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I’m doing
some basic testing of CEPH to see if it will fit our needs. My current
test deployment consists of 2 servers, each running a single Monitor process, 4
OSD’s, and separate 1gbit public and private networks. I then have another
server that is just acting as a client using rados/rbd. I have collectl
–sD –oT running on each storage server so that I can monitor the stats of each
disk. On the client server I’m running the following...
rbd
bench-write benchdisk --io-size 256 --io-threads 256
and then
I’m watching the collectl stats. What I’m seeing is a single disk/osd only
being used on both storage hosts. Every so often I see another disk show
some IO but nothing consistent and it’s only on one other drive. I’m
seeing this on both storage servers. What would cause this? Shouldn’t all
the disks be doing some work?
btw, My
ceph configs are basic, nothing special, all the drives in the storage servers
are the same make/model.
Here’s a
screencast showing everything going for 2 minutes
--
Shaun
R. |
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