Web lists-archives.com

Re: [Samba] ldbsearch performance and tuning...




On Wed, 29 Aug 2018 10:39:20 +0200
Marco Gaiarin via samba <samba@xxxxxxxxxxxxxxx> wrote:

> Mandi! Andrew Bartlett via samba
>   In chel di` si favelave...
> 
> > > I'm still on samba4.5, sorry me.
> > Fix that first.
> 
> Eh... i hope on this year.

>From that, it looks like you mean later this year, I would update as
soon as 4.9.0 comes out.

> 
> 
> > > I've done some (bash) scripting around ldbsearch, but i've found
> > > some performance and 'lock' trouble.
> > Correct, Samba before 4.7 has very poor unindexed search
> > performance, due to a bug. 
> 
> OK.
> 
> > > a) query seems 'slow'. If i user paged result (--paged) coud
> > > achive better performance? It is a 'network' optimization only,
> > > right? eg: ldbsearch --paged -H /var/lib/samba/private/sam.ldb ...
> > >  is totally unuseful, right?
> > Correct, this would just increase the load.
> 
> But accessing LDAP data via network (eg, from a DM to a DC), the use
> of '--paged' will gain some performance increase?
>

No
 
> 
> > > b) in a domain member (so, network queries) i've found some
> > > 'ldbsearch'
> > >  processes stalled. I was forced to kill them.
> > > There's some way to prevent that? Eg, via '--socket-options=' or
> > > '--controls=' options?
> > I would need more information on that.  Fixing the server to run a
> > current Samba would likely fix that.
> 
> AFAI've understood, ldbsearch processes stalled sometimes when i'm
> doing 'primary' DC (ok, Rowland, the DC with FSMO roles ;-) backup
> with Louis script.

I think you mean the DC with the PDC emulator role ;-)

> 
> I do the backup only on the DC with FSMO roles, and only the DM that
> 'hit' that DC seems have ldbsearch processes stalled.

When 4.9.0 comes out, you will be able to use the new samba-tool backup
command and equally importantly, the restore command.

Rowland


-- 
To unsubscribe from this list go to the following URL and read the
instructions:  https://lists.samba.org/mailman/options/samba