SSD Cache drives, the boot pool and auto trim

[M3PH]

In my primary pool I have 8 HDD's in a data vdev and one 250GB NVME ssd as a cache drive. I would like to know, can I enable auto trim on that pool and will it trim the cache drive?

Also, I have 2 cruical mx500's for my boot pool. Is auto trim enabled on the boot pool (some older posts say no but they are older posts refering to older versions)? if not can I enable it and how? I had a quick poke about but couldn't see anything but it's also been a rough night and it's way past my bedtime.

 

[winnielinnie]

autotrim is a per-pool property. The GUI only exposes this option for your data pools.

To outright check this property for all pools:

Code:

zpool get autotrim

To enable it on a pool:

Code:

zpool set autotrim=on mypool

To disable it on a pool:

Code:

zpool set autotrim=off mypool

I'm not sure (nor can I recommend) enabling it for your boot-pool, or even your data pools. You might consider doing weekly trims via a schedule. (This is possible with Core, and should be possible with SCALE.)

Here is a post for reference and how to easily accomplish this:

Auto Trim for NVMe Pool

I currently have a single NVMe Pool (nvme1) for my apps / docker data. Based on my loose knowledge I know that trim feature is good for SSDs / NVMe storage. The SSD is a 512GB Samsung NVMe SSD 950 PRO partitioned as 32 GB boot / 480 GB storage. The 32GB boot pool partition is also mirrored to...

www.truenas.com

I believe if you have a pool comprised of HDDs + SSDs, then a zpool trim command will only be issued to the SSDs in the pool. (In your case, the trim command will only be issued to your L2ARC vdev, ideally.)

 

[M3PH]

thank you very much