ZFS migrate a pool from HDD to SSD?

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Hi,
running a zfs pool on SSDs is not new anymore, so my question is: are there any things to take into consideration besides replacing one HDD at a time by a new SSD and let zfs resilver, like we would do to replace a faulty drive?

Will zfs take care of TRIM and other ssd related stuff?

It is a raidz2 pool. It is running 24*7.
 
I have some experience with replacing HDD with SSD and it was successful and unsuccessful. The unsuccessful result - a lot of zfs ro/rw checksums on pool with a huge RW operations. Why? I'm not sure for 100%, but I suppose because of different block size: old HDD had 512, but new SSD had 4k. The only way in this case is to make another pool and use zfs send/receive with snapshots, then again with diff snapshots.
But, if you don't have a huge operation, you can try.
 
skeletor said:
but I suppose because of different block size: old HDD had 512, but new SSD had 4k
Click to expand...

skeletor, sorry to deviate from the main topic of the thread here; does this have to do with disk partitioning? I used to use ssd/nvme with a single GPT partition aligned to 1M given to the zpool before, but recently I started giving the whole disk to zpool, without any partitioning.
 
drr said:
skeletor, sorry to deviate from the main topic of the thread here; does this have to do with disk partitioning? I used to use ssd/nvme with a single GPT partition aligned to 1M given to the zpool before, but recently I started giving the whole disk to zpool, without any partitioning.
Click to expand...
No. It depends on disk model (512 or 4k block size) and it related to ashift ZFS pool.
 
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