUID="9479039f-f5d7-4a4b-8ff3-5afd28bb3e16" TYPE="swap"
-------------------------------- |

where does this come from - dosen't matter the problem is fixed
thank's much lved