Re: Slow replication in mirrormode

[Quanah Gibson-Mount <quanah@zimbra.com>]

--On Thursday, October 29, 2009 5:02 PM +0100 Peter Mogensen <apm@mutex.dk> 
wrote:

> I've moved to new (FAST*) hardware and I was testing how long it took for
> a empty mirrormode server to catch up with the other one. (like after a
> complete failure of one of the nodes)
>
>
> I'm using a database where id2entry.bdb is ~6.6Gb. and it's taking
> surprisingly long time.
> After 18 hours it has gotten around 1/4 of the way.
>
> I'm wondering if I could speed it up by loading an LDIF backup on the
> empty server before I start it.


Yep.  This is the recommended method for large databases.

> Are there anything special I should take into account, like regarding
> entryCSN and options to slapdadd when I load the backup?

You should make sure and use the -q flag, and make sure you have a properly 
configured DB_CONFIG file that will hold the entire DB (not just the 
id2entry.bdb file size).  In addition, if you go over 8GB in size, you'll 
likely want to use a shared memory key instead of an on disk cache.

--Quanah

--

Quanah Gibson-Mount
Principal Software Engineer
Zimbra, Inc
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