FSTrim/Discard Recommended?

[kbocek]

I have a Raspian based distro (FreePBX) and am wondering if running fstrim and mounting the filesystem with discard is recommended? I see the SSD documentation:

https://wiki.debian.org/SSDOptimization

But I am unsure how this applies to Micro-SD cards.

Thanks.

[kbocek]

A bit more research on SSDs. So basically you do *not* mount with discard and instead occasionally run fstrim via the timer:

Code: Select all

/usr/share/doc/util-linux/examples/fstrim.service
/usr/share/doc/util-linux/examples/fstrim.timer

[runboy93]

There is no TRIM for SD cards.

[kbocek]

A posting says the the lsblk -D command tells you if trim is supported:

Code: Select all

$ lsblk -D
NAME        DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
mmcblk0            0        4M     976M         1
|-mmcblk0p2  3145728        4M     976M         1
`-mmcblk0p1  3145728        4M     976M         1

This seems to say it *is* supported.