Re: ceph for small cluster?

[Miles Fidelman <mfidelman@meetinghouse.net>]

Matt, Thanks for the comments.  A follow-up if I might (inline):

Matthew Roy wrote:
> What I'm not doing that you'd need to test is running VMs on the same 
> servers as storage. I'd be careful about mounting RBD volumes on the 
> OSDs, you can run into kernel deadlock trying to write out things to 
> physical disk when trying to write to the mounted volume. Mounts 
> inside VMs should be okay. 

I was thinking of running pinning one CPU to DomO and running the OSD 
from there, and mounting RBD volumes only in DomUs.  And leaving a bit 
of disk space outside the OSD for booting and Dom0.

Which raises another question: how are you combining drives within each 
OSD (raid, lvm, ?).

Thanks again,

Miles


-- 
In theory, there is no difference between theory and practice.
In practice, there is.   .... Yogi Berra