Technote talking about Linux kernel tuning recommendations:
A little old but I doubt the variables have changed any.
- John Nardello
Message
From: veritas-bu-bounces (AT) mailman (DOT) eng.auburn.edu
[mailto:veritas-bu-bounces (AT) mailman (DOT) eng.auburn.edu] Behalf Kathryn
Hemness
Sent: Monday, September 18, 2006 3:59 PM
To: veritas-bu (AT) mailman (DOT) 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 LT/LT 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
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=220
set shmsys:shminfo_shmseg=100
Any help is appreciated.
Veritas-bu maillist - Veritas-bu (AT) mailman (DOT) eng.auburn.edu
Veritas-bu maillist - Veritas-bu (AT) mailman (DOT) eng.auburn.edu

Greetings,

Thanks to all who respondedMost 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.

Tue, 19 Sep 2006, Nardello, John wrote:

Date: Tue, 19 Sep 2006 08:21:59 -0700
From: "Nardello, John" <john.nardello (AT) wamu (DOT) net>
To: Kathryn Hemness <kfhemness (AT) ucdavis (DOT) edu>,
veritas-bu (AT) mailman (DOT) eng.auburn.edu
Subject: RE: [Veritas-bu] Linux Shared Memory Configuration

Technote talking about Linux kernel tuning recommendations:

A little old but I doubt the variables have changed any.

- John Nardello

Message
From: veritas-bu-bounces (AT) mailman (DOT) eng.auburn.edu
[mailto:veritas-bu-bounces (AT) mailman (DOT) eng.auburn.edu] Behalf Kathryn
Hemness
Sent: Monday, September 18, 2006 3:59 PM
To: veritas-bu (AT) mailman (DOT) 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 LT/LT 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
set shmsys:shminfo_shmmin=1
set shmsys:shminfo_shmmni=220
set shmsys:shminfo_shmseg=100

Any help is appreciated.

Veritas-bu maillist - Veritas-bu (AT) mailman (DOT) eng.auburn.edu

Veritas-bu maillist - Veritas-bu (AT) mailman (DOT) eng.auburn.edu