Sponsored Content
Operating Systems AIX Network tuning parameters on AIX Post 302891930 by bakunin on Sunday 9th of March 2014 07:01:30 PM
Old 03-09-2014
There are several tuning parameters for the kernel/network stack. The commands to set and query these "tunables" in IBM speak are:

no
schedo
vmo
ioo

All these commands share the same syntax:
-a display the current settings (even the defaults)
-o set the respective parameter
-p make the change of the parameter permanent

The way by which the commands work is: there is a directory /etc/tunables in which two files reside: nextboot and lastboot. Every tuning parameter which is not default will be listed in one of these. lastboot only holds the current values and at boot time it is overwritten by a copy of nextboot. If you change a parameter for the current boot cycle the change will be reflected there. If you choose to make a change permanent it gets written into nextboot and will be made active with the next boot.

You can edit nextboot with any plain text editor, but it is not wise to edit lastboot. Use the commands instead because they will also make the changes you intend active by restarting the respective services/daemons/... .

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
 

10 More Discussions You Might Find Interesting

1. AIX

Disk tuning parameters

I swapped out 2 72 gb disk drives for 2 146 gb drives, both of which spin at 15k. Are there any I/O parameters I should modify or can modify to get the most out of the new disks? Thanks, Mike M. (1 Reply)
Discussion started by: gravy26
1 Replies

2. UNIX for Advanced & Expert Users

tuning kernel parameters

Can only root do this, or can other users too? if other users can, do they have to be given permission, and if so, is there a file or something that stores this? Thanks. (4 Replies)
Discussion started by: JamesByars
4 Replies

3. UNIX for Advanced & Expert Users

Tuning AIX IO

Hi I am trying to investigate a disk performance issue, and we are not seem to be hitting the right direction in our analysis. This is a FC disk running on USP1000 HDS system. The application is an IO intensive application, but our opinion is that it is not performing due to perceived disk... (1 Reply)
Discussion started by: theerthan
1 Replies

4. AIX

How to do Performance monitoring and tuning in AIX

How to do Performance monitoring and tuning in AIX. (2 Replies)
Discussion started by: AIXlearner
2 Replies

5. AIX

tuning network parameters : parameters not persist after reboot

Hello, On Aix 5.2, we changed the parameters tcp_keepinit, tcp_keepintvl and tcp_keepidle with the no command. tunrestore -R is present in inittab in the directory /etc/tunables we can clearly see the inclusion of parameters during reboot, including the file lastboot.log ... (0 Replies)
Discussion started by: dantares
0 Replies

6. AIX

AIX Tuning For DB2

Dear friends. can anybody suggest me what to be considered in order to achieve maximum performance of AIX on which DB2 will be installed Thanks is advance :) (1 Reply)
Discussion started by: Vit0_Corleone
1 Replies

7. AIX

Tuning AIX for oracle

Dears i want to have a clear view about this tuning parameters and what they related to FS or Oracle , and how to figure the percentage of them . maxperm% maxclient% v_pinshm = 1 lgpg_regions = 0 lpgp_size = 0 (3 Replies)
Discussion started by: thecobra151
3 Replies

8. AIX

New to AIX tcpip tuning

For some reason, my AIX 5.2 box has become slow in accepting telnet requests from others boxes. Windows, times out the connection, whereas, Unix it will wait for the AIX to display the login. I connect and it respawns back and says connected, but then sits and wait for what seems forever to get the... (5 Replies)
Discussion started by: mrmurdock
5 Replies

9. AIX

AIX 6.1 memory tuning

Greetings, i'm wondering if there is a way to determine minimum memory requirement for AIX kernel and OS functions? We use memdetails script from perfpmr package to see actual memory allocation, for example like this: ===========================================================================... (5 Replies)
Discussion started by: dzodzo
5 Replies

10. AIX

IBM AIX I/O Performance Tuning

I have a IBM Power9 server coupled with a NVMe StorWize V7000 GEN3 storage, doing some benchmarks and noticing that single thread I/O (80% Read / 20% Write, common OLTP I/O profile) seems slow. ./xdisk -R0 -r80 -b 8k -M 1 -f /usr1/testing -t60 -OD -V BS Proc AIO read% IO Flag IO/s ... (8 Replies)
Discussion started by: c3rb3rus
8 Replies
dbc_max_pct(5)							     OBSOLETED							    dbc_max_pct(5)

NAME
dbc_max_pct, dbc_min_pct, bufcache_max_pct, bufpages, nbuf - OBSOLETED kernel tunable parameter DESCRIPTION
These tunables have been obsoleted and removed. Do not make any changes to these tunables, as they have no effect on the kernel. Use the file cache tunables and (see filecache_max(5)). In previous releases, the tunables and were used to set limits to the dynamic buffer cache, and the tunables and were used for tuning the buffer cache when a static cache was desired. This release of HP-UX offers improved file caching technology and improved physical memory control associated to caching file I/O data. The number of tunable parameters used to control file caching memory usage is reduced from five to two, and previous usability issues are addressed. Restrictions on Changing These tunables should not be modified. Attempting to tune any of the obsolete buffer cache tunables, or results in an error. Use the tunables and to set limits on the file cache. Note that, on a any given system, the optimum values of these two new tunables are not necessarily equivalent to the optimum values of the obsolete buffer cache tunable values in the older systems. You should first deter- mine if the new default values yield acceptable performance on your system, before attempting to change the values of the new file cache tunables. AUTHOR
and were developed by HP. SEE ALSO
filecache_max(5). Kernel Tunable Parameter dbc_max_pct(5)
All times are GMT -4. The time now is 01:59 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy