Hi,
I'm running a 3-node Ceph cluster for VM block storage (Proxmox/KVM).
Replication is set to 3.
Previously, we were running 1 x Intel Optane 905P 960B disk per node, with 4 x OSDs per drive, for total usable storage of 960 GB.
Performance was good, even without significant tuning, I assume largely because of the Optane disks.
However, we need more storage space.
We have some old 800 GB SSDs we could potentially use (Intel S3610).
I know it's possible to put the WAL/RocksDB on an Optane disks, and have normal SSDs for the OSDs. I assume we'd go down to a single OSD per disk if running normal SATA SSDs. However, other people are saying the performance gain from this isn't that great (e.g. https://yourcmc.ru/wiki/Ceph_performance)
Each of our 3 nodes has 8 drive bays, so we could populate this for 24 x 800GB SSDs in total. My question is:
- For the Intel S3610 - should we still run with 1 OSD per disk?
- How does performance (IOPS and latency) scale as the number of disks increase? (This is for VM block storage).
Thanks,
Victor
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