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ssd.md: Implemented fstrim in a more general manner. Added instructions. #577

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ssd.md: Implemented fstrim in a more general manner. Added instructions. #577

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21 changes: 16 additions & 5 deletions src/config/ssd.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,15 +13,18 @@ solid state drive partition does not show TRIM support, please verify that you
chose a file system with TRIM support (ext4, Btrfs, F2FS, etc.). Note that F2FS
requires kernel 4.19 or above to support TRIM.

To run TRIM one-shot, you can run
[`fstrim(8)`](https://man.voidlinux.org/fstrim.8) manually. For example, if your
/ directory is on an SSD:
To run TRIM once, you can run [fstrim(8)](https://man.voidlinux.org/fstrim.8)
manually. For example, to trim all mounted filesystems mentioned in `/etc/fstab`
on devices that support the discard operation:

```
# fstrim /
# fstrim --fstab
```

To automate running TRIM, use cron or add the `discard` option to `/etc/fstab`.
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You should mention the new method in this list: "To automate running TRIM, use cron, run fstrim at boot or shutdown time, or add the discard option to /etc/fstab.

Note: using `discard` is not recommended. The `discard` method might cause the
system to slow down because it forces the system to apply TRIM instantly on
every individual file deletion.
Comment on lines 24 to +27
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I think this downside should be mentioned in the fstab section. Maybe use "add the appropriate mount option to /etc/fstab" above so people don't just use the option and move on without reading everything.


## Periodic TRIM with cron

Expand All @@ -30,7 +33,7 @@ Add the following lines to `/etc/cron.daily/fstrim`:
```
#!/bin/sh

fstrim /
fstrim --fstab
```

Finally, make the script executable:
Expand All @@ -39,6 +42,14 @@ Finally, make the script executable:
# chmod u+x /etc/cron.daily/fstrim
```

## TRIM on system start or system shutdown

Append the following line to `/etc/rc.local` or `/etc/rc.shutdown`:

```
fstrim --fstab
```

## Continuous TRIM with fstab discard

You can use either continuous or periodic TRIM, but usage of continuous TRIM is
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