Hi Friends,
Is Ceph copy on write system?
If so, I think I do something wrong.
Files copying take too much time and disks space in my Ceph installation.
Could you like to help me resolve my problem?
I am using Ubuntu 11.10 server with ceph packages from ubuntu repository
(v. 0.34-1).
-------------------------------------------------------------------------------------------------
df -h
192.168.2.11:/OpenNebula/ 1417063424 25535488 1228367872 3%
/srv/ceph/OpenNebula
oneadmin@s2-8core:/srv/ceph/OpenNebula/one/tests$ date; cp -rv
W7-Peter.iso temp/ ; date
Thu Nov 3 21:01:13 EDT 2011
`W7-Peter.iso' -> `temp/W7-Peter.iso'
Thu Nov 3 21:03:02 EDT 2011
oneadmin@s2-8core:/srv/ceph/OpenNebula/one/tests$
df -h
192.168.2.11:/OpenNebula/ 1417063424 29011968 1224902656 3%
/srv/ceph/OpenNebula
oneadmin@s2-8core:/srv/ceph/OpenNebula/one/tests$ ls -la
total 3149408
drwxr-xr-x 1 oneadmin cloud 6449987584 2011-11-03 20:18 .
drwxr-xr-x 1 oneadmin cloud 18997465448 2011-11-03 19:20 ..
drwxr-xr-x 1 oneadmin cloud 3224993792 2011-11-03 21:01 temp
-rw-r--r-- 1 oneadmin cloud 3224993792 2011-11-03 19:29 W7-Peter.iso
oneadmin@s2-8core:/srv/ceph/OpenNebula/one/tests$
mount:
/dev/sda3 on /srv/osd.1 type btrfs (rw,noatime)
192.168.2.11:/OpenNebula/ on /srv/ceph/OpenNebula type ceph
(name=admin,key=client.admin)
-----------------------------------------------------------------------
it took 129 seconds ~ 30 Mb/s. It is great rate for network file system
but it is not good for "copy-on-write" system
other operations work well:
------------------------------------------
oneadmin@s2-8core:/srv/ceph/OpenNebula/one/tests$ date; mv -v
W7-Peter.iso temp/ ; date
Thu Nov 3 21:11:15 EDT 2011
`W7-Peter.iso' -> `temp/W7-Peter.iso'
Thu Nov 3 21:11:15 EDT 2011
oneadmin@s2-8core:/srv/ceph/OpenNebula/one/tests$ date; mkdir
.snap/my_snapshot; date
Thu Nov 3 22:57:24 EDT 2011
Thu Nov 3 22:57:25 EDT 2011
oneadmin@s2-8core:/srv/ceph/OpenNebula/one/tests$
Thanks,
Max
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