Hello everyone,
this is the first time i ever write to a mailing list, please be patient with me (especially for my poor english)…
Im trying to reach my Bachelors Degree in Computer Science, Im doing a Project which involves ceph.
I’am able to setup a ceph Cluster, but there are a few things i can’t Figure out…
As I’am setting up the cluster with virtual machines im facing a little Problem:
clock skew: every time i reboot on node a clock skew is detected. If i restart the Monitor on which the clock skew is detected the Problem is gone. But this is not what i want to show in my presentation. I already enabled the VMware tools, but the Problem persists. Does it make more sense to enable NTP?
It sounds like maybe you're using VM hibernation or something.
Are there any performance Issues to expect if i use a drive with ceph-disk-prepare (or activate) /dev/sdb directly ?
That should be fine.
Are there any (big) performance Issues to expect using these virtual drives instead of „real“ drives?
Well, each of those drives are going to see frequent syncs, so it'll be slow. If it turns out too badly you could set the VM to not pass those kinds of data safety primitives to the real hardware.
-Greg
Kind regards
Florian
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Software Engineer #42 @ http://inktank.com | http://ceph.com
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