IDS Forum

Re: Mutex logs on logical log flip

Posted By: Fernando Nunes
Date: Monday, 29 February 2016, at 4:53 a.m.

In Response To: Re: Mutex logs on logical log flip (Fernando Nunes)

What I meant was "that nsf has nothing to do with NFS".

The first improvement tried was to increase the number of file descriptor
servers.... there's a parameter for that:

NUMFDSERVERS

But my understanding is that it was not very useful as more FDSERVERS could
cause even greater contetnion. Later the table where the file descriptors
are stored was split and that could effectively improve the situation. But
this later change was done only on 11.70. I believe NUMFDSERVERS was
introduced in some later fixpack of 11.50. A query on sysmaster:syscfgtab
may eliminate any doubts.

On Mon, Feb 29, 2016 at 12:54 AM, Fernando Nunes <domusonline@gmail.com>
wrote:

> "that" nsf has nothing to do with NSF. It's related to the sharing of file
> descriptors among different CPU VPs.... It's also a classical issue on
> large instances....
> Several improvements were made but I think they were put on 11.70+ only.
>
> I'm a bit puzzled by the relation with the log change. Typical situations
> ate related to high CPU usage and most frequent with a large number of new
> connections. There were cases of customers with ten's or even hundreds per
> second.
>
> I'd say the PMR is your best options. Support colleagues will find several
> cases.... eventually too many to be really useful.
>
> Newer versions would help. I also wonder if Solaris may be an increased
> "risk" factor...
> Your NETTYPE settings coul be interesting to see. And please check the
> number of new connections per second.... I belìeve I've also seen some
> interestin theory from Art regarding Sparc CPUs an their
> multi-threading....
>
> Regards
> On Feb 28, 2016 23:58, "Art Kagel" <art.kagel@gmail.com> wrote:
>
> > Consumate professional as always Neil. Just trying to get the dumb stuff
> > out of the way.
> >
> > Art
> > On Feb 28, 2016 8:55 PM, "NEIL TRUBY" <neil.truby@ardenta.com> wrote:
> >
> > > Log backups go to some sort of SAN-attached data domain device.
> > >
> > > Chunks on NFS!?! I'm not a bloody amateur! ;-). They're raw devices,
> > > fronted
> > > by Veritas Storage Foundation on an EMC VNX-2 SAN.
> > >
> > > cheers
> > > N
> > >
> > >
> > >
> > >
> >
> >
>
> *******************************************************************************
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> >
> > --001a113ff31865a552052cdd4cf3
> >
> >
> >
> >
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --089e01176343698942052cde1500
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Fernando Nunes
Portugal

http://informix-technology.blogspot.com
My email works... but I don't check it frequently...

--089e01184b0cd5f6f4052ce59cb6

Messages In This Thread

• Mutex logs on logical log flip
  NEIL TRUBY -- Sunday, 28 February 2016, at 6:28 p.m.
  • Re: Mutex logs on logical log flip
    Art Kagel -- Sunday, 28 February 2016, at 6:46 p.m.
    • Re: Mutex logs on logical log flip
      NEIL TRUBY -- Sunday, 28 February 2016, at 6:54 p.m.
      • Re: Mutex logs on logical log flip
        Art Kagel -- Sunday, 28 February 2016, at 6:57 p.m.
        • Re: Mutex logs on logical log flip *NM*
          NEIL TRUBY -- Sunday, 28 February 2016, at 7:12 p.m.
        • Re: Mutex logs on logical log flip
          Fernando Nunes -- Sunday, 28 February 2016, at 7:54 p.m.
          • Re: Mutex logs on logical log flip
            Madison Pruet -- Sunday, 28 February 2016, at 9:05 p.m.
          • Re: Mutex logs on logical log flip
            Fernando Nunes -- Monday, 29 February 2016, at 4:53 a.m.
          • Re: Mutex logs on logical log flip
            NEIL TRUBY -- Monday, 29 February 2016, at 12:35 p.m.
            • Re: Mutex logs on logical log flip
              Madison Pruet -- Monday, 29 February 2016, at 12:52 p.m.
              • Re: Mutex logs on logical log flip
                NEIL TRUBY -- Monday, 29 February 2016, at 1:09 p.m.
                • Re: Mutex logs on logical log flip
                  John Miller iii -- Monday, 29 February 2016, at 3:59 p.m.
                  • Re: Mutex logs on logical log flip
                    NEIL TRUBY -- Monday, 29 February 2016, at 7:41 p.m.
                    • Re: Mutex logs on logical log flip
                      Madison Pruet -- Monday, 29 February 2016, at 9:27 p.m.
                    • Re: Mutex logs on logical log flip
                      RICHARD KOFLER -- Tuesday, 1 March 2016, at 3:37 a.m.
                • Re: Mutex logs on logical log flip
                  Spokey Wheeler -- Tuesday, 1 March 2016, at 4:18 a.m.
            • Re: Mutex logs on logical log flip
              Fernando Nunes -- Monday, 29 February 2016, at 2:36 p.m.
              • Re: Mutex logs on logical log flip
                Art Kagel -- Monday, 29 February 2016, at 4:59 p.m.

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