Shigure
Dabbler
- Joined
- Sep 1, 2022
- Messages
- 39
I have read a lot about metatdata vdev recently so I generally have the idea. As I'm still pretty new to TrueNAS and ZFS, maybe ask before I do it makes more sense.
I planned a 5-wide RAIDZ2 data pool with 16TB HDDs, and want to add a metadata vdev to it. I have 4x 1TB SATA SSDs laying around so here is what I'm thinking:
The 2 options are: 4 wide RAIDZ2 as metadata vdev, or 3-way mirror with 1 hotspare as metadata vdev.
3-way mirror will be slightly faster than RAIDZ2 for metatdata because those are all small files(I assume.) Both allows 2 drives to fail, but 3-way mirror comes with a hotspare in addition. And 1TB metatdata should be enough for a 5-wide RAIDZ2 with 16TB HDDS(about 2.5% of storage taking account of the 20% free capacity suggestion of ZFS).
So I should go for 3-way mirror, is that correct?
(Still waiting for a bifurcation card and an extension cable to arrive so don't really have the ability to test...)
I planned a 5-wide RAIDZ2 data pool with 16TB HDDs, and want to add a metadata vdev to it. I have 4x 1TB SATA SSDs laying around so here is what I'm thinking:
The 2 options are: 4 wide RAIDZ2 as metadata vdev, or 3-way mirror with 1 hotspare as metadata vdev.
3-way mirror will be slightly faster than RAIDZ2 for metatdata because those are all small files(I assume.) Both allows 2 drives to fail, but 3-way mirror comes with a hotspare in addition. And 1TB metatdata should be enough for a 5-wide RAIDZ2 with 16TB HDDS(about 2.5% of storage taking account of the 20% free capacity suggestion of ZFS).
So I should go for 3-way mirror, is that correct?
(Still waiting for a bifurcation card and an extension cable to arrive so don't really have the ability to test...)