Your max shared memory "shmmax" value should be at minimum:
NUMBER_DATA_BUFFERS x SIZE_DATA_BUFFERS x "number of tape drives" x "max
multiplex"
I don't have the doc readily available to cite, but in essence,
If you have late model drives that are using a 256k buffer, and you have
4 connected drives, and you multiplex 4 streams per drive, and have 64
buffers configured, then you should have a shmmax of:
262144 x 64 x 4 x 4 = 268435456
Paul
--
> -----Original Message-----
> From: veritas-bu-bounces at mailman.eng.auburn.edu
> [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf
> Of Kathryn Hemness
> Sent: September 19, 2006 2:10 PM
> To: Nardello, John
> Cc: veritas-bu at mailman.eng.auburn.edu
> Subject: Re: [Veritas-bu] Linux Shared Memory Configuration
>
>
> Greetings,
>
> Thanks to all who responded....Most of the suggestions were helpful.
>
> This is a good technote and I'm going to try adjusting my values.
> Regarding bob944's comments, my Linux media servers ARE running
> with default kernel parameters and I'm seeing shared memory errors.
> The files in the /usr/openv/netbackup/db/config were recommended
> for both Solaris and Linux. It is for these reasons that I posted
> my query.
>
> I'm posting my current values for the parameters and indicating
> the recommended minimal settings in parenthesis:
>
> kernel.msgmnb = 16384 (65536)
> kernel.msgmni = 16 (256)
> kernel.msgmax = 8192 (8192)
>
>
> kernel.shmmni = 4096 (1024)
> kernel.shmall = 2097152 (nothing indicated in document)
> kernel.shmmax = 33554432 (16777216) - my value is already
> larger, so I'm keeping it.
>
>
> kernel.sem = 250 32000 32 128
> (300 1024 32 1024)
> semmsl, semmns, semopm, semmni)
>
> My Linux servers have 4GB of memory so I can always make
> upward adjustments.
>
>
>
> On Tue, 19 Sep 2006, Nardello, John wrote:
>
> > Date: Tue, 19 Sep 2006 08:21:59 -0700
> > From: "Nardello, John" <john.nardello at wamu.net>
> > To: Kathryn Hemness <kfhemness at ucdavis.edu>,
> > veritas-bu at mailman.eng.auburn.edu
> > Subject: RE: [Veritas-bu] Linux Shared Memory Configuration
> >
> > Technote talking about Linux kernel tuning recommendations:
> > http://support.veritas.com/docs/263755
> >
> > A little old but I doubt the variables have changed any.
> >
> > - John Nardello
> >
> > -----Original Message-----
> > From: veritas-bu-bounces at mailman.eng.auburn.edu
> > [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On
> Behalf Of Kathryn
> > Hemness
> > Sent: Monday, September 18, 2006 3:59 PM
> > To: veritas-bu at mailman.eng.auburn.edu
> > Subject: [Veritas-bu] Linux Shared Memory Configuration
> >
> > Greetings,
> >
> > My backup enterprise currently consists of a Solaris 9 Sun
> V240 master
> > and 3 Sun X4200 RHEL3 Linux Media Servers running NB51MP5.
> >
> > I've been getting the following messages for backups and
> duplications
> > to storage units on my Linux media servers:
> >
> > "problems encountered during setup of shared memory (89)"
> >
> > I use disk storage units and a mixed LTO2/LTO3 library.
> >
> > I've attempted to setup my Linux media servers similar to
> my Solaris 9
> > master by using the same NUMBER/SIZE_DATA_BUFFERS files in
> > /usr/openv/netbackup/db/config. But on my Solaris 9 master, I also
> > had /etc/system settings for msgsys, semsys, and shmsys values.
> >
> > I haven't been able to find anything about needing similar
> > /etc/system tuning on Linux (I believe the /etc/system
> equivalents are
> > set
> > via the /etc/sysctl.conf file).
> >
> > I'm hoping someone can tell me if all of the /etc/system
> parameters can
> > be set with sysctl on Linux and if their names are the
> same. Here are
> > my
> > current Solaris /etc/system parameters:
> >
> > set msgsys:msginfo_msgmap=512
> > set msgsys:msginfo_msgmax=8192
> > set msgsys:msginfo_msgmnb=65536
> > set msgsys:msginfo_msgmni=256
> > set msgsys:msginfo_msgssz=16
> > set msgsys:msginfo_msgtql=512
> > set msgsys:msginfo_msgseg=8192
> >
> > set semsys:seminfo_semmap=64
> > set semsys:seminfo_semmni=1024
> > set semsys:seminfo_semmns=1024
> > set semsys:seminfo_semmnu=1024
> > set semsys:seminfo_semmsl=300
> > set semsys:seminfo_semopm=32
> > set semsys:seminfo_semume=64
> >
> > set shmsys:shminfo_shmmax=536870912
> > set shmsys:shminfo_shmmin=1
> > set shmsys:shminfo_shmmni=220
> > set shmsys:shminfo_shmseg=100
> >
> > Any help is appreciated.
> > --Kathy
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu at mailman.eng.auburn.edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
>
>
> --Kathy
>
> _______________________________________________
> Veritas-bu maillist - Veritas-bu at mailman.eng.auburn.edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
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