Added a fifth OSD node. Cluster now looks something like:
3x mons (2x 10G, 2x E5-2690 V2, 256GB RAM)
5x OSD (2x 10G, 2x e5-2690 V2, 256GB-385GB RAM, 12x Samsung SM1625 SSDs)
Random write latency went up to 16ms average with the addition of the fifth
node, and k=3,m=2.
What kind of latencies
please do not even think about using an EC pool (k=2, m=1). See other
posts here, just don't.
Why not?
--
With best regards,
Vitaliy Filippov
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I should mention this is solely meant as a test cluster, and unfortunately I
only have four OSD nodes in it. I guess I’ll go see if I can dig up another
node so I can better mirror what might eventually go to production.
I would imagine that latency is only going to increase as we increase k
Hello,
please do not even think about using an EC pool (k=2, m=1). See other posts
here, just don't.
EC works quite well and we have a lot of users with EC based VMs often with
proxmox (rbd) oder vmware (iscsi) hypervisors.
Performance depends on the hardware and is definitely slower than
