Hello.
I have a small proxmox/ceph cluster:
- 3 x Dell CS24, each with:
- 2 x xeon CPU
- 24 Gbyte ram
- 1 x 500Gbyte SATA disk (used for proxmox)
- 3 x 2Tbyte WD2000F9YZ SATA Enterprise Edition (used for ceph OSDs)
- 1 x Gbit ethernet (used for ceph and proxmox)
- 1 x Gbit ethernet (used for vms ethernet)
What is strange is that on OSD tree I have high latency: tipically Apply
latency is between 5 and 25, but commit lattency is between 150 and 300 (and
sometimes 5/600), with 5/10 op/s and some B/s rd/wr (i have only 3 vms, and
only 1 is working now, so the cluster is really unloaded).
I am using a pool with 3 copies, and I have increased pg_num to 256 (the
default value of 64 is too low); but OSD latency is the same with a different
pg_num value.
I have other clusters (similar configuration, using dell 2950, dual ethernet
for ceph and proxmox, 4 x OSD with 1Tbyte drive, perc 5i controller), with
several vlms, and the commit and apply latency is 1/2ms.
Another cluster (test cluster) with 3 x dell PE860, with only 1 OSD per node,
have better latency (10/20 ms).
What can i check ?
Thank's in advance, Fabrizio
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Fabrizio Cuseo - mailto:[email protected]
Direzione Generale - Panservice InterNetWorking
Servizi Professionali per Internet ed il Networking
Panservice e' associata AIIP - RIPE Local Registry
Phone: +39 0773 410020 - Fax: +39 0773 470219
http://www.panservice.it mailto:[email protected]
Numero verde nazionale: 800 901492
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