Revision as of 14:56, 1 July 2020

Description

Test stopping the swap-on-zram service temporarily.

Setup

A system with swap-on-zram installed and enabled.

How to test

Stop the swap-on-zram service:

sudo systemctl stop swap-create@zram0.service

Confirm it's stopped. The service should be marked as "inactive (dead)":

$ sudo systemctl status swap-create@zram0.service
● swap-create@zram0.service - Create swap on /dev/zram0
     Loaded: loaded (/usr/lib/systemd/system/swap-create@.service; static; vendor preset: disabled)
     Active: inactive (dead) since Sun 2020-06-28 19:32:07 MDT; 3s ago
       Docs: man:zram-generator(8)
             man:zram-generator.conf(5)
    Process: 646 ExecStart=/usr/lib/systemd/system-generators/zram-generator --setup-device zram0 (code=exited, status=0/SUCCESS)
    Process: 1565 ExecStop=/usr/lib/systemd/system-generators/zram-generator --reset-device zram0 (code=exited, status=0/SUCCESS)
   Main PID: 646 (code=exited, status=0/SUCCESS)
        CPU: 25ms

Jun 28 19:24:57 fmac.local systemd[1]: Starting Create swap on /dev/zram0...
Jun 28 19:24:57 fmac.local zram-generator[648]: Setting up swapspace version 1, size = 3.8 GiB (4105170944 bytes)
Jun 28 19:24:57 fmac.local zram-generator[648]: no label, UUID=03831cdf-96df-4a7a-a6c2-3bc8406f33f3
Jun 28 19:24:57 fmac.local systemd[1]: Finished Create swap on /dev/zram0.
Jun 28 19:32:07 fmac.local systemd[1]: Stopping Create swap on /dev/zram0...
Jun 28 19:32:07 fmac.local systemd[1]: swap-create@zram0.service: Succeeded.
Jun 28 19:32:07 fmac.local systemd[1]: Stopped Create swap on /dev/zram0.

zramctl should list no device:

$ zramctl

swapon should only list your disk swap partitions and no /dev/zram0 device:

$ swapon
NAME      TYPE       SIZE USED PRIO
/dev/sda5 partition 10.4G   0B   -2

Start the swap-on-zram service again and confirm it's running:

$ sudo systemctl start swap-create@zram0.service
$ sudo systemctl status swap-create@zram0
● swap-create@zram0.service - Create swap on /dev/zram0
     Loaded: loaded (/usr/lib/systemd/system/swap-create@.service; static; vendor preset: disabled)
     Active: active (exited) since Sun 2020-06-28 19:32:54 MDT; 3s ago
       Docs: man:zram-generator(8)
             man:zram-generator.conf(5)
    Process: 1580 ExecStart=/usr/lib/systemd/system-generators/zram-generator --setup-device zram0 (code=exited, status=0/SUCCESS)
   Main PID: 1580 (code=exited, status=0/SUCCESS)
        CPU: 33ms

Jun 28 19:32:54 fmac.local systemd[1]: Starting Create swap on /dev/zram0...
Jun 28 19:32:54 fmac.local zram-generator[1582]: Setting up swapspace version 1, size = 3.8 GiB (4105170944 bytes)
Jun 28 19:32:54 fmac.local zram-generator[1582]: no label, UUID=f046c6d8-3f69-4f21-81ae-a7b1555891d9
Jun 28 19:32:54 fmac.local systemd[1]: Finished Create swap on /dev/zram0.

Expected Results

Stopping the service should work without issues and it should remove the /dev/zram0 device, i.e. it will no longer be visible in zramctl and swapon commands output.

@@ Line 1: / Line 1: @@
 {{QA/Test_Case
-|description=Test disable swap-on-zram right now!
+|description=Test stopping the swap-on-zram service temporarily.
+|setup=
+# A system with swap-on-zram [[QA:Testcase SwapOnZRAM install and enable|installed and enabled]].
 |actions=
 <ol>
-<li> swap-on-zram should be enabled and running to start this test.
+<li> Stop the swap-on-zram service:
-<li> Turn off swap-on-zram:
+<pre>sudo systemctl stop swap-create@zram0.service</pre>
-<pre>sudo systemctl stop swap-create@zram0</pre>
+<li> Confirm it's stopped. The service should be marked as "`inactive (dead)`":
-<li> Confirm it's stopped:
+<pre>$ sudo systemctl status swap-create@zram0.service
-<pre> sudo systemctl status swap-create@zram0
 ● swap-create@zram0.service - Create swap on /dev/zram0
       Loaded: loaded (/usr/lib/systemd/system/swap-create@.service; static; vendor preset: disabled)
@@ Line 26: / Line 28: @@
 Jun 28 19:32:07 fmac.local systemd[1]: swap-create@zram0.service: Succeeded.
 Jun 28 19:32:07 fmac.local systemd[1]: Stopped Create swap on /dev/zram0.
-[chris@fmac ~]$ zramctl
+</pre>
-[chris@fmac ~]$ swapon
+`zramctl` should list no device:
+<pre>$ zramctl
+</pre>
+`swapon` should only list your disk swap partitions and no `/dev/zram0` device:
+<pre>$ swapon
 NAME      TYPE       SIZE USED PRIO
 /dev/sda5 partition 10.4G   0B   -2
 </pre>
-<li> Optional: Set it back to running, and confirm.
+<li> Start the swap-on-zram service again and confirm it's running:
-<pre> sudo systemctl start swap-create@zram0
+<pre>$ sudo systemctl start swap-create@zram0.service
-[chris@fmac ~]$ sudo systemctl status swap-create@zram0
+$ sudo systemctl status swap-create@zram0
 ● swap-create@zram0.service - Create swap on /dev/zram0
       Loaded: loaded (/usr/lib/systemd/system/swap-create@.service; static; vendor preset: disabled)
@@ Line 47: / Line 53: @@
 Jun 28 19:32:54 fmac.local zram-generator[1582]: no label, UUID=f046c6d8-3f69-4f21-81ae-a7b1555891d9
 Jun 28 19:32:54 fmac.local systemd[1]: Finished Create swap on /dev/zram0.
-$ </pre>
+</pre>
 </ol>
 |results=
-# Status should be inactive (dead).
+# Stopping the service should work without issues and it should remove the `/dev/zram0` device, i.e. it will no longer be visible in `zramctl` and `swapon` commands output.
-# There should be no /dev/zram0 device listed for the `zramctl` and `swapon` commands.
 }}
 [[Category:Test Days Test Cases]]

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QA:Testcase SwapOnZRAM stop: Difference between revisions

Revision as of 14:56, 1 July 2020

Contents

Description

Setup

How to test

Expected Results