From Gregory and Craig in mailing list...
Gregory Farnum http://lists.ceph.com/pipermail/ceph-users-ceph.com/2014-June/040961.html %} "ceph osd crush reweight" sets the CRUSH weight of the OSD. This weight is an arbitrary value (generally the size of the disk in TB or something) and controls how much …
Realtime :
mount -o discard /dev/rbd0 /mnt/myrbd
Using batch :
fstrim /mnt/myrbd
The empty FS :
$ rbd create rbd/myrbd --size=20480
$ mkfs.xfs /dev/rbd0
$ rbd diff rbd/myrbd | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }'
14.4062 MB
With a big file... :
$ mount /dev/rbd0 …The purpose of this test is to map a RadosGw Bucket to a specific Ceph pool. For exemple, if using a fast pool with ssd and a low pool for archive...
standard_bucket datas --> .rgw.buckets (default pool)
specific_bucket datas --> .rgw.buckets.custom
First, we create a pool .rgw.buckets.custom …
Update on Apr 14th, 2016: LXC 2.0.0 First Support for Ceph RBD : http://cephnotes.ksperis.com/blog/2016/04/14/lxc-2-dot-0-0-first-support-for-ceph-rbd %}
A simple way to secure your data with containers is to use a distributed storage such as Ceph for LXC root storage.
For exemple :
# lxc-create -n mycontainer …A quick howto to install OpenNebula 4.8 with support for Ceph on Debian Wheezy.
$ onedatastore show cephds
DATASTORE 101 INFORMATION
ID : 101
NAME : cephds
USER : oneadmin
GROUP : oneadmin
CLUSTER : -
TYPE : IMAGE
DS_MAD : ceph
TM_MAD : ceph
BASE PATH : /var/lib/one//datastores/101
DISK_TYPE : RBD
Install …