M.2 SATA SSD for Proxmox OS. ZFS or raid1 ?

[opt-jgervais]

Hi,

I would to setup Proxmox OS within a double M.2 SATA SSD with 240G of capacity each.
https://www.dell.com/support/manual...235601-90f8-4e0f-aa08-03c1c74c8ec0&lang=en-us
Supported M.2 drives are Intel M.2 S4510, Micron M.2 5100 and Micron M.2 5300.

Raid1 should be better to spare SSD Life or ZFS mirror is OK ? What's your advice ?

It will be a proxmox cluster of 3 or more nodes with Ceph used for VM.

Jé.

 

[binaryanomaly]

As I understand it, if you want to use ZFS as the underlying filesystem the general recommendation is to not use a hardware raid controller but rather leave these kind of responsibilities and duties to the ZFS software only.

The raid controller would be a potential single point of failure that is outside the influence of ZFS.

https://arstechnica.com/information...01-understanding-zfs-storage-and-performance/

With 3 disks you could do a RAID-Z1 and should get better performance and storage utilization than by a pure mirror setup.
https://web.archive.org/web/2016102...2.2C_RAIDZ-3.2C_or_a_Mirrored_Storage_Pool.3F

 

[opt-jgervais]

Raid can be disable so it's ok but i can also use raid without ZFS. ZFS is so efficient for proxmox OS compare to hardware raid ?
I can only plug 2 SSD so Raid-Z1 wont be a solution. Performance should be enough with ZFS mirror no ?

 

[binaryanomaly]

I think in terms of efficiency it won't probably matter much whether you use raid1 or ZFS mirror. But if you want to use ZFS then mirror is to be preferred over raid. Of course you can also do raid1 with ext4, etc.

Performance of raid1 or ZFS mirror will be as if you have 1 disk and likely good enough.

It sounds a bit as if for your use case either one will be good enough.