On 6/11/21 6:01 AM, Reco wrote:
On Fri, Jun 11, 2021 at 05:55:02AM -0700, David Christensen wrote:On 6/10/21 11:49 PM, Reco wrote:On Thu, Jun 10, 2021 at 11:43:12PM -0700, David Christensen wrote:I don't bother with the 'discard' option in /etc/fstab, but perhaps I should. The fstab(5) and mount(8) manual pages are unclear if 'discard' applies to swap or ext4.swapon(8): -d, --discard[=policy] Enable swap discards ... The /etc/fstab mount options discard, discard=once, or discard=pages may also be used to enable discard flags. Therefore 'discard' can be applied to both ext4 and swap.Thank you for the clarification regarding trim and swap. Where do you see the information for ext4?You just have to know where to look - ext4(5): discard/nodiscard Controls whether ext4 should issue discard/TRIM commands to the underlying block device when blocks are freed. This is useful for SSD devices and sparse/thinly-provisioned LUNs, but it is off by default until sufficient testing has been done. How exactly this ended in manpages section 5 (which is "File formats and conventions eg /etc/passwd") is anyone's guess. Reco
Thank you.
I needed to RTFM MOUNT(8) more carefully:
FILESYSTEM-SPECIFIC MOUNT OPTIONS
You should consult the respective man page for the filesystem
first.
If you want to know what options the ext4 filesystem
supports, then
check the ext4(5) man page.
David