/etc/sysctl.conf is the correct file.

You can learn more about it by reading the man page for it and also the
one for sysctl.

The available parameters are in /proc/sys/kernel.  You can cat each of
these to see current value (assuming they are using defaults not shown
in sysctl.conf).

There are shm and sem parameters (e.g. shmmax) but they are not exactly
the same.  You should focus on the shm parameters given the message
you're seeing.

Note:  RHEL 3 is 32 bit.  You can only set shmmax to 4 GB - 1 byte at
most.  (4 GB is maximum but if you set it to that it actually goes back
to 0 so you have to subtract the 1 byte).  Even with that the best
you'll get is 1.6 GB without doing some extra magic.   

Unfortunately since the fibre on Linux didn't understand our fibre
bridges we never set up Linux as a media server so I can't tell you what
the settings should be.  Just wanted to offer the confirmation you asked
for about sysctl.conf and a little more info.

-----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 6:59 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
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