>>> chandan jain <chandandevops@gmail.com> schrieb am 10.03.2021 um 09:46 in
Nachricht
<CAMojrsUnrA_LYH0tHqCZoCTezu8mXPCys=VHEEHtbOvRwawhbg@mail.gmail.com>:
> Thanks Ulrich, but Won't MMR behind a loadbalancer  cause data
> inconsistentcy if  I allow writes to both nodes. As per openldap
> documentation, mirror mode is not a multi provider solution , as writes go
> to just one of the mirror at a time in a 2 node setup.

That's correct, but the replication starts practically immediately, so usually the data is up-to-date within a second if the other side is ready and reachable. After all LDAP was never designed to be a real-time database.

>
> I am confused which one shall I use,  N node mirror mode setup behind a
> load balancer as suggested by Quanah (write to one provider and read with
> other mirror pool members) or N nodes with multi provider setup spreading
> writes to both nodes.

A load-balancer that is not doing round-robin (but some other policy, like response time or throughput) probably would be OK.

Regards,
Ulrich

>
> Regards
> Chandan
>
> On Wed, Mar 10, 2021, 13:29 Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
> wrote:
>
>> >>> chandan jain <chandandevops@gmail.com> schrieb am 09.03.2021 um 10:58
>> in
>> Nachricht
>> <CAMojrsXkoHnv0fp_gWOeEADnzdXELiq3AjR-w0pJjGft5KBU5A@mail.gmail.com>:
>> > Thanks,
>> >
>> > Mirror mode configuration cannot be horizontal scaled what I understood
>> as
>> > writes are going to one of the node, and other act as an active standby.
>> >
>> > I want 2 or more nodes behind a load balancer which can share read/write
>> > load. A kind of active active setup.
>>
>> I wonder: If you have a 2-node MMR setup fed through a loadbalancer for
>> writing, it there really a performance benefit over sending all updates to
>> one node that replicates the changes to the other?
>>
>> Regards,
>> Ulrich
>>
>> >
>> > Regards
>> > Chandan Jain
>> >
>> > On Mon, Mar 8, 2021, 23:44 Quanah Gibson-Mount <quanah@symas.com> wrote:
>> >
>> >>
>> >>
>> >> --On Sunday, March 7, 2021 8:39 PM +0530 chandan jain
>> >> <chandandevops@gmail.com> wrote:
>> >>
>> >> >
>> >> >
>> >> > Thanks, Quanah
>> >> >
>> >> >
>> >> > Is it possible to direct upgrade from 2.4.32 to latest version.
>> >>
>> >> If you (temporarily) stick with the same backend, and in this case, if
>> >> that
>> >> same backend is linked to the exact same version of BDB, yes.  I.e.,
>> >> compile the back-bdb/hdb backends against the same version of BDB,
>> >> upgrade,
>> >> and then migrate to back-mdb.
>> >>
>> >> > Also,  can we horizontal scale a 2 node mirror mode setup? I am
>> confused
>> >> > after seeing suggestions on different sites.
>> >>
>> >> I don't understand the question here.  Mirror mode is just a
>> configuration
>> >> of MMR with a load balancer in front.
>> >>
>> >> --Quanah
>> >>
>> >> --
>> >>
>> >> Quanah Gibson-Mount
>> >> Product Architect
>> >> Symas Corporation
>> >> Packaged, certified, and supported LDAP solutions powered by OpenLDAP:
>> >> <http://www.symas.com>
>> >>
>>
>>
>>
>>
>>