[SOLVED] Samsung SM883/PM883 SATA SSDs for ZFS RAID1?

[r0PVEMox]

So far I've read the Samsung SM883 would be great in general. Would that be so? There are also PM883s and cost 50% compared to the SM883. Are they both do their job, without queuing a regular (VM) Windows 10 update for example? I've been using 2 PNY CS900 and they hit the limit pretty fast. Makes them kind useless for my usage.

 

[_gabriel]

using zfs on ssd with TLC or QLC (like pny cs900) will quickly slow down.
on these ssd, to get perf & regular "wear" prefer lvmthin + daily backup on second ssd
or, if you need mirror, lvm can do but manual Setup + vdisk as qcow2

for zfs, iirc : it need synchronous writes to ensure integrity. so write performance will be poor if you haven't power protection inside the ssd like entreprise grade like SM883/PM883.
You can pveperf to get your fsync.
iirc, you can use writecache more safety too with entreprise grades.

 

[mvs]

using zfs on ssd with TLC (like PM883) or QLC (like pny cs900) will quickly slow down.

PM883 is an enterprise grade SSD with PLP and sufficient high fsync rate (~ 6000 fsyncs/s).

 

[_gabriel]

thanks for correction, i've edited.
high fsync and endurance are thanks to its PLP + over provisionning

 

[r0PVEMox]

Thanks for your help. The PM883 might be a decent solution. Moving from ashift=12 to ashift=9, improved the speed a lot on the PNYs, but the IO is terrible. Until upgrading to better disks, I'll try to optimize the set a bit more.