[solved] Is my swap even enabled?

PACMANchasingme · 01-14-2016, 10:00 AM

How come all 3 /dev/sda are commented out and the file systems still work and my swap does not show up in mount? I am confused.

Code:

robby ~ $ cat /etc/fstab;mount | grep /dev/sda
# 
# /etc/fstab: static file system information
#
# <file system>	<dir>	<type>	<options>	<dump>	<pass>
# /dev/sda3
UUID=19627cc7-e5db-4dc9-a8d7-3c6a2b1d40b6	/         	ext4      	rw,relatime,data=ordered	0 1

# /dev/sda1
UUID=c93cdbf7-0f20-4eee-b1d4-77458be46b86	/boot     	ext4      	rw,relatime,data=ordered	0 2

# /dev/sda2
UUID=bc5936d6-4949-4156-a935-582155fc401a	none      	swap      	defaults  	0 0

# smb
/dev/sda3 on / type ext4 (rw,relatime,data=ordered)
/dev/sda1 on /boot type ext4 (rw,relatime,data=ordered)
robby ~ $

suicidaleggroll · 01-14-2016, 10:15 AM

They're commented out because they're comments. The actual mount uses UUID to protect against drive device names changing (eg, if you boot with a USB drive plugged in, it may take over sda while your boot drive moves to sdb, using UUID for the mount means that doesn't cause any problems).

"mount" doesn't show swap since it's not mounted in the filesystem, same with df. Use free if you want to see your available swap space.

TxLonghorn · 01-14-2016, 10:16 AM

The 2 lines:
# /dev/sda1
# /dev/sda2
are commented out because they are comments - only there to let you know what the next line is for.

As for the swap not working, post the result of

Code:

sudo mount -a

and

Code:

sudo lsblk -o NAME,FSTYPE,UUID

EDIT: I see suicidaleggroll posted while I was writing...

michaelk · 01-14-2016, 10:21 AM

In addition look at the output of the command blkid. It will display device ID, UUID and file system which might help you tie everything together. Which does the same thing as the lsblk command as posted.

PACMANchasingme · 01-14-2016, 10:21 AM

With lsblk I see that swap is active.

Assumed that mount should list it without a second thought. thanks

Shadow_7 · 01-14-2016, 10:23 AM

# swapon -s

$ free

should list swap stuff as it does NOT show up in mount.