[root@centos6-ocfs2-1 ~]# mounted.ocfs2 -d
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Device Stack Cluster F UUID Label
/dev/sdb o2cb 7C477028C9F942C1BC5CAFF2B24A7A5A
/dev/sdb1 o2cb 0AFD511ACB744A5BB7EC21BAF3323883 ocfs2
/dev/drbd0 o2cb 0AFD511ACB744A5BB7EC21BAF3323883 ocfs2
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[root@centos6-ocfs2-2]# /etc/init.d/drbd force-reload;# Update driver;
[root@centos6-ocfs2-2]# /etc/init.d/drbd restart; # Or restart;
[root@centos6-ocfs2-2 drbd.d]# mounted.ocfs2 -d
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Device Stack Cluster F UUID Label
/dev/sdb o2cb 99BF2CA35AD1498CA2D8EA9315F0605D
/dev/sdb1 o2cb 0AFD511ACB744A5BB7EC21BAF3323883 ocfs2
/dev/drbd0 o2cb 0AFD511ACB744A5BB7EC21BAF3323883 ocfs2
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────────────────────────────────────────────────────────────────────────────────
Switch the DRBD in Active-Active mode
────────────────────────────────────────────────────────────────────────────────
# vi /etc/drbd.d/ocfs2.res;
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# DRBD resource for OCFS2 storage
resource ocfs2 {
protocol C;
startup {
become-primary-on both;
}
net {
allow-two-primaries;
after-sb-0pri discard-zero-changes;
after-sb-1pri discard-secondary;
after-sb-2pri disconnect;
}
on centos6-ocfs2-1 {
device /dev/drbd0;
disk /dev/sdb1;
address 192.168.56.201:7789;
meta-disk internal;
}
on centos6-ocfs2-2 {
device /dev/drbd0;
disk /dev/sdb1;
address 192.168.56.202:7789;
meta-disk internal;
}
}
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Note: Add startup{} and net{} on both nodes, not need to changing other settings.
参数解释：
allow-two-primaries
- Generally, DRBD has a primary and a secondary node. In this case, we will allow
both nodes to have the filesystem mounted at the same time. Do this only with
a clustered filesystem. If you do this with a non-clustered filesystem like
ext2/ext3/ext4 or reiserfs, you will have data corruption. Seriously!
after-sb-0pri discard-zero-changes
- DRBD detected a split-brain scenario, but none of the nodes think they're a primary.
DRBD will take the newest modifications and apply them to the node that didn't have any changes.
after-sb-1pri discard-secondary
- DRBD detected a split-brain scenario, but one node is the primary and the other is the secondary.
In this case, DRBD will decide that the secondary node is the victim and it will sync data
from the primary to the secondary automatically.
after-sb-2pri disconnect
- DRBD detected a split-brain scenario, but it can't figure out which node has the right data.
It tries to protect the consistency of both nodes by disconnecting the DRBD volume entirely.
You'll have to tell DRBD which node has the valid data in order to reconnect the volume.
Use extreme caution if you find yourself in this scenario.
[root@centos6-ocfs2-1]# /etc/init.d/drbd restart;
(Waiting to the restart untill it successfully,and then restart node2's DRBD)
[root@centos6-ocfs2-2]# /etc/init.d/drbd restart;