Hello Guys
Doing hardware planning / selection for a new production Ceph cluster. Just wondering how should i select memory.
I have found two different rules of selecting memory for Ceph OSD.( on Internet / googling / presentations )
#1 1GB / Ceph OSD or 2GB / Ceph OSD ( for more performance )
For Example : 12 OSD system it will be 12GB or 24GB. In this case don't the disk size matter ??
4TB Drive : 12 X 4 = 48TB Raw storage ( is 24GB sufficient ? )
6TB Drive : 12 X 6 = 72 TB Raw storage ( is 24 GB Sufficient ? )
#2 1GB / 1TB of RAW capacity of system
4TB Drive : 12 X 4 = 48TB Raw storage ( is 48GB is more than enough ? )
6TB Drive : 12 X 6 = 72 TB Raw storage ( is 72GB is more than enough ? )
In case of Dense node
72 x 6TB = 432TB Raw storage ( 432G memory seems to be HUGE investment ? )
So which rule should we considered that can stand true for a 12 OSD node and even for 72 OSD node.
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