In just the last week I've seen at least two failures as a result of replication factor two. I would highly suggest that for any critical data you choose an rf of at least three.
With your stated capacity, you're looking at a mere 16TB with rf3. You'll need to look into slightly more capacity or wait for erasure to come down the line. Or go with the more dangerous rf2.
On Feb 18, 2014 12:41 PM, "shacky" <shacky83@xxxxxxxxx> wrote:
Hi.I have to create a new Ceph cluster with 3 nodes with 4 hard drives in RAID5 (12Tb available per node).I will need 18Tb of available space, so I will create two OSDs per node with a replication factor of 2, and my data will be safe if a node will fail, right?Can you advise me a good configuration for this scenario?How much OSDs, how much Mons?I will have to store thousands of small files (images and videos).Do you advise me to use the Ceph filesystem or the Ceph Object Storage?Thank you very much!Bye.
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