trim is enabled at mount option of filesystem (mount -t ext4 /dev/md0
/home -o discard)
for ext4 it's discard option if i'm not wrong
last kernels have trim support in software raid-1 (md raid1 driver),
just mount the filesystem over it and use, i don't know the exact
kernel version but it's ~1 year old feature

2013/9/13 Derek Piper [off-list ref]:

Hi,

Having found a posting on this list from July this year, I am trying to
find if (and how) TRIM support is supported and enabled under RAID 1 with 2
SSD drives.

The posting was mentioned that it was included in the kernel source as of
October 11th 2012.

I see nothing on the RAID wiki for enabling TRIM for SSD backed arrays. Any
pointers?

I have a system with Debian 7 (Kernel 3.2, mdadm 3.2.5) that I am working
on.

Thanks in advance,

Derek

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Derek Piper - derek.piper@gmail.com
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Roberto Spadim