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Best Disk Layout

Hello,

I'm looking for the best layout for all of the disks, what would your recommendation be for Journal, Cache, OSD? Trying to get the largest overall volume with the best performance and each of the 3 servers have identical hardware listed below. Just confused about how many Journals/Cache drives are needed, I'm guessing set each 900GB as a OSD?

Dell R720xd
Dual Xeon E5-3667 3.3GHz 8cores
512GB Memory
OS - 1 300GB SSD
6 - 1.6TB SSD
18 - 900GB 10K HDD
2 Fusion Cards (Not sure if compatible or usable with PetaSAN but they are installed)
2 - Dual 10GB Nics

Thanks for the help

I would use the SSDs as journals to the HDD OSDs, at a ratio of 1:4

You can also use a ratio of 1:5 and have 2 extra SSDs and create another pure SSD pool if you have high iops load.

 

Excellent thank you! Should I not worry about any type of Cache?

I've also got some Fusion IO cards in the system but guessing a driver issue for PetaSAN not seeing them. Have you had any luck or know of anyone using them?