Operating Systems

Additional Windows System Configurations

AIX

Use the following commands to set the SAS recommended TCP/IP settings:

/usr/sbin/no -o tcp_timewait =1 
/usr/sbin/no -o tcp_keepidle=600 
/usr/sbin/no -o tcp_keepintvl=10 
/usr/sbin/no -o tcp_keepinit=40

In some environments, the maximum number of user processes might need to be increased, particularly on the system running the SAS Web Infrastructure Platform Data Server when the max_connections value is increased. The default value is 128.

To increase the max_connections value, run the following command:

chdev -l sys0 -a maxuproc=new_value

A new value of 1024 or 2048 (or higher) might be appropriate, depending on how many processes and connections are configured.

HP-UX

Use the following commands to set the SAS recommended TCP/IP settings:

ndd -set /dev/tcp tcp_conn_request_max 8192 
ndd -set /dev/tcp tcp_keepalive_interval 7200000 
ndd -set /dev/tcp tcp_keepalives_kill 1

In addition, SAS recommends tuning the following kernel parameters by using the SAM utility or the kctune utility.

Recommended Kernel Parameters to Tune
Kernel Parameter	Recommended Value
swchunk	8192
shmseg	512
maxdsiz	3221225472
maxdsiz_64bit	64424509440
maxfiles_lim	10000 Note: Change this value before changing maxfiles.
maxfiles	8192
semume	512
semmsl	3072
msgssz	512 Note: Change this value before changing msgmax.
nkthread	10000
nproc	10240 Note: Change this value before changing maxuprc.
maxuprc	4096
nflocks	11585
ninode	8110
msgmap	13109
msgseg	32767 Note: Change this value before changing msgmax.
msgmnb	65535 (0x10000) Note: Change this value before changing msgmax.
msgmnb	131070 Note: Set when running multiple JVMs on the same system.
msgmax	65535 (0x10000)
msgmax	131070 Note: Set when running multiple JVMs on the same system.
msgmni	4634
semmns	11586
semmni	8192
semmnu	8180
shmmax	1.85514E+11
shmmni	8192
STRMSGSZ	65535
dbc_max_pc	10
nstrpty	60
cmc_plat_poll	15
msgtql	13107

Linux

Use the following commands to temporarily set the SAS recommended TCP/IP settings:

echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout  
echo 3000 > /proc/sys/net/core/netdev_max_backlog 
echo 3000 > /proc/sys/net/core/somaxconn 
echo 15 > /proc/sys/net/ipv4/tcp_keepalive_intvl 
echo 5 > /proc/sys/net/ipv4/tcp_keepalive_probes

Note: These settings will be lost upon rebooting your system.

Use the following commands to permanently set the SAS recommended TCP/IP settings:

/sbin/sysctl -w net.ipv4.tcp_fin_timeout=30
/sbin/sysctl -w net.core.netdev_max_backlog=3000
/sbin/sysctl -w net.core.somaxconn=3000
/sbin/sysctl -w net.ipv4.tcp_keepalive_intvl=15
/sbin/sysctl -w net.ipv4.tcp_keepalive_probes=5

In addition, set the operation system limits by accessing the /etc/security/limits.conf file. Add or change the values, based on the following information:

Linux System Limits
Domain	Type	Item	Recommended Value
*	—	nproc	10240
*	—	stack	10240
*	—	nofile	20480

Some Linux distributions include additional settings in *.conf files in the /etc/security/limits.d directory. The values specified in the files in this directory override the limits specified in the limits.conf file. For example, some distributions set an explicit soft limit for the nproc ulimit value. This is specified in the /etc/security/limits.d/90-nproc.conf file. In this file, change the nproc value to correspond to the value specified in the preceding table.

Solaris SPARC and Solaris x86-64

Use the following commands to set the SAS recommended TCP/IP settings:

ndd -set /dev/tcp tcp_keepalive_interval 300000 
ndd -set /dev/tcp tcp_time_wait_interval 60000 
ndd -set /dev/tcp tcp_conn_req_max_q 256 
ndd -set /dev/tcp tcp_conn_req_max_q0 2500 
ndd -set /dev/tcp tcp_max_buf 4000000

Windows

The Windows registry must be updated. Microsoft recommends performing a system backup before editing the registry. To set the SAS recommended parameters, use the REGEDIT command as follows:

Access the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters registry subkey. Add the DWORD value with a name of TcpTimedWaitDelay and a value of 30 (0xle).

Access the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\AFD\Parameters registry subkey. Add the following DWORD values:

AFD Service Parameters
Name	Recommended Value
EnableDynamicBacklog	1 decimal
MinimumDynamicBacklog	20 decimal
MaximumDynamicBacklog	1000 decimal
DynamicBacklogGrowthDelta	10 decimal

The recommended values specify the number of connections that you want to be available. These values request a minimum of 20 and a maximum of 1000 available connections. The number of available connections is increased by 10 each time there are fewer than the minimum number of available connections.

In addition, the user port range should be updated. From a command prompt, run the following commands, based on the version of your Internet protocol:
```
netsh int ipvn set dynamicport tcp start=32768 num=32767
netsh int ipvn set dynamicport udp start=32768 num=32767
```
where n indicates the version of your Internet protocol and is either 4 or 6.
Restart Windows.

Additional Windows System Configurations

The following list includes general recommendations for configuring Windows systems:

Disable Windows indexing on any directories that are used by SAS software.
Set Windows performance settings so that background processes are favored.
Set the maximum power profile in the system BIOS for all systems, except Intel Sandy Bridge.
Disable the C1E BIOS setting on Dell systems.