samba - Jul 2016 - Winbind process stuck at 100% after changing use_mmap to no

On Tue, Jul 05, 2016 at 10:12:31PM +0100, Alex Crow
wrote:
> I did not "put it" like anything. I just saw an problem in my
setup,
> read some documents on the samba wiki, followed some advice and saw some
> unexpected behaviour. Perhaps I imagined the wiki to be more moderated
> that it really is, so my trust was misplaced. I don't blame anyone, all
> I'm trying to do is solve a problem.
> 
> >
> > how should I put this?
> > MooseFS sounds like it isn't useful with CTDB, you have paid for
> > MooseFS, it doesn't work, so you are now blaming Samba. You need
to do
> > what Volker says and get MooseFS to work with mmap.
> 
> AFAIK I don't need to get it to work with mmap, just get MooseFS to fix
> the non-mmap I/O coherence as, as Volker says, mmap is only important
> for TDB files and we don't store those on MooseFS.
> 
> Again, no "blame" was ever implied. I saw Winbindd using 100% CPU
after
> changing the "use mmap" parameter to "no" and was
rather perplexed as to
> how that could happen. The first natural place to ask would be this
> list, no? I also don't recall using any accusatory or inflammatory
> language, just stating observations, posting logs and actually at one or
> two points saying I'm also talking to the MooesFS devs.
> 
> As a busy sysadmin I rely on a number of sources to design and set up
> infrastructure, and sometimes it's easy to get mislead. At no point
have
> I ever questioned the knowledge of people like Jeremy, Tridge, or
> Volker. I'm just dismayed as a professional at getting
"ROFLS" in a
> reply to what I feel are perfectly sensible questions stemming from a
> misguided source of documentation.
Sorry for that Alex. Rowland, please be nicer to professional
people just asking for help.

I'm just back from a weeks vacation and trying to catch up.

What is the current state of your problem Alex ? As I understand
it you are requesting the MooseFS developers fix the mmap/pwrite
coherence issues.

Is there anything else you need from Samba ? What issues are
outstanding for you ?

Cheers,

	Jeremy.

On 13/07/16 19:28, Jeremy Allison wrote:
> Sorry for that Alex. Rowland, please be nicer to professional
> people just asking for help.
>
> I'm just back from a weeks vacation and trying to catch up.
>
> What is the current state of your problem Alex ? As I understand
> it you are requesting the MooseFS developers fix the mmap/pwrite
> coherence issues.
>
> Is there anything else you need from Samba ? What issues are
> outstanding for you ?
>
> Cheers,
>
> 	Jeremy.
Hi Jeremy,

We are working through a couple of niggles, one of which is the 
inconsistent results from the ping_pong test, the other being the 
occasional odd permission issue when a file shows with the correct 
permissions on the FS but users are getting "Access Denied" errors. 
Simply "re-applying" the permissions seems to fix it, even though 
getfacl showed them correctly in the first place.

At the moment we're pretty happy with the Samba side of things. I did 
wonder if there was any help that you kind chaps might be able to give 
to the MooseFS guys if they need it (they've not asked yet but I've 
suggested they might be able to). Overall it's working well, and much 
better than when we tried to move Samba shares to GlusterFS (bad 
memories of that one, lots of small files were not a good match).

Many thanks for your message,

Alex
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On Thu, Jul 14, 2016 at 02:22:12PM +0100, Alex Crow
wrote:
> At the moment we're pretty happy with the Samba side of things. I
> did wonder if there was any help that you kind chaps might be able
> to give to the MooseFS guys if they need it (they've not asked yet
> but I've suggested they might be able to). Overall it's working
The main hint I would like to give to the MooseFS developers is to get
ping_pong -rw working. If you need any assistance in setting that up
and getting arguments on why this is important, let us know!

With best regards,

Volker