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Re: Textual LDIF backup strategies for busy LDAP clusters

Dear Quanah,

On 29/06/10 08:51 -0700, Quanah Gibson-Mount wrote:
--On Monday, June 28, 2010 11:42 AM +1000 Nick Urbanik <nick.urbanik@optusnet.com.au> wrote: 
On 25/06/10 10:41 -0700, Quanah Gibson-Mount wrote:

--On Friday, June 25, 2010 9:58 AM +1000 Nick Urbanik
<nick.urbanik@optusnet.com.au> wrote:

On 23/06/10 21:46 -0700, Quanah Gibson-Mount wrote:



Please can you explain why this is so?


Auditlog is a poorly written overlay that hopefully will be deleted
in the future.  It kills perf, and in general is not recommended
for use. If you want a record of changes, I suggest you look at the
accesslog overlay.


1. Can we use an LDIF backend with the auditlog overlay?


Why are you stuck on auditlog?  As I said, don't use it.


Sorry, I was too tired; I mean: "1. Can we use an LDIF backend with
the accesslog overlay?" 
2. Has anyone written a program to convert the auditlog data to an
   LDIF format that can be applied with ldapmodify?


No idea.  As I said, it's not really a usable piece of software.


Similarly, I meant:
"2. Has anyone written a program to convert the accesslog data to an
    LDIF format that can be applied with ldapmodify?"



One of the advantages of syncrepl (Although I use and prefer
delta-syncrepl, since syncrepl has not proven reliable in my
experience)


We are avoiding delta-syncrepl because, for reliability, we want to
use mirror-mode, and at
http://www.openldap.org/doc/admin24/replication.html#MirrorMode%20replication
under section 18.2.3.2. Arguments against MirrorMode is written:

"Delta-Syncrepl is not yet supported"

3. Does this mean that we are aiming for a less reliable replication
  with syncrepl that with delta-syncrepl?


You can still enable the accesslog overlay regardless of what
replication mechanism is used between the mirrors.


Yes, I understand that.


As for the reliability, as I said, in my experience, delta-syncrepl
has been reliable.


But has plain syncrepl been unreliable?  If so, in what way?


4. Is there any prospect of delta-syncrepl being supported with
   mirror-mode?


Yes, that's a future request.


Would you suggest we avoid using mirror mode so that we can use
delta-syncrepl in order to achieve more reliable replication?
--
Nick Urbanik http://nicku.org 808-71011 nick.urbanik@optusnet.com.au
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I disclaim, therefore I am.