I am doing Capacity Planning for Solaris. What is the guide line to add real memory for Solaris 9 environment.? What is the recommended tools to collect performance data such as vmstat and sar? Any comment is appreciated.
Thanks in Advance
cpc2004
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you can setup "sar" -- system activity reporter to collect some data about your box.
You can put something like the following in the crontab:
5,35 * * * * /usr/lib/sa/sa1 >/dev/null 2>&1
use need to login as root or su as root, then type in:
EDITOR=vi
export EDITOR
ccrontab -e
in vi mode, add
5,35 * * * * /usr/lib/sa/sa1 >/dev/null 2>&1
save and exit from vi
man crontab
man sar
to learn more details.
also have a look at "How to set up sar":
http://www.sarcheck.com/sa
man sar
to learn more details.
please have a look at:
"Memory and swapping":
http://www.princeton.edu/~
"sar":
http://www.princeton.edu/~
>>Most of our Solaris Server is V240 with 8GB real memory.
the V240 can have 8 GB RAM maximum !
If your system is doing a lot of swap, you need to upgrade to better servers.
In most case, your boxes should be ok, it depends on what's running on the boxes.
Paging rate - Number of pages read to physical memory or written to pagefile(s), per second.
Page-in rate - Number of pages read to physical memory, per second.
Page-out rate - Number of pages written to pagefile(s) and removed from physical memory, per second
Please have a look at this "Understand Solaris Filesystems & Paging":
http://research.sun.com/te
http://www.oreilly.com/cat
"Solaris memory troubleshooting and Tuning"
http://www.sunhelpdesk.com
and
"Solaris 8 Memory Architecture"
http://developers.sun.com/
http://sysunconfig.net/uni
http://www.onlamp.com/pub/
Paging in/out is normal on a Solaris system. If you edit a file in vi, you'll get page ins. When you write the file, you'll get page outs. Its just how things work.
If you are worried about virtual memory you should be worried about the scan rate (sr column in vmstat) and the SO/SI (pages swapped outs / pages swapped ins) columns in "vmstat -s". SO/SI should always be 0. You don't want to swap - well, you shouldn't want to swap.
Hi Nukfror,
In our installation we have a lot of unix servers, I want to set up a rule to determine whether the server requires additional memory. If paging rate or the value of SR is low , it is no need to add new ram. Do you any recommendation what is the threshold value of the paging rate and SR? I have the performance guideline which was 5 years old and the paging-out rate is 200 pages/sec and we have to add new ram. As you know, the I/O of the hard disk is much faster than 5 years old. I want to know the new paging rate for Solaris V240 and V480.
>What is the procedure to re-split the points?
Please read the instruction in the following page to learn how
to split the points:
http://www.experts-exchang
I'll re-open this question so that you can split the points.
Have a nice weekend to all of you, cheers!
yuzh
Business Accounts
Answer for Membership
by: yuzhPosted on 2006-01-16 at 17:46:17ID: 15716295
When you system use swap a lot, you need to add more RAM to get better
performance.
when the system has heavy load run:
swap -l
man swap.
Have a look at this Solaris performance FAQ:
http://www.itworld.com/Com
Some commandline tools:
http:Q_20906790.html#10513
If you need more help, please post more details about your hardward and applications. eg, what type of Sun box it is and what applications are running
on the box.