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add systemd fstrim and efi initrd rebuild step

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from https://mail-archive.com/qubes-users@googlegroups.com/msg19082.html and followups
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awokd 2018-02-16 16:47:36 +00:00 committed by GitHub
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configuration/disk-trim.md
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@ -32,6 +32,18 @@ Configuration
----------
In all versions of Qubes, you may want to set up a periodic job in `dom0` to trim the disk.
This can be done with either systemd (weekly only) or cron (daily or weekly).
* **Systemd**
From a terminal as a regular user:
```
systemctl enable fstrim.timer
systemctl start fstrim.timer
```
* **Cron**
This can be done from a terminal as root, by creating a `trim` file in `/etc/cron.daily` (or `/etc/cron.weekly`).
Add the following contents:
@ -40,7 +52,6 @@ Add the following contents:
#!/bin/bash
/sbin/fstrim --all
```
And mark it as executable with `chmod 755 /etc/cron.daily/trim`.
**Note** Although discards can be issued on every delete inside `dom0` by adding the `discard` mount option to `/etc/fstab`, this option can hurt performance so the above procedure is recommended instead.
@ -73,17 +84,13 @@ To enable TRIM support in dom0 with LUKS you need to:
3. Add `rd.luks.options=discard` to kernel cmdline (follow either GRUB2 or EFI, not both):
* GRUB2: `/etc/default/grub`, `GRUB_CMDLINE_LINUX` line and
Rebuild grub config (`grub2-mkconfig -o /boot/grub2/grub.cfg`)
* EFI: `/boot/efi/EFI/qubes/xen.cfg`, `kernel=` line(s)
Rebuild grub config (`grub2-mkconfig -o /boot/grub2/grub.cfg`), then
Rebuild initrd **in hostonly mode** (`dracut -H -f`)
* EFI: `/boot/efi/EFI/qubes/xen.cfg`, `kernel=` line(s), then
Rebuild initrd (`dracut -f /boot/efi/EFI/qubes/initramfs-$(uname -r).img $(uname -r)`)
4. Rebuild initrd **in hostonly mode**:
4. Reboot the system.
~~~
dracut -H -f
~~~
5. Reboot the system.
6. To verify if discards are enabled you may use `dmsetup table` (confirm the line for your device mentions "discards") or just run `fstrim -av` (you should see a `/` followed by the number of bytes trimmed).
5. To verify if discards are enabled you may use `dmsetup table` (confirm the line for your device mentions "discards") or just run `fstrim -av` (you should see a `/` followed by the number of bytes trimmed).