I've read that SSD TRIM is now supported in the recent kernels with ext4 too (see How to enable TRIM? ).
Is it OK/safe to enable TRIM when having a) LVM b) RAID1+LVM?
Device Mapper based RAID
This might have changed, but a quick grep of the oneiric kernel
Speaking from experience, I am not a big fan of using DM for managing RAID sets, the tools are kinda cumbersome and basic admin tasks are a burden; and so is recovering a failed RAID. If you want to take the plunge I strongly recommend you model the setup in a VM so you can become accustomed with the toolset's ins and outs. BTW, don't get confused by