Is it possbile to use MMR to my advantage to switch over? For example, take down 1 of the servers, switch the db config from bdb to mdb, and then restart with a blank database (with appropriate structure) and have the MMR take care of backfilling the mdb entries? Then I wouldn't have to export to ldif, convert the db, and reimport while possibly loosing data from the other systems.

On Thu, Nov 1, 2012 at 12:57 PM, Quanah Gibson-Mount quanah@zimbra.comwrote:

--On Thursday, November 01, 2012 12:36 PM -0400 Kyle Smith < alacer.cogitatus@gmail.com> wrote:

Ok, I have been running 2.4.32 for some time with no issues. Yesterday, 2

...

different servers (both part of a 4-way MMR) produced an "index add failure" and an "index delete failure". I went back over the bdb DB_CONFIG Settings (listed below) and everything looks nominal to me. Would it just make more sense to switch from bdb to mdb instead of troubleshooting these "random" errors too much? I also noticed that the number of "deadlocks" corresponds to the number of errors that were produced. Is there correlation there?

I would suggest back-mdb in OpenLDAP 2.4.33 over back-hdb, yes. It will remove these deadlock issues entirely. When you configure the back-mdb backend in cn=config, be sure to have:

olcDbEnvFlags: writemap olcDbEnvFlags: nometasync

set as well. This makes back-mdb writes significantly faster than writes to back-bdb/hdb. (Some 2x faster in my testing so far).

--Quanah

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Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc.

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