[Ocfs2-users] OCFS2 with Loop device

[Ulf Zimmermann]

You need a shared storage between servers, you can't do local storage on
each server. A local file via loop will not work.

> -----Original Message-----
> From: ocfs2-users-bounces at oss.oracle.com [mailto:ocfs2-users-
> bounces at oss.oracle.com] On Behalf Of living liquid | Christian
> Meisinger
> Sent: 10/03/2008 06:23
> To: ocfs2-users at oss.oracle.com
> Subject: [Ocfs2-users] OCFS2 with Loop device
> 
> hi there
> 
> i try to setup OCFS2 with loop device /dev/loop0
> 
> i've 4 servers running SLES10 SP2.
> internal ip's: 192.168.55.1, .2, .3 and .6
> 
> my cluster.conf:
> --------------------------------------------
> node:
>         ip_port = 7777
>         ip_address = 192.168.55.1
>         number = 0
>         name = www
>         cluster = cawww
> 
> node:
>         ip_port = 7777
>         ip_address = 192.168.55.2
>         number = 1
>         name = www2
>         cluster = cawww
> 
> node:
>         ip_port = 7777
>         ip_address = 192.168.55.3
>         number = 2
>         name = www3
>         cluster = cawww
> 
> node:
>         ip_port = 7777
>         ip_address = 192.168.55.6
>         number = 3
>         name = www4
>         cluster = cawww
> 
> cluster:
>         node_count = 4
>         name = cawww
> --------------------------------------------
> 
> what i did so far is:
>  - create a file for the loop device on each server with: dd
> if=/dev/zero of=/var/lib/ocfs2/cawww bs=1G count=1
>  - setup loop device on each server: losetup /dev/loop0
> /var/lib/ocfs2/cawww
>  - formated the device on www1 : mkfs.ocfs2 -b 4K -C 32K -N 4 -L
> ocfscawww /dev/loop0
>     i read here
>
"http://www.oracle.com/technology/pub/articles/hunter_rac10gr2_iscsi_2.
> html#16"
>     that i need to format only on one server. is this correct?
>  - mount with: mount -t ocfs2 /dev/loop0 /cawww
>     mount works on www1, but not on the other servers
>     (mount.ocfs2: Bad magic number in superblock while opening device
> /dev/loop0)
>     i tried to format on each server and then mount again with works
> but it then i don't see
>     changes i make in /cawww on the other servers.
> it seems that each server isn't aware of the other servers.
> firewall is disabled on each server.
> maybe ocfs2 doesn't work with a loop device?
> 
> any ideas what the problem could be?
> 
> 
> thanks, christian


Ulf Zimmermann | Senior System Architect

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