There are two things i noticed which might affect performance negatively:
Quote:
Originally Posted by c3rb3rus
You can increase this to help especially larger transfers. Use the -R switch of lsattr to see legal values you can use.
These two:
Quote:
Originally Posted by c3rb3rus
are also not optimal. Basically the multipath drivers (can) use multiple pathes (FC connections from the LUN to the system) at once. These multiple pathes can be used for two purposes: the first is redundancy, so that if one connection fails it uses another. Connection failure - temporarily - happens rather frequently for reasons i don't fully understand in FC-connections. The other purpose multiple pathes can be used to is performance: using several pathes in parallel speeds things up. This is basically controlled by using the "algorithm" property. I have no test system at hand to tell you the value you need to use but there are only two of them and you need the other one - again, use the lsattr -R switch to list all legal values for the property.
The reserve_policy should be "no_reserve" but this matters mostly in clusters where disks are accessed from several systems at once.
can someone tell me a good site to go to in order to learn this. please do not recommen nay books because i dont have interest in that. if you know of any good sites with good straight forward explanation on how to split loads on machines that has excessive loading, please let me know
Also,... (1 Reply)
Hi all,
long time ago I posted something, but now, it is needed again :(
Currently, I am handling with a big NFS Server for more than 200 clients, this sever has to work with 256 NFSDs. Because of this huge amount of NFSDs, there are thousands of small write accesses down to the disk and... (3 Replies)
Hi to all,
I'm interested in finding an introduction about Performance Tuning under Unix (or Linux); can somebody please point me in the right direction?
Best regards (1 Reply)
Sorry,
This is out of scope of this group.But I require the clarification pretty urgently.
My Oracle database is parallely enabled.
Still,in a particular table queries do not work "parallely" always.
How is this? (9 Replies)
Hi All,
In last one week, i have posted many questions in this portal. At last i am succeeded to make my 1st unix script.
following are 2 points where my script is taking tooooo long.
1. Print the total number of records excluding header & footer. I have found that awk 'END{print NR -... (2 Replies)
Hi all,
From Googling, I found that the basics used for troubleshooting UNIX/AIX performance issues are commands like vmstat, iostat and sar. I believe these are generic commands regardless of what UNIX flavour is in used, only difference being is the format of the output.
In a real case... (2 Replies)
Please take a look at this system and give your analysis / advice. Can it be tuned to get a better performance?
We are not getting more hardware ressources at the moment.
We have to live with what we have. Application running on the system is SAS. OS is AIX 6.1
Let me know if you need output of... (7 Replies)
Dear all,
I have a Local zone , where users feel that performance is not good.
Is it wise to collect the inputs from the local zone rather than taking from the global zone.
And also Can I tune from Global zone , so that it will reflect in local zone.
Rgds
rj (2 Replies)
Overview:
Introduction
What Does Success Mean?
What Does Performance Mean?
Every Picture is Worth a Thousand Words
Work Like a Physicist
Work Like You Walk - One Step at a Time
Learn to Know Your System
Choose Your Weapons!
Tools of the Trade 1 - vmstat
A Little Theory Along the Way -... (1 Reply)
Discussion started by: bakunin
1 Replies
LEARN ABOUT HPUX
loratune
loratune(1M)loratune(1M)NAME
loratune - initiate LORA tuneup to improve alignment of processing resources
SYNOPSIS DESCRIPTION
The command improves the performance of an HP-UX system in LORA (Locality-Optimizated Resource Alignment) mode, by triggering the kernel to
do optimization tuning of the system and application memory.
The command may return before the tuning is complete. This tuning can continue in the background for several minutes after the command
returns. If the command is interrupted, or the command process is otherwise terminated, no subsequent tuning operations will be initiated,
but those in progress will continue until completion.
When no options are specified, all locality domains are tuned.
Options
This option limits the tuning to the locality domain specified by
lid.
Application Usage
In Locality-Optimized Resource Alignment (LORA) mode, performance of applications may improve when their processors and the memory that
they use are aligned in the same locality. The HP-UX kernel attempts to maintain such alignment at all times, but it is possible for mis-
alignment to occur when the system workload transitions significantly. If that happens, the command can be used to reestablish alignment
and improve application performance.
Here are some examples of workload transition events that may cause misalignment of processing resources:
o Starting or terminating an application that consumes a large amount of processor or memory resources.
o The workload demand surges far above the normal level and then recedes.
o Dynamic platform operations that add or subtract processor or memory resources from the operating system's control.
If one of those events has occurred, and application performance is not as high as it can be, then it is appropriate to invoke the command.
RETURN VALUES
The command returns a 0 when successful, and a non-zero value when unsuccessful.
ERRORS
The command will not initiate any tuning and will return a non-zero value if the user does not have appropriate privilege.
WARNINGS
The command can consume a significant amount of system processing resources to restore optimal alignment. Ideally, the command should be
invoked prior to the time when performance is critical, not during the time when performance is critical. The command should be invoked
after the workload transition is complete, not during workload transition. Although tuning can continue in the background for several min-
utes, it is not necessary to wait any more than five minutes between invoking the command and launching new applications.
EXAMPLES
If eight instances of SAP were running in localities with locality domain identifiers 4 and 5, and four of those instances were shut down,
then it would be appropriate to tuneup the remaining four instances. An example command would be:
If an HP-UX system in LORA mode had one of its cells deactivated, then it would be appropriate to tuneup the entire system. An example
command would be:
AUTHOR
was developed by HP.
SEE ALSO mpsched(1), numa_policy(5), lora(7).
Itanium(R)-based Systems Only loratune(1M)