[Samba] winbind causing huge timeouts/delays since 4.8

Ralph Böhme slow at samba.org
Tue Feb 26 14:18:35 UTC 2019

On Tue, Feb 26, 2019 at 01:32:51PM +0000, Rowland Penny wrote:
>On Tue, 26 Feb 2019 12:49:42 +0100 Ralph Böhme  wrote:
>> On Tue, Feb 26, 2019 at 12:45:45PM +0100, Björn JACKE via samba wrote:
>> >To reflect the fact that the owner can be a group also, winbind
>> >can assign both a mapped uid number and a gid number for Windows
>> >users and groups, both uid and gid have the same value and are the
>> >xid. That way Samba can also assign the ownership of files to a
>> >group. The idmap backend has to be able to support XID though, not
>> >all idmap backends do so.
>> in particular idmap_autorid, idmap_rid and idmap_script support this
>> so called mode, idmap_ad doesn't.
>I take it that xid is used internally by Samba to identify calculated
>ID's, because the only place a normal user will come across them is in
>idmap.ldb. If this is correct, then it doesn't really matter that
>idmap_ad doesn't support them, because uidNumber & gidNumber replaces

Iirc it matters: I guess SID history will not work with idmap_ad.

>From a users point of view, the only way to get an experience similar
>to Windows is to use idmap_ad.

From a certain perspective: maybe. But that's a generalisation, I wouldn't go 
over that bridge.

Again: for many fileserver scenarios you're better using idmap_autorid.


Ralph Boehme, Samba Team                https://samba.org/
Samba Developer, SerNet GmbH   https://sernet.de/en/samba/
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