New backup server

[Gandalf Corvotempesta]

Hi guys, I have a supermicro to use as backup storage server.
The board is an LSI3008 HBA, that should be OK, i'm already using it with success on other machines.

The question is: which raid level should I use ? RAID-Z2 ? RAID10 ?

Performance is not an issue (obviously, it should not "sit" on every backup that I run) but data-loss is. It's a backup, but as we all know , if you loose the backup server, in that precise time, you'll have issue on primary server :)

I'm planning to use aroud 8TB, so 4x2TB SATA disks plus 2 as parity.
Recovering would be veeeeeeeeeeeeeeeeeeeeeeeeeeeeery slow , right ?
I would like to sleep well during a recovery without worry about sudden failures.

Hint ?

 

[artlessknave]

zfs doesn't have raid10, I assume you mean mirror vdevs (analogous but NOT terminologically interchangeable).
you would probably have better data protection from raidz2 with 4 drives than mirror (2x mirror with 4 drives can only lose 1 drive from any mirror vdev, while raiz2 can loose any 2 drives) and the same space (2TB *4 /2). however, you would be better with at least 6 drives with raidz2 (or ~8 with raidz3). as a backup server performance should be mostly irelevant, as if you are using snapshots (which you really should) everything after the initial replication should be nigh instant.

Recovering would be veeeeeeeeeeeeeeeeeeeeeeeeeeeeery slow , right ?

I dont see why, though since you haven't followed the forum guidelines and posted your actual hardware, It's inconclusive (if your CPU is D525 everything would be amazingly slow).

 

[artlessknave]

8TB, so 4x2TB SATA disks plus 2 as parity.

or, hang on, is this 6x2TB drives? the wording is confusing. please clarify "I have X number of Y TB drives".
"2 as parity" doesn't apply to mirrors if you have 6 drives, you would either have 3x 2-way mirrors for 1/2 the space and thus 3 "parity" drives, or 2x 3-way mirrors for 1/3 the space and thus...3 "parity" drives (mirrors don't exactly use parity calcs but whatever)