living liquid | Christian Meisinger
2008-Oct-03 13:22 UTC
[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
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, christianUlf Zimmermann | Senior System Architect OPENLANE 4600 Bohannon Drive, Suite 100 Menlo Park, CA 94025 O: 650-532-6382 M: (510) 396-1764 F: (510) 580-0929 Email: ulf at openlane.com | Web: www.openlane.com
yes, you only need to format from one node. Your first step created a file on each node which is/are not shared between all nodes. OCFS2 needs a shared device if you want to mount the filesystem on multiple nodes. Configure iscsi instead of loopback device. living liquid | Christian Meisinger wrote:> 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 > > > _______________________________________________ > Ocfs2-users mailing list > Ocfs2-users at oss.oracle.com > http://oss.oracle.com/mailman/listinfo/ocfs2-users >