I'm planning to move our metadata disks from a collection of JBODs to raid 10 sets. Presently the filesystem looks like this:
12 metadata drives (each 600G 15K SAS) for 12 dataOnly LUNs (about 250TB total). The 12 drives live on 4 physical raid chassis.
I've always been very underwhelmed with our metadata performance and I'm wondering whether instead of 12 JBODs, I make 4 raid10 arrays. I'd lose some space but I'm only using about 13% of the total metadata disk so have plenty to spare.
Of course, I also will like the fact that our filesystem couldn't be damaged by the simultaneous fail of only 2 drives, one from each of our two failure group.
As for performance, can anyone address what I might see when moving to 4 R10 NDS vs. 12 JOB NDS?