[SOLVED] Swap Partition keeps being automounted, but it shouldn't.

Hi,
I created a swap partition as part of setting up a Linux From Scratch installation, and it was intended for that system only. However it is automounted every time I boot my arch.
It is neither mentioned in my fstab or my mtab. I tried # swapoff , and that disables it for that instance, but after boot it's mounted again. Tried giving it an fstab entry with the noauto option.
Last edited by krork (2015-01-05 18:11:24)

Thanks Guys!
I have not yet found a way to stop systemd from automounting the swap partition. I'm a bit busy this January. However, as a workaround I created a swapoff.service file in /etc/systemd/system with this content:
[Unit]
Description=Turns off Swap Partition
DefaultDependencies=no
After=getty.target
[Service]
ExecStart=/usr/bin/swapoff /dev/sdaX
[Install]
WantedBy=multi-user.target
Replace the /dev/sdaX with your according partition, of course.
Edit: Also you'll want to enable it: # systemctl enable swapoff.service
So in case anyone else is having this problem and just wants a dirty fix, this worked for me, for now. If I find out how to keep systemd from automounting in the first place I'll let you know.
Last edited by krork (2015-01-05 16:50:33)

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[SOLVED] I don't think my swap partition is being mounted?

My top command never indicates any of the swap being used, could it be because I don't use over a gig of ram?
Swap: 2048280k total, 0k used, 2048280k free, 380392k cached
and when I booted my machine I once saw it saying swap mount - Failed
not entirely sure now as it doesn't mention it.
Here is my fstab
tmpfs /tmp tmpfs nodev,nosuid 0 0
UUID=01f2ea1e-7166-4081-949b-9df766c80ae9 / ext4 defaults 0 1
UUID=81478b57-9b58-4d2f-a814-30461720b6e0 /home ext4 defaults 0 1
UUID=84e46ff4-dd90-483d-a4a3-dda3b48c17de /boot ext2 defaults 0 1
#UUID=bf2f66e9-fcdc-4698-82b1-05249f2ee999 swap swap defaults 0 0
/dev/sda2 swap swap defaults 0 0
UUID=86C05EF4C05EEA47 /home/dalesalter/Desktop/Storage ntfs-3g gid=users,fmask=113,dmask=002 0 0
UUID=303361C774412966 /home/dalesalter/Desktop/Windows ntfs-3g gid=users,fmask=113,dmask=002 0 0
and my fdisk
Device Boot Start End Blocks Id System
/dev/sda1 * 63 208844 104391 83 Linux
/dev/sda2 208845 4305419 2048287+ 82 Linux swap / Solaris
/dev/sda3 4305420 65754044 30724312+ 83 Linux
/dev/sda4 65754045 488392064 211319010 83 Linux
Thanks in advance!
Last edited by Compulsed (2011-10-05 14:15:52)

What does free say?
ewaller@odin:~ 1001 %free
total used free shared buffers cached
Mem: 3961932 2518136 1443796 0 290204 1197880
-/+ buffers/cache: 1030052 2931880
Swap: 4000148 104 4000044
ewaller@odin:~ 1002 %

[SOLVED]Partitions not getting automounted at boot

Hi,
After I while I wasn't using my laptop I've made a full update (ofc I've checked for announcement for any manual intervention needed but there was nothing new). On reboot slim failed to autologin so I've switched to console to check the .Xinitrc file but, as soon as I logged in, the terminal output said it couldn't get to the user home directory because it's not there , and in fact the /home directory is actually empty. Since I didn't deleted anything of course I guess my home is probably not getting automounted or something...can this be the problem? how can I solve this ?
Thanks in advance
Last edited by Eit (2013-10-21 14:54:26)

I've found in the boot log the message exactly reported in this thread.
https://bbs.archlinux.org/viewtopic.php?id=170898
And I've seen the guy fixed the error message warning about the root device not being rw, message which I've never sorted out becuase I wasn't getting any real problem out of that. I've read further in the topic and I've found the link to another topic related to the RW root partition problem
https://bbs.archlinux.org/viewtopic.php?id=167153&p=4
However, modifying the default grub config and regenerating that (as in post #95, even if post #96 says it shouldn't be necessary anymore) does not fix the problem of the root partition not being mounted as read write and neither the problem of partitions not getting automounted.
I'm getting a bit confused.
Edit: changing topic title to clarify
Last edited by Eit (2013-10-17 21:12:01)

SWAP partition (Hibernate Failure)[SOLVED]

Hi Folks,
My suspend to disk (Hibernate) is not working. When I boot up my pc, it starts processing. In meanwhile, I can see the output on my screen. At some point, it starts checking mounted filesystems
"Checking Filesystems"
/dev/sda1
dev/sda3
/dev/sda4
I do not know why this skips /dev/sda2 which is my swap partition actually.
After three or four lines, I can see from the output saying "Activating Swap". Does it mean that my swap partition is configured correctly or not?
There is one more thing. I use gnome. In gnome, when I open System Monitor (from the panel) > and under File Systems, I also can not see my swap partition which is /dev/sda2 while I can see all other partitions which are /, /boot, /home.
Does it mean that the partition can not be mounted correctly.
I really appreciate any kind of help.
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Last edited by Archie_Enthusiasm (2010-11-28 15:49:30)

Here is the output:
cat /proc/swaps
Filename Type Size Used Priority
/dev/sda2 partition 6297476 0 -1
free -m
total used free shared buffers cached
Mem: 3013 1182 1830 0 58 532
-/+ buffers/cache: 591 2421
Swap: 6149 0 6149
It says that the swap is being used. But when I hibernate my pc, it correctly shuts itself down. But when I wake up the pc again, it says at the boot time that my / , /root, /boot mount file systems were not unmounted correctly and starts checking the filesystems (Some kind of journaling process starts). When it boots up, the stored session is no more there or existent anymore. It is like as I forced the system to shutdown and start it again (Just like as there were a system freeze and then I did shutdown the system by pressing the power button for more than 10 secs and then restarted). So I suspect that the system did not shutdown correctly even if there were no strange occurrence happening when I did the hibernate.
I hope someone can help me. If you need some more information about the configuration on my pc, please tell me command and I will post the output.
Thanks in advance
Last edited by Archie_Enthusiasm (2010-10-28 21:41:58)

[Solved] Do I need a swap partition /swap file?

Hello Arch Community.
I want to install Arch Linux on my Aspire V5-573G Notebook with 8GB RAM and a 120GB 840 Evo SSD from Samsung. So my question is, do I actually need a swap partition / swap file? I read the arch-wiki pages about swap and suspend-to-disk / suspend-to-ram, and the only thing thats obviously profiting from / needing a swap partition is suspend-to-disk, no other things are mentioned in this regard. Is a swap partition in any other way important?
Thanks in advance.
Last edited by Oedner (2013-12-21 12:41:19)

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Just trying to play devil's advocate here. I'm not happy with the OOM killer either and I'd rather have a deterministic solution to out-of-memory situations, but I realize that it's probably not an easy problem to solve.

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[SOLVED] Virtual Memory Exhausted with unused 16g Swap Partition.

Hello all, long time reader, first time poster. So basically what I'm running into is that I'm having Virtual Memory Exhausted errors with various programs even though I have a 16g swap partition mounted. I've manually enabled it to try it as well. Here's some outputs to give you an idea of how my system is set up. It's a UEFI fresh install, only a couple days old.
fstab:
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
tmpfs /tmp tmpfs nodev,nosuid 0 0
# /dev/sdb3
UUID=ea7a0311-6314-4215-b98d-7360552b28c4 / ext4 rw,relatime,data=ordered 0 1
# /dev/sdc3
UUID=8f6f2006-3a9c-4563-a149-547d758e2af1 /home ext4 rw,relatime,data=ordered 0 2
# /dev/sdb2
UUID=baf1ba80-ddf3-4cbb-a13e-b81a0af0a9e7 /boot ext4 rw,relatime,data=ordered 0 2
# /dev/sdb1
UUID=2B46-5340 /boot/efi vfat rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 2
# /dev/sdc1
UUID=4336d783-c289-4fbf-8c59-f1a1da782130 /var ext4 rw,relatime,data=ordered 0 2
# /dev/sdc2
UUID=96a60f08-a57f-42f1-80ff-846d02a29199 /var/log ext4 rw,relatime,data=ordered 0 2
# /dev/sda2
UUID=c5d5879a-b0e8-4976-8057-2f95975a1251 /share ext4 rw,relatime,data=ordered 0 2
# /dev/sdb4
UUID=6e6277c4-a69a-4838-83cd-c206959acf0e /store ext4 rw,relatime,data=ordered 0 2
#swap
UUID=21a56b10-85e5-48a1-91e5-995eae0dfba4 none swap defaults 0 0
lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 16G 0 part [SWAP]
└─sda2 8:2 0 915.5G 0 part /share
sdb 8:16 0 931.5G 0 disk
├─sdb1 8:17 0 1G 0 part /boot/efi
├─sdb2 8:18 0 1G 0 part /boot
├─sdb3 8:19 0 50G 0 part /
└─sdb4 8:20 0 879.5G 0 part /store
sdc 8:32 0 931.5G 0 disk
├─sdc1 8:33 0 20G 0 part /var
├─sdc2 8:34 0 2G 0 part /var/log
└─sdc3 8:35 0 909.5G 0 part /home
sr0 11:0 1 1024M 0 rom
cat /proc/meminfo
MemTotal: 12256600 kB
MemFree: 9926584 kB
Buffers: 212588 kB
Cached: 774636 kB
SwapCached: 0 kB
Active: 1179860 kB
Inactive: 638584 kB
Active(anon): 831604 kB
Inactive(anon): 14480 kB
Active(file): 348256 kB
Inactive(file): 624104 kB
Unevictable: 4 kB
Mlocked: 4 kB
SwapTotal: 16777212 kB
SwapFree: 16777212 kB
Dirty: 32 kB
Writeback: 0 kB
AnonPages: 831320 kB
Mapped: 196008 kB
Shmem: 14892 kB
Slab: 345008 kB
SReclaimable: 316620 kB
SUnreclaim: 28388 kB
KernelStack: 2616 kB
PageTables: 27032 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 22905512 kB
Committed_AS: 3365808 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 357936 kB
VmallocChunk: 34359373819 kB
HardwareCorrupted: 0 kB
AnonHugePages: 86016 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 117756 kB
DirectMap2M: 4059136 kB
DirectMap1G: 8388608 kB
swapon -s
Filename Type Size Used Priority
/dev/sda1 partition 16777212 0 -1
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 20
file size (blocks, -f) unlimited
pending signals (-i) 94832
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 94832
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
I did just notice that it's showing 4gb less RAM than there should be (12 instead of 16, I'll be checking into that about the same time I hit submit) but as far as I can tell the system shouldn't even be worried about swap 99.99% of the time. Any ideas?
Edit: On reboot system show the full 16gb of RAM.
Last edited by inquisitorthreefive (2012-11-19 07:44:32)

inquisitorthreefive wrote:
I did just notice that it's showing 4gb less RAM than there should be (12 instead of 16, I'll be checking into that about the same time I hit submit) but as far as I can tell the system shouldn't even be worried about swap 99.99% of the time. Any ideas?
Edit: On reboot system show the full 16gb of RAM.
Could it be a hardware problem with RAM? Is there a 4 GB RAM chip in the machine that may have failed?

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[SOLVED] Please verify: swap partition needed for dm-crypt/LUKS??

Hi,
Can anyone confirm whether or not the following is accurate (from http://wiki.archlinux.org/index.php/Sys … artitions)
There are 3 required partitions for any encrypted system:
- The root file system: /
- The initial boot partition: /boot
- The swap partition: swap
Do I need a swap partition if I encrypt? I can't seem to find reference to swap being mandatory anywhere else.
Last edited by jwhendy (2010-10-12 13:27:12)

You don't need swap. The minimal required setup is having two partitions: boot and root, where /boot must not be encrypted and / can be encrypted.
Last edited by stfn (2010-10-12 12:45:22)

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[Solved]Can I install arch without a swap partition ?

I only have one primary partition free to install arch, with 3 primary partition and 1 extend partition, I have no other choice except install without swap partition.
Is there any suggestion? I will try it until I get a U storage to write .img in.
Last edited by sailor (2009-03-17 00:47:31)

Sure, it's perfectly possible to use any linux system without swap. including arch.
There are 2 ways to do disk partitioning in /arch/setup:
1) autoprepare. with this method, you pick a disk (a disk you want to use entirely). you will be asked some questions (including how big swap should be). this method will create the partitions with the sizes you mention (/boot, swap, / and /home) optionally you can add additional fs'es
2) manual. the installer can launch cfdisk for you if you need to alter partitions (if you want this), and after that you can define pretty much your stuff the way you like it (eg no swap) iirc. i'm not 100% sure though.
Frankly I don't understand why you say "I have no choice", if you don't have enough partitions, you can always create additional ones.

[SOLVED] Swap Partition keeps being automounted, but it shouldn't.

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