Hi,
On 06/06/2012 12:24 PM, udit agarwal wrote:
Hi,
I have a query regarding the way to determine the no. of replicas that are
created for each object in the ceph storage system. I couldn't find a way to
determine this. please help me with this.
The number of replicas is set by the "rep size" attribute of the pool
you are storing the object in.
$ ceph osd dump -o -|grep "rep size"
That will show something like:
pool 0 'data' rep size 3 crush_ruleset 0 object_hash rjenkins pg_num
2560 pgp_num 2560 lpg_num 2 lpgp_num 2 last_change 91 owner 0
crash_replay_interval 45
pool 1 'metadata' rep size 3 crush_ruleset 1 object_hash rjenkins pg_num
2560 pgp_num 2560 lpg_num 2 lpgp_num 2 last_change 90 owner 0
pool 2 'rbd' rep size 3 crush_ruleset 2 object_hash rjenkins pg_num 2560
pgp_num 2560 lpg_num 2 lpgp_num 2 last_change 630 owner 0
removed_snaps [1~1]
In this case all the pools have a "size" of 3, which means all objects
stored in these pools will be replicated three times.
You can change this parameter with:
$ ceph osd pool set <pool> size <size>
Wido
Thanks in advance.
--Udit Agarwal
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