[DRBD-user] active/active

Leandro Dardini ldardini at tiscali.it
Sun Nov 2 08:10:59 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.


Chris Zimmerman ha scritto:
> 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
>>>> :
>>>> : http://www.linbit.com
>>>>
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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.
>
>
> Chris
>
>   
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>   
Yes, I can confirm you can do it with drbd+gfs. About the limit, yes, 
drbd can work only with 2 machines. No more, no less.

Leandro



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