On CEPH
Set tunables to legacy
# ceph osd crush tunables legacy
Disable chooseleaf_vary_r
# ceph osd getcrushmap -o /tmp/mycrushmap
# crushtool -d /tmp/mycrushmap > /tmp/mycrushmap.txt
chooseleaf_vary_r 0
# crushtool -c /tmp/mycrushmap.txt -o /tmp/mycrushmap.new
# ceph osd setcrushmap -i /tmp/mycrushmap.new
Create RBD image
# rbd create pool/image --size 512G --image-shared
Remove Deep-flatten feature
# rbd feature disable pool/image deep-flatten
On XenServer
# modprobe rbd (make sure the are no errors)
# xe sr-create type=lvmoiscsi name-label=RBD IMAGE NAME shared=true device-config:target=CEPH MONITOR IP device-config:port=6789 device-config:targetIQN=RBD POOL NAME device-config:SCSIid=MOUNT NAME device-config:chapuser=CEPHUSER device-config:chappassword=PASSWORD
NOTES:
- The GUI option doesn't work, but the above command works every time.
- If you you have more than one XenServer and they are on a Pool, you have to run the sr-create command on one node, then the other(s) pool members will need to rejoin the Pool for the sr to be shared accross the pool. I couldn't get the mounts working on other pool members of an existing pool.
Let me know if you have any questions.
Cheers,
Mike
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