topic Re: Increasing Memory in Operating System - HP-UX

Increasing Memory

April Bernard — Wed, 12 Apr 2000 07:07:31 GMT

I recently bought a new memory board to increase my computers memory. I just
installed it but afterwards starting questioning myself as to if there was
anything special that I needed to do before installing it? I had a 32mb
already in it and added a 128 mb to make it a total of 160mb.

Re: Increasing Memory

Terja Lange_1 — Wed, 12 Apr 2000 20:47:32 GMT

When you increase memory, increase the swap. Add another swap area, or increase
the one you have already.
If you have the luxury of having another swap area of same size on another
disk, this would be an advantage.
to list what is alredy configured do
swapinfo

Remember, you need upto 2.5 * memory for swap

to create another swap area

lvcreate -C y -s -r -n swap2 /dev/vg00
swapon /dev/vg00/swap2
dont forget to add it to fstab

Re: Increasing Memory

Bill Hassell — Mon, 29 May 2000 20:09:05 GMT

Actually, the amount of swap space needed is very much dependent on what you will run at the same time, and also whether you have swapmem_on set to 1. If you have 1000 megs of RAM and want to run 1000 megs of programs, you'll need 1000 megs of swap space for mapping (when swapmem_on is 0). However, if you turn swapmem_on to 1 (a kernel parameter) then you only need swapspace to accomodate processes that total more than 75% of RAM. For example, 1000 megs of RAM plus 100 megs of swap will allow up to 750 megs + 100 megs = 850 megs of programs to run at the same time.

Re: Increasing Memory

Dave Wherry — Tue, 30 May 2000 13:05:23 GMT

I don't think the lvcreate command will work on a PC. If you look at the memory sizes she is talking about, I believe this is a PC. A 9000 box with 32MB of RAM isn't going to do much.
April, you should post your question in the PC forum.

Re: Increasing Memory

Sunny Chen — Tue, 30 May 2000 14:12:41 GMT

Yes, It looks like a PC, and if that is for a PC, it is up to what kind of Motherboard and Ram you choose, otherwise, PC will not boot up. According to your distribsion, it looks like you are using an old model PC, if you use MS-NT, just make sure you need update the PAGE FILE size in NT, it is the same idea as swap for UNIX, you can go to Control Panel, System, System performence and Virtual Memory, and change the Virtual Memory size to change the Page File size.

Re: Increasing Memory

CHRIS_ANORUO — Tue, 30 May 2000 15:43:47 GMT

April,

This question belongs to Workstations (HP Visualize- NT based)

Cheers!

Re: Increasing Memory

William Dy — Tue, 30 May 2000 17:59:54 GMT

Really, no. There shouldn't be anything that you need to do. The system should just recognize the additional memory that you got. If the system doesn't see it, then maybe you might have to flik some switches, but most new systems boards doesn't have this function anymore.

UNIX (and NT?) is smart enough to recognise the total physical memory that is installed.