ZFS Disk Requirement

[wagabae]

Hi Experts,

I would like to ask from the expert's opinion on create a ZFS pool requirement.
I have 2 2TB SSD disk and plan to create a ZFS with mirror raid.

my question is, my 2 2TB disk is in a raid controller.

is it better to have those 2TB disk is a raid controller and the same time is a mirror during the creation of ZFS?

Please enlightened me.

Thank you so much.

 

[Dunuin]

Recommenden would be to only use enterprise SSDs (U.2/U.3/PCIe card prefered over M.2/SATA/SAS) with built-in power-loss protection on a dumb HBA card or dumb onboard disk controller.

Consumer/Prosumer/NAS SSD and any Raid should be avoided.

See here why not to use HW raid:
https://openzfs.github.io/openzfs-docs/Performance and Tuning/Hardware.html#hardware-raid-controllers

Some HW raid controllers can be switches to HBA mode or flashed to initiator target mode (IT-mode) to completely remove any raid and additional abstraction layer and then using ZFS would be fine with those.
But not all raid controllers allow this.
Some will only present the individual disks as single disk raid0 arrays when switched to HBA mode.