Proxmox OS on single SSD

[elkondor]

i need ti upgrade some old PVE install (some homelab that run H24), on occasion I would like to upgrade hw.
now i have serverraid 5014 controller raid1 for system , raid1 for vm.
i backup VM and config system file on a NAS.

I think to put proxmox OS on single SSD (good consumer ssd) and to maintain raid for VM.
ssd contain template iso or other.

but OS need more write on ssd? I don't want to destroy primary disk...
hazard?

tnks.

 

[t.lamprecht]

but OS need more write on ssd? I don't want to destroy primary disk...
hazard?

SSDs are pretty write durable, we have some >5 year old consumer SSDs here still running smoothly (albeit the wearout is at 205 now).
But naturally having a single disk, consumer or not, is always a single point of failure. But as long as you backup the VM configs, or at best the whole /etc/pve and have backups of the VMs, you can be up and running pretty fast again if that OS disk failed but the RAID is still good. As you could reinstall PVE, restore the relevant configs and start the guests again.

So, possible problematic? yes, but as long as you have some (tested!) backup strategy on another offsite storage you'll be fine.

 

[elkondor]

yes, but it seemed absurd to use two SSDs under raid 1 controller since hypothetically the writing life is similar ....
if the former dies, the latter may also give up shortly

 

[t.lamprecht]

Ah, that's the question...
Now, that's why one should not use SSDs from the same production batch in a RAID, as those have often very similar lifetimes.
If you have a spare disk you can start to re-silver immediately and so get out of the "danger zone" faster.

But yes, more redundancy is better, be it through something like a RAID-Z2 where theoretically two disks can fail or through offsite backups - which allow all to fail and still not being completely lost