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тАО02-27-2009 09:06 AM
тАО02-27-2009 09:06 AM
shmmax value is as follows:
kmtune -l -q shmmax
Parameter: shmmax
Value: 0XC0000000
Default: 0X4000000
Minimum: -
Module: -
Total VM : 1012mb Sys Mem : 244.7mb User Mem: 2.78gb Phys Mem: 4.00gb
Active VM: 257.9mb Buf Cache: 614.4mb Free Mem: 386.2mb
We are planning to upgrade the physical memory from 4 GB to 6 GB.
Do we need to increase the shmmax value and if yes to what value
What would be procedure for increasing it
many thanks in advance
Solved! Go to Solution.
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тАО02-27-2009 09:38 AM
тАО02-27-2009 09:38 AM
Re: shmmax value
>>We are planning to upgrade the physical memory from 4 GB to 6 GB.<<
Your swap space should be double the size of your Pshyical RAM
if total Pshyical RAM 6GB you need have totol swap space of 12GB
# swapinfo -tam (Can check current size of you swap)
>>Do we need to increase the shmmax value and if yes to what value<<<
NO NEED
what Application are you running.?
do you have any perfromance issue?
Please below Thread for more Inforamtion
http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1272448
Thanks,
Johnson
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тАО02-27-2009 09:40 AM
тАО02-27-2009 09:40 AM
Solution>memory from 4 GB to 6 GB.
>
>Do we need to increase the shmmax value and
>if yes to what value
The answe is it depends, but more than likely it will be to your benefit to increase this value.
Most java-heavy applications running on hpux (and what is not java-heavy nowadays) wants you to set shmmax value to value which is equal to the amount of physical memory. Right now, you are saying you have 4GB physical memory on the system but your shmmax is set to 3GB. If it is configured like this for a reason, you need to figure out why it is that way and adjust the value according to the requirements of the person/vendor who wanted it that way. This will help you avoid headaches down the road.
If you are running Oracle, SAP, or any other java written application, in the lack of finding out what shmmax value needs to be, it is a safe bet to set it to the amount of physical memory, which will be 6GB in your case. SO the command to modify it should be as follows:
kmtune -s shmmax=6442450944
ans it is a dynamically configurable parameter, not needing a reboot.
Hope this helps
UNIX because I majored in cryptology...
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тАО02-27-2009 10:42 AM
тАО02-27-2009 10:42 AM
Re: shmmax value
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тАО02-27-2009 04:56 PM
тАО02-27-2009 04:56 PM
Re: shmmax value
Defer to your applications kernel parameter requirements.
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тАО03-04-2009 07:00 AM
тАО03-04-2009 07:00 AM
Re: shmmax value
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тАО03-04-2009 07:06 AM
тАО03-04-2009 07:06 AM
Re: shmmax value
Changes to this tunable take effect immediately and does not need reboot.
Check this..
http://docs.hp.com/en/B2355-60127/shmmax.5.html
Ganesh.
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тАО03-04-2009 07:16 AM
тАО03-04-2009 07:16 AM
Re: shmmax value
Do you need to increase shmmax? No.
It might improve performance of applications like Oracle.
In this case I would do as follows:
sam
Kernel
Configurable parameters
Change shmmax
Compile kernel and boot via the menu.
Note: HP-UX 11.00 is out of support. I strongly urge a make_tape_recovery or make_net_recovery backup be done before any changes.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО03-04-2009 07:34 AM
тАО03-04-2009 07:34 AM
Re: shmmax value
Its not required to increase the value of shmmax after upgrade of memory but you can always increase it.
Its a Static value and requires reboot in 11.00
Regards
Sanjeev
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тАО03-04-2009 07:39 AM
тАО03-04-2009 07:39 AM
Re: shmmax value
As you mentioned hp-ux version is 11.00 and in this version shmmax is static
shmmax 3221225472 3221225472 Static N/A
but not in 11.23
so it will require reboot after changing the value
Regards
Sanjeev