samba - Aug 2018 - ldbsearch performance and tuning...

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.

> > 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?

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


Thanks.

-- 
dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
  Associazione ``La Nostra Famiglia''         
http://www.lanostrafamiglia.it/
  Polo FVG   -   Via della Bontà, 7 - 33078   -   San Vito al Tagliamento (PN)
  marco.gaiarin(at)lanostrafamiglia.it   t +39-0434-842711   f +39-0434-842797

		Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
      http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000
	(cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)

On Wed, 29 Aug 2018 10:39:20 +0200
Marco Gaiarin via samba <samba at lists.samba.org> 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

Mandi! Rowland Penny via samba
  In chel di` si favelave...
> > But accessing LDAP data via network (eg, from a DM to a DC), the use
> > of '--paged' will gain some performance increase?
> No
OK. Thanks.

-- 
dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
  Associazione ``La Nostra Famiglia''         
http://www.lanostrafamiglia.it/
  Polo FVG   -   Via della Bontà, 7 - 33078   -   San Vito al Tagliamento (PN)
  marco.gaiarin(at)lanostrafamiglia.it   t +39-0434-842711   f +39-0434-842797

		Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
      http://www.lanostrafamiglia.it/index.php/it/sostienici/5x1000
	(cf 00307430132, categoria ONLUS oppure RICERCA SANITARIA)