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тАО07-03-2001 10:02 AM
тАО07-03-2001 10:02 AM
Good guidelines for selecting swap space?
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тАО07-03-2001 10:09 AM
тАО07-03-2001 10:09 AM
Re: Good guidelines for selecting swap space?
depends - how much memory do you have?
If you have a lot, then you probably want to investigate pseudo-swap (kernel parm) allows you to fool the system into thinking you have swap space for use, because if you have a lot of memory, then you shouldn't be swapping.
If you don't have a lot of memory, then you probably should go with the standard 2x memory.
tx,
C
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тАО07-03-2001 10:12 AM
тАО07-03-2001 10:12 AM
Re: Good guidelines for selecting swap space?
If you got a production server with heavy transactions, then swap space would be 3 or 4 times the physical memory.
have a look at :
Essential System Administration.
O'Reilly
By Aeleen Frisch
Second edition
Page 315 and up.
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тАО07-03-2001 10:12 AM
тАО07-03-2001 10:12 AM
Re: Good guidelines for selecting swap space?
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тАО07-03-2001 10:18 AM
тАО07-03-2001 10:18 AM
Re: Good guidelines for selecting swap space?
Thanks,
Dan
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тАО07-03-2001 10:22 AM
тАО07-03-2001 10:22 AM
Re: Good guidelines for selecting swap space?
When I upgrade to hp-ux 11.0, I did also a HW changes from K420 to L2000 class server.
I noticed that, for heavy oracle OLTP process, not enough space error messages are comming on all production systems ( 6 different production servers ).
The issue is, while some process is doing I/O, the schedular is putting them into swap and it try to electe other ones to fill into memory to be executed , but when there is a competition and the cpu speed is high then swap will not follow the semand for putting process lookuin for more I/Os. that's why by increasing the swap space by four times the physical mem, this problem had disappeared.
HTH.
Magdi
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тАО07-03-2001 10:26 AM
тАО07-03-2001 10:26 AM
Re: Good guidelines for selecting swap space?
You might start here ("Managing Swap and Dump"):
http://docs.hp.com/hpux/onlinedocs/B2355-90742/B2355-90742.html
...JRF...
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тАО07-03-2001 10:54 AM
тАО07-03-2001 10:54 AM
Re: Good guidelines for selecting swap space?
I agree with all others but the good place to start is to do it. Actually the swap is determind with the physical ram that is defined in the system . Genreally for systems mid range ones with RAm ranign form 4gb to 8-10 GB , it is better to have swap betwwnn 1-2 times the size of RAM and more the Physical the lesser the swap required . SO start with the same size ( I beleive you would be using 4-10GB RAM size ) and then go to tune using tools to display swapinfo etc .
Manoj Srivastava
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тАО07-03-2001 10:59 AM
тАО07-03-2001 10:59 AM
Re: Good guidelines for selecting swap space?
explains in detail how swap is used in HP-UX.