Hard disk setup with SSD

[Itobin]

Hi,

Im building a new NAS system, it will have the following

Ryzen 7 5700 CPU
64GB RAM
1 x 10GB ISCSI nic

As SSD is expensive im stuck with what to do with the disks.

My initial plan was to buy 8 x 4TB SSDs, create 4 x Mirrored VDEVs, the problem i see with this is im waisting a lot of ££ on unused storage although redundant.

If I were to buy 6 x 4TB SDD and create a RAIDZ, does anyone see any reason why I shouldnt do this? SSD is obviously more reliable.

Any thoughts?

thanks

 

[Arwen]

I am not sure what you meant by;

8 x 4TB SSDs, create 4 x Mirroed VDEVs and then created RAIDZ on top

ZFS does not support nested RAID levels, nor using hardware RAID. Perhaps you can clarify.

However, you mention iSCSI, which implies you will have zVols for VM storage. The 6 x 4TB on RAID-Zx, even though fast, may have block storage issues because of striping. Meaning unless you tune the zVol block size, VM block size, RAID-Zx ashift size the results might be oddly amount of wasted space.

I don't have all the details, here is some further information;

The path to success for block storage

jgreco submitted a new resource: The path to success for block storage - Really good advice for a really difficult thing ZFS does two different things very well. One is storage of large sequentially-written files, such as archives, logs, or data files, where the file does not have the middle...

www.truenas.com

Of course, if you are not using iSCSI, then RAID-Zx should be fine.

 

[Itobin]

appologies, that was me not thinking correctly, i meant just Mirrored vdevs - forget the raidz on top part.

Yes, this will be used for storing VM data, proxmox will be installed on another 3 servers connected to the nas via ISCSI using 10GB.