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08-22-2011 03:30 AM
08-22-2011 03:30 AM
Changing shmmax kernel parameter
Hi Experts
:/root#model
ia64 hp server rx6600
:/root#uname -a
HP-UX B.11.31 U ia64 3200339551 unlimited-user license
:/root#kctune -v -q shmmax
Tunable shmmax
Description Maximum size of a shared memory segment (bytes)
Module vm_asi
Current Value 1073741824 [Default]
Value at Next Boot 1073741824 [Default]
Value at Last Boot 1073741824
Default Value 1073741824
Constraints shmmax >= 2048
shmmax <= 4398046511104
Can Change Immediately or at Next Boot
I need to change the shmmax parameter to 0x40000000000
I am confused to proceed
does #kcutne shmmax=0x40000000000 will change the desired paramter. Please suggest me whehter i am correct or not
- Tags:
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08-22-2011 05:06 AM
08-22-2011 05:06 AM
Re: Changing shmmax kernel parameter
@Indrajit Bhagat wrote:
I need to change the shmmax parameter to 0x40000000000
does #kcutne shmmax=0x40000000000 will change the desired paramter.
So, your really have some 4TB of memory on this server? While you might want to increase your 'shmmax' from the default, it is probably absurd to jump to the maximum.
This said, yes, 'kctune shmmax=<value>' will change the tunable immediately in this case as the output of your query shows.
Regards!
...JRF...
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08-22-2011 05:14 AM
08-22-2011 05:14 AM
Re: Changing shmmax kernel parameter
Hi:
/usr/sbin/kctune -C "Reason for Change" -B shmmax="0x40000000000"
rgs,
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08-22-2011 05:31 AM
08-22-2011 05:31 AM
Re: Changing shmmax kernel parameter
Hi James
Currently I am having Memory of 15.97 GB, and I hope there is some change schedule for increasing the memory, according to that , I need to check the exact memory after the change happened and according to that i need to change the kernel parameter
:/root#machinfo|more
CPU info:
4 Intel(R) Itanium 2 9000 series processors (1.59 GHz, 18 MB)
532 MT/s bus, CPU version C2
8 logical processors (2 per socket)
Memory: 16351 MB (15.97 GB)
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08-22-2011 07:46 AM
08-22-2011 07:46 AM
Re: Changing shmmax kernel parameter
Shalom,
You don't need to change the number to an exact format match. That figure you have can be translated into a number, which is the minimum shmmax figure in bytes you need for the application.
You might want to look at ipcs output and see how your current use is set up.
I assume you have an application that you are installing that has minimum requirements. The details on this application would be helpful in provideing further assistance.
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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08-22-2011 11:50 AM - edited 08-22-2011 10:23 PM
08-22-2011 11:50 AM - edited 08-22-2011 10:23 PM
Re: Changing shmmax kernel parameter
>you really have some 4TB of memory on this server? ... it is probably absurd to jump to the maximum.
Right. But she could have the just announced 32 socket Superdome 2 with 4 TB memory.
Perhaps something like 50% of your 16 Gb. And what is your filecache_max(5)?
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04-04-2013 10:27 PM
04-04-2013 10:27 PM
Re: Changing shmmax kernel parameter
Command
kctune shmmax=17179869184