Special device redundancy for a raidz2 zfs pool

[atatury]

Hello all,

Let's consider a raidz2 zfs pool of 6 hdd drives and a special device consisting of ssd drives will be created. From the docs, it's not clear the redundancy of a special device; exactly how many ssd drives shoul be used to form the special device?

Thank you..

 

[UdoB]

You should use the same redundancy as for all other vdevs.

In your RaidZ2 two physical devices may fail without generating data loss. Usually you want the same for that mission-critical "Special Device". Use a tripple mirror for this.

 

[atatury]

You should use the same redundancy as for all other vdevs.

In your RaidZ2 two physical devices may fail without generating data loss. Usually you want the same for that mission-critical "Special Device". Use a tripple mirror for this.

Thank you. I should use or I must use? I mean a can I use a normal double mirror or zfs ony allows a triple mirror ?

Regards..

 

[news]

remember if your "Special Device" fail all your data are lost. for ever!

so use SSD SATA3 with enterprice grade, dram cache and PLP as @UdoB wrote: Use a tripple mirror zfs vdev for this.

 

[atatury]

remember if your "Special Device" fail all your data are lost. for ever!

so use SSD SATA3 with enterprice grade, dram cache and PLP as @UdoB wrote: Use a tripple mirror zfs vdev for this.

Thank you very much guys for your consideration and quick responses..