[Ocfs2-users] OCFS2 over VPN

[Lorenzo Milesi]

Hi

I've set up a DRBD8 Active/Active configuration over two remote places,
connected via 2 bonded (Open)VPNs on 2 ADSL connection, OCFS2 fs. 
The two systems are both Debian Etch, kernel 2.6.22-4-686, DRBD v8.0.11,
OCFS2 1.3.3.

I know the solution is quite hazardous, but so far has been working
better than I expected. The big issue is that it's very unstable,
because it's suffering network leaks. Now that I've bonded two VPNs this
problem should be less critical.
I have also enabled QoS to give high priority to OCFS2 and DRBD ports.
Sometimes it can go straight without problems for weeks, sometimes it
fails every other hour. 

I realized OCFS2 is very sensible to network leaks. I tried raising
values to the maximum but still quite often I get:

server-2 kernel: o2net: connection to node server-1 (num 1) at
192.168.0.4:7777 has been idle for 20.0 seconds, shutting it down.
server-2 kernel: (0,0):o2net_idle_timer:1419 here are some times that
might help debug the situation: (tmr 1225887463.671970 now 1225887
483.668529 dr 1225887463.671962 adv 1225887463.671974:1225887463.671975
func (57b88650:500) 1225887463.671971:1225887463.671972)
server-2 kernel: o2net: no longer connected to node server-1 (num 1) at
192.168.0.4:7777

My conf for o2cb is:
O2CB_HEARTBEAT_THRESHOLD=50
O2CB_IDLE_TIMEOUT_MS=20000

Is there any other possible tuning I can do?
Is it possible to also decide which node gets panic'ed?

Thanks...
-- 
Lorenzo Milesi - lorenzo.milesi at yetopen.it

YetOpen S.r.l. - http://www.yetopen.it/
C.so E. Filiberto, 74 23900 Lecco - ITALY -
Tel 0341 220 205 - Fax 178 607 8199

GPG/PGP Key-Id: 0xE704E230 - http://keyserver.linux.it

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Grazie.