ceph server configuration question

M

mygeeknc

Renowned Member
Jan 31, 2013
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I'm looking at either purchasing a new nas unit to replace a freenas install we currently have or switching to ceph for storage. I currently have 4 proxmox 3.2 servers each with a single SSD for the OS (i know it doesn't help performance to be on an ssd). Each node has dual xeon l5520's with 40GB of RAM. I have two FreeNAS servers serving the disk over NFS to the nodes.

My question is, to move to a ceph setup, from my understanding, I'd have to equip each node with several SATA/SAS drives and then a couple of more SSD's for ceph logs. Does each node need something like an HBA or RAID controller for this to work?
 
You do not need a RAID card for CEPH tho using one with battery backed write cache might be beneficial.
I am using plain old SATA ports on the motherboard with twelve 4TB SATA disks in three nodes ( 4 disks/node) and it works ok.

From what I have read, the more OSDs (disks) you have the better it performs.
You can also use a SSD for CEPH journals to help increase performance but I choose not to do so to keep things simple.
 
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