Re: ceph distributed osd

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Hi Luis,

        What i mean , we have three OSD with Harddisk size each 1TB and two pool (poolA and poolB) with replica 2. Here writing behavior is the confusion for us. Our assumptions is below.

PoolA   -- may write with OSD1 and OSD2  (is this correct)

PoolB  --  may write with OSD3 and OSD1 (is this correct)

suppose the hard disk size got full , then how many OSD's need to be added and How will be the writing behavior to new OSD's

After added few osd's 

PoolA --  may write with OSD4 and OSD5 (is this correct)
PoolB --  may write with OSD5 and OSD6 (is this correct)
 
             
Regards
Prabu

---- On Mon, 17 Aug 2015 19:41:53 +0530 Luis Periquito <periquito@xxxxxxxxx> wrote ----

I don't understand your question? You created a 1G RBD/disk and it's full. You are able to grow it though - but that's a Linux management issue, not ceph.

As everything is thin-provisioned you can create a RBD with an arbitrary size - I've create one with 1PB when the cluster only had 600G/Raw available.

On Mon, Aug 17, 2015 at 1:18 PM, gjprabu <gjprabu@xxxxxxxxxxxx> wrote:

Hi All,

           Anybody can help on this issue.

Regards
Prabu

---- On Mon, 17 Aug 2015 12:08:28 +0530 gjprabu <gjprabu@xxxxxxxxxxxx> wrote ----

Hi All,

               Also please find osd information.

ceph osd dump | grep 'replicated size'
pool 2 'repo' replicated size 2 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 126 pgp_num 126 last_change 21573 flags hashpspool stripe_width 0

Regards
Prabu




---- On Mon, 17 Aug 2015 11:58:55 +0530 gjprabu <gjprabu@xxxxxxxxxxxx> wrote ----



Hi All,

   We need to test three OSD and one image with replica 2(size 1GB). While testing data is not writing above 1GB. Is there any option to write on third OSD.

ceph osd pool get  repo  pg_num
pg_num: 126

# rbd showmapped
id pool image          snap device    
0  rbd  integdownloads -    /dev/rbd0 -- Already one
2  repo integrepotest  -    /dev/rbd2  -- newly created


[root@hm2 repository]# df -Th
Filesystem           Type      Size  Used Avail Use% Mounted on
/dev/sda5            ext4      289G   18G  257G   7% /
devtmpfs             devtmpfs  252G     0  252G   0% /dev
tmpfs                tmpfs     252G     0  252G   0% /dev/shm
tmpfs                tmpfs     252G  538M  252G   1% /run
tmpfs                tmpfs     252G     0  252G   0% /sys/fs/cgroup
/dev/sda2            ext4      488M  212M  241M  47% /boot
/dev/sda4            ext4      1.9T   20G  1.8T   2% /var
/dev/mapper/vg0-zoho ext4      8.6T  1.7T  6.5T  21% /zoho
/dev/rbd0            ocfs2     977G  101G  877G  11% /zoho/build/downloads
/dev/rbd2            ocfs2    1000M 1000M     0 100% /zoho/build/repository

@:~$ scp -r sample.txt root@integ-hm2:/zoho/build/repository/
root@integ-hm2's password:
sample.txt                                                                                                             100% 1024MB   4.5MB/s   03:48    
scp: /zoho/build/repository//sample.txt: No space left on device

Regards
Prabu




---- On Thu, 13 Aug 2015 19:42:11 +0530 gjprabu <gjprabu@xxxxxxxxxxxx> wrote ----



Dear Team,

         We are using two ceph OSD with replica 2 and it is working properly. Here my doubt is (Pool A -image size will be 10GB) and its replicated with two OSD, what will happen suppose if the size reached the limit, Is there any chance to make the data to continue writing in another two OSD's.

Regards
Prabu







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