alexanderniebuhr
Dabbler
- Joined
- Dec 26, 2023
- Messages
- 17
I'm currently building a new TrueNAS Scale Server (256GB DDR4, Epyc 16Core, 40G Network). It'll have multiple pools. The planned layouts for the beginning are (it will be scaled in the future, once more space is needed):
- 3 x MIRROR | 2 wide | 18TB SATA HDD
- 1 x RaidZ2 | 6 wide | 20TB SATA HDD
Now I want to add some SSDs to the Server as cache, I personally don't thing L2ARC is needed, but Log & Metadata vdevs might be good.
However I'm confused about the best SSD to buy and a good layout.
Layout wise I'm thinking about 3-way mirrors, to protect those vdevs, is that needed?
As for Hardware, I would like to keep the initial cost reasonable, so I'm not planning to go with enterprise SSDs, and going used is risky for SSDs.
Looking at SSD options, there are multiple metrics to consider, which should I focus on?
- 3 x MIRROR | 2 wide | 18TB SATA HDD
- 1 x RaidZ2 | 6 wide | 20TB SATA HDD
Now I want to add some SSDs to the Server as cache, I personally don't thing L2ARC is needed, but Log & Metadata vdevs might be good.
However I'm confused about the best SSD to buy and a good layout.
Layout wise I'm thinking about 3-way mirrors, to protect those vdevs, is that needed?
As for Hardware, I would like to keep the initial cost reasonable, so I'm not planning to go with enterprise SSDs, and going used is risky for SSDs.
Looking at SSD options, there are multiple metrics to consider, which should I focus on?
- Read/Write MB/s
IOPS 4k - TBW
- DWPD
- MTBF
- MTTF