Dear Ted, dear Darrick,
On Debian Sid/unstable, I noticed the new service `scrub/e2scrub_reap.service`
installed in the default target [1][2].
> E2fsprogs now has an e2scrub script which will allow e2fsck to be run on
> volumes that are mounted on an LVM device. The e2scrub_all will find
> all ext* file systems and run them using e2scrub (if possible).
```
$ nl -ba scrub/e2scrub_reap.service.in
1 [Unit]
2 Description=Remove Stale Online ext4 Metadata Check Snapshots
3 Documentation=man:e2scrub_all(8)
4
5 [Service]
6 Type=oneshot
7 WorkingDirectory=/
8 PrivateNetwork=true
9 ProtectSystem=true
10 ProtectHome=read-only
11 PrivateTmp=yes
12 AmbientCapabilities=CAP_SYS_ADMIN CAP_SYS_RAWIO
13 NoNewPrivileges=yes
14 User=root
15 IOSchedulingClass=idle
16 CPUSchedulingPolicy=idle
17 ExecStart=@root_sbindir@/e2scrub_all -A -r
18 SyslogIdentifier=%N
19 RemainAfterExit=no
20
21 [Install]
22 WantedBy=default.target
```
As this is installed in the default target, it increases the boot time of
my target system, which does not have any LVM volumes. Especially, as a
shell script is started, and on my system resources are scarce during
boot-up.
```
$ systemctl status -o short-precise e2scrub_reap.service
● e2scrub_reap.service - Remove Stale Online ext4 Metadata Check Snapshots
Loaded: loaded (/lib/systemd/system/e2scrub_reap.service; enabled; vendor preset: enabled)
Active: inactive (dead) since Mon 2019-03-18 12:17:13 CET; 1min 1s ago
Docs: man:e2scrub_all(8)
Process: 447 ExecStart=/sbin/e2scrub_all -A -r (code=exited, status=0/SUCCESS)
Main PID: 447 (code=exited, status=0/SUCCESS)
Mar 18 12:17:08.223560 plumpsklo systemd[1]: Starting Remove Stale Online ext4 Metadata Check Snapshots...
Mar 18 12:17:13.996465 plumpsklo systemd[1]: e2scrub_reap.service: Succeeded.
Mar 18 12:17:13.996808 plumpsklo systemd[1]: Started Remove Stale Online ext4 Metadata Check Snapshots.
```
Reading the manual, the switch `-r` “removes e2scrub snapshots but do not
check anything”.
Does this have to be done during boot-up, or could it be done after the
default target was reached, or even during shutting down?
Kind regards,
Paul
[1]: https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/tree/scrub
[2]: https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/tree/doc/RelNotes/v1.45.0.txt
Attachment:
smime.p7s
Description: S/MIME Cryptographic Signature
