OCFS2+DRBD uses your NIC for transport on these strategy. Better go for
OCFS2 (NIC Transport) + Multipathing(Fibre Channel transport backend) for
less traffic on the NIC.

FYI, stock Debian, Ubuntu and SuSE(and yes, even the latest SLES 11 SP1
addon HA.) use OCFS2 1.4.3. Watch out for these because you may be hit by
the "Orphan file" Bug which I painfully found out. Better use minimum 1.4.4
or higher which fixes these problems. A chicken and egg situation here. The
Oracle project website only has RHEL binaries, so you have to do ala going
back to the Linux compile from scratch 90's.... :)

regards,
Andre | http://www.varon.ca

On Thu, Dec 9, 2010 at 10:20 PM, Linux Cook <linuxc...@gmail.com> wrote:

> hi jan,
>
> I need to mount it on both machines because I'm inserting data from both
> since I'm working on active-active web cluster. Yeah I realized that since
> it cannot be mounted on both machines, I used active-active drbd setup
> instead and mount it using pacemaker.
> So its OCFS2 + DRBD thingy which worked for me.
>
> Thanks for all your inputs guys!
> I really appreciate it.
>
> Oliver
>
>
> On Thu, Dec 9, 2010 at 10:37 PM, jan gestre <plugger.l...@gmail.com>wrote:
>
>>
>>
>> On Wed, Dec 8, 2010 at 3:09 PM, Linux Cook <linuxc...@gmail.com> wrote:
>>
>>> hi guys,
>>>
>>> I bumped into a problem after settingup OCFS2. I'm trying to mount the
>>> OCFS2 filesystem into both nodes by adding it into /etc/fstab but only the
>>> primary node gets the mount. The secondary node didn't mount anything.
>>>
>>> Any thoughts?
>>>
>>> Oliver
>>>
>>>
>>> On Tue, Dec 7, 2010 at 12:01 PM, Linux Cook <linuxc...@gmail.com> wrote:
>>>
>>>> Guys,
>>>>
>>>> Thanks for all your inputs and I really really appreciate it. As I
>>>> mentioned I used OCFS2 with multipathing and that worked for me.
>>>>
>>>> Thanks again!
>>>>
>>>> Oliver
>>>>
>>>> On Tue, Dec 7, 2010 at 11:45 AM, Federico Sevilla III <j...@fs3.ph>wrote:
>>>>
>>>>> Hi Oliver,
>>>>>
>>>>> Assuming you know the risks involved with what you're trying to do,
>>>>> then
>>>>> the missing piece is using what is called a shared disk file system.
>>>>> You
>>>>> already mentioned OCFS2, another option would be GFS (Global File
>>>>> System). I'm not sure if btrfs and ZFS are shared disk file systems,
>>>>> but
>>>>> it's worth a check.
>>>>>
>>>>> The reason "what you are doing is very dangerous" is if you're not
>>>>> using
>>>>> a shared disk file system, you basically end up with lost data at best,
>>>>> but more probably a corrupt and useless file system at the end.
>>>>> "Normal"
>>>>> file systems are used to having exclusive write access to their block
>>>>> device.
>>>>>
>>>>> Good luck, and have fun.
>>>>>
>>>>> Cheers!
>>>>>
>>>>> --
>>>>> Federico Sevilla III, CISSP, CSM, LPIC-2
>>>>> Chief Executive Officer
>>>>> F S 3 Consulting Inc.
>>>>> http://www.fs3.ph
>>>>>
>>>>>
>>>>> On Tue, 2010-12-07 at 11:21 +0800, Linux Cook wrote:
>>>>> > okay some guys told me i should be using ocfs2? would this really
>>>>> > help?
>>>>> >
>>>>> > On Tue, Dec 7, 2010 at 9:50 AM, Jimmy Lim <jimmyb...@gmail.com>
>>>>> wrote:
>>>>> >         Hi Oliver,
>>>>> >
>>>>> >
>>>>> >         What you are doing is very dangerous!  You can present the
>>>>> >         LUNs on the 2 servers, but only *one* can only write to it.
>>>>> >
>>>>> >
>>>>> >         If you want to achieve redundancy on your server, I believe
>>>>> it
>>>>> >         is better to get the HP Service Guard (but this is not a free
>>>>> >         software).
>>>>> >
>>>>> >
>>>>> >         http://docs.hp.com/en/ha.html
>>>>> >
>>>>> >
>>>>> >         HTH
>>>>> >
>>>>> >
>>>>> >         Jimmy
>>>>> >
>>>>> >
>>>>> >         On Tue, Dec 7, 2010 at 1:34 AM, Linux Cook
>>>>> >         <linuxc...@gmail.com> wrote:
>>>>> >
>>>>> >
>>>>> >                 Hi pluggers,
>>>>> >
>>>>> >                 I've just configured multipathing on my debian boxes
>>>>> >                 (Server A and Server B) using HP StorageWorks with
>>>>> >                 Dual FCs on each server and can now mount the path
>>>>> >                 alias I defined on my multipath configuration. But
>>>>> >                 everytime I write a data on Server A, the data are
>>>>> not
>>>>> >                 reflecting on Server B.
>>>>> >
>>>>> >                 Any help?
>>>>> >
>>>>> >                 Oliver
>>>>>
>>>>>
>>>>> _________________________________________________
>>>>>
>>>>
>> Hi Oliver,
>>
>> I'm confused, would you care to enlighten? Why are you trying to
>> accomplish in the first place? I'm assuming you're setting up an HA cluster
>> hence the need for shared disk and multipath ...., correct? If this is what
>> you're trying to achieve then you're doing it all wrong, the partition
>> should only be mounted on one server e.g. Server A, it will only be mounted
>> on  Server B if something happens to Server A e.g. hardware failure. The
>> shared drive should not be mounted on both machines at the same time or all
>> hell will break loose.
>>
>> Mounting will be done by your cluster manager e.g. Heartbeat or Redhat
>> cluster manager.
>>
>> BTW, you should be fine with either OCFS2 or GFS2 as filesystem.
>>
>> HTH.
>>
>> Jan
>>
>
>
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