Title: ProActive Software
Hi Richard,
You're useing ext3 as filesystem, this filesystem does not support
'dual primary' mode. You need GFS or OCFS2.
Have a look:
http://www.drbd.org/users-guide/s-dual-primary-mode.html
I experimented with OCFS2, but dropped it in the end. However, it
may fit your needs...
Kind regards,
Dirk
On 17-04-14 19:58, Richard Whittaker
wrote:
Hi all:
I am new to DRBD, and I think I have it setup correctly, but
wanted to check my assumptions at the door. I have two nodes
connected over a VPN link, and they are geographically separated
by about 15 kilometres. Their connection is not mind blowingly
fast, but I am not looking for true realtime I/O. I am looking to
replicate, at the block level, a qmail messaging store between the
two nodes, and I like the idea of block level replication, because
if a message comes in, I don't have to replicate the user's entire
message store like I believe Unison would do.
Block level replication would also be, I believe truly
bi-directional.
So, for my testing I have created a dual primary drbd called
/dev/drbd1.
Looking at /proc/drbd on both nodes shows an active
Primary/Primary device.
[root@defiant tmp]# cat /proc/drbd
version: 8.3.15 (api:88/proto:86-97)
GIT-hash: 0ce4d235fc02b5c53c1c52c53433d11a694eab8c build by
[email protected], 2013-03-27 16:04:08
1: cs:Connected ro:Primary/Primary ds:UpToDate/UpToDate C r-----
ns:1728 nr:524052 dw:525780 dr:5798 al:4 bm:44 lo:0 pe:0 ua:0
ap:0 ep:1 wo:b oos:0
[root@defiant tmp]#
The device is mounted on both systems.
/dev/drbd1 on /var/tmp type ext3 (rw)
The config on both nodes is identical.
global {
usage-count yes;
}
common {
protocol C;
}
resource mailstore {
net {
allow-two-primaries;
after-sb-0pri discard-least-changes;
after-sb-1pri discard-secondary;
}
startup {
become-primary-on both;
}
on defiant.avits.ca {
device /dev/drbd1;
disk /dev/sdc;
address 192.168.0.4:7789;
meta-disk internal;
}
on illustrious.avits.ca {
device /dev/drbd1;
disk /dev/sdb;
address 192.168.64.4:7789;
meta-disk internal;
}
}
Now to my logic, if I write a file to one node, it should show up
on the other. So on 192.168.0.4, I do an ls -l /etc
>/var/tmp/blah.txt, it should show up on BOTH systems with the
same size and date stamp.
...Node 1.
[root@defiant tmp]# ls -l /etc >/var/tmp/blah.txt
[root@defiant tmp]# ls -l /var/tmp
total 16
-rw-r--r-- 1 root root 15893 Apr 17 10:53 blah.txt
[root@defiant tmp]#
...Node 2.
[root@illustrious ~]# ls -l /var/tmp
total 32
drwx------ 10 vpopmail vchkpw 4096 Nov 17 21:09 avits.ca
-rw-r--r-- 1 vpopmail vchkpw 165 Apr 16 13:46 blah3.txt
-rw-r--r-- 1 vpopmail vchkpw 2532 Apr 16 13:55 blah.txt
drwx------ 5 vpopmail vchkpw 4096 Aug 14 2013 example.com
drwx------ 21 vpopmail vchkpw 16384 Apr 15 14:45 lost+found
[root@illustrious ~]#
...and yet the filesystems are dissimilar. Note the stuff that is
there on one node, but not the other, and that the date stamp for
the file that exists on both is wrong on the second node.
Am I missing something, or am I expecting drbd to do something
it's not capable of doing?...
Thanks,
Richard.
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