[DRBD-user] active/active

Chris Zimmerman zimmermanc at chartermi.net
Sat Nov 1 16:49:51 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Wed, Oct 29, 2008 at 7:19 PM, Chris Zimmerman <fud.theturtle at gmail.com>wrote:

> On Wed, Oct 29, 2008 at 7:17 PM, Chris Zimmerman <fud.theturtle at gmail.com>wrote:
>> On Mon, Oct 27, 2008 at 8:56 PM, Kavan Smith <kavan at linbit.com> wrote:
>>> Hi Chris,
>>> > I'm looking into load balancing Xen instances and I really don't want a
>>> > shared san. I'm not really sure if drbd is something that would be
>>> > useful. From what I can gather, drbd only works active/active with
>>> > shared storage? Otherwise one xen instance would need to be passive?
>>> > I'm just looking for a method for the two instances to synchronize
>>> their
>>> > storage as I said I'm not sure if drbd is what I'm looking for.  Any
>>> > thoughts/suggestions?
>>> DRBD can accomplish the data replication in active/active mode utilizing
>>> GFS/OCFS with ease.  Read up on DRBD and GFS:
>>> http://www.drbd.org/users-guide/ch-gfs.html
>>> If I understand you correctly...
>>> I suppose a simple way to accomplish this would be to replicate your Xen
>>> DOMU to your secondary node with a slightly different configuration
>>> (ip/hostname/etc.) and utilize the shared storage for user data on both
>>> nodes.  This of course would not keep your secondary DOMU's operating
>>> system in sync with the primary.
>>> Take a look at csync2 to help keep your configuration files up to date
>>> on your Xen DOMU's.
>>> http://oss.linbit.com/csync2/
>>> I'm unclear as to how many physical machines you wish to run this on.
>>> Are you looking to accomplish this task on a total of 2 boxes?
>>> Cheers,
>>> -Kavan
>>> --
>>> : Kavan Smith
>>> : LINBIT USA, LLC | Your Way to High Availability
>>> : Telephone: 1-877-4-LINBIT / 1-877-454-6248
>>> :
>>> : 8152 SW Hall Blvd., Suite #209
>>> : Beaverton, OR 97008
>>> :
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Yes I want to use the shared storage for  public_html for a load balanced
Apache install.  You say shared storage, I want to sure, this can be done
with partitions on 2 machine's using drbd and gfs without the need for a
"shared storage" ?  I am trying to do this without a san if I can.
Does drbd have a limit of 2 servers?
Sorry I sent you this directly on accident Kavan.

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