Is a HA setup sharing the same physical disks possible?

[Tenou]

Hey there, bear with me - I'm just starting out with HA storage.

I was wondering whether it'd be possible to use two hosts in a ha setup, both connected to the same SAS-disk shelf, sharing the same disks.
Of course, this wouldn't protect against drive failures but would reduce the cost for budget setups immensely, as you could sustain a host failure without needing double the amount of disks to create a mirror. Cause, let's face it, a disk shelf with four separate HBAs and PSUs failing is pretty unlikely, compared to the connected TrueNAS hosts.

Again - this was just a thought that came into my mind, I have no clue if stuff works this way. So please excuse me if I'm talking absolute trash.

 

[morganL]

Hey there, bear with me - I'm just starting out with HA storage.

I was wondering whether it'd be possible to use two hosts in a ha setup, both connected to the same SAS-disk shelf, sharing the same disks.
Of course, this wouldn't protect against drive failures but would reduce the cost for budget setups immensely, as you could sustain a host failure without needing double the amount of disks to create a mirror. Cause, let's face it, a disk shelf with four separate HBAs and PSUs failing is pretty unlikely, compared to the connected TrueNAS hosts.

Again - this was just a thought that came into my mind, I have no clue if stuff works this way. So please excuse me if I'm talking absolute trash.

This what we (iXsystems) do with TrueNAS Enterprise. We package this software as appliances that iXsystems provides. We will offer the same appliance option with TrueNAS SCALE in 2021.