Re: OSD per disk.

[chandrashekhar <chandubigc@gmail.com>]

Alexandre DERUMIER <aderumier <at> odiso.com> writes:

> 
> Hi, just defined osds in ceph.conf, they mount each disk in correct mountpoint.
> 
> this example : 
> 1st server :
>   /dev/sdb1 -> /data/osd0
>   /dev/sdc1 -> /data/osd1
>   /dev/sdd1 -> /data/osd2
>   ....
> same for journal.(you can use differents disk for journal or use another
partition on same disk)
> 
> ceph.conf
> [osd] 
> 
> osd data = /data/osd$id 
> osd journal = /data/osd$id/journal 
> osd journal size = 512 
> 
> [osd.0] 
> host = ceph-node-1 
> 
> [osd.1] 
> host = ceph-node-1 
> 
> [osd.2] 
> host = ceph-node-1 
> 
> [osd.3] 
> host = ceph-node-2 
> 
> [osd.4] 
> host = ceph-node-2 
> 
> ----- Mail original ----- 
> 
> De: "chandrashekhar" <chandubigc <at> gmail.com> 
> À: ceph-devel <at> vger.kernel.org 
> Envoyé: Lundi 28 Mai 2012 08:19:17 
> Objet: OSD per disk. 
> 
> Hi, 
> 
> I want to setup a ceph cluster with 4 osds ( one OSD per disk), 2 mons, 1 
> mds. Please help me to configure this. 
> 
> I have a machine with following hardware: 
> 
> 4 hard disks ( each 500GB). 
> 
> /dev/sda - 500G ( OS ) 
> /dev/sdb - 500G 
> /dev/sdc - 500G 
> /dev/sdd - 500G 
> 
> OS: ubuntu 12.O4 server ( 64 bit ) 
> 
> Thanks, 
> Chandra. 
> 

Thanks Alexandre,  I created four directories in /data  (osd0,osd1,osd2,osd3) 
and mounted as below:

/dev/sdb1 -> /data/osd1
/dev/sdc1 -> /data/osd2
/dev/sdd1 -> /data/osd3


But when I start ceph its starting mons and md daemons but not osds. Please help
me to get this working.

>ceph -w
2012-05-28 14:43:23.756895    pg v2: 792 pgs: 792 creating; 0 bytes data, 0 KB
used, 0 KB / 0 KB avail
2012-05-28 14:43:23.762160   mds e1: 0/0/1 up
2012-05-28 14:43:23.762296   osd e1: 0 osds: 0 up, 0 in
2012-05-28 14:43:23.762586   log 2012-05-28 14:24:15.391671 mon.0
192.168.7.10:6789/0 4 : [INF] mon.a@0 won leader election with quorum 0,1
2012-05-28 14:43:23.762741   mon e1: 2 mons at
{a=192.168.7.10:6789/0,b=192.168.7.10:6790/0}




Here is my ceph.conf:
-------------------------------------------------
[global]
   auth supported = cephx
   keyring = /etc/ceph/keyring.admin

[mon]
   mon data = /data/mon.$id

[mds]

[osd]
   osd data = /data/osd$id
   osd journal = /data/osd$id/osd.$id.journal
   osd journal size = 1000



[mon.a]
   host = testnode
   mon addr = 192.168.7.10:6789
[mon.b]
  host = testnode
  mon addr = 192.168.7.10:6790

[osd.0]
   host = testnode

[osd.1]
   host = testnode

[osd.2]
   host = testnode

[osd.3]
   host = testnode
[mds.a]
   host = testnode




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