Swap size - 131072 MB

[f. halili]

I'm building a new machine and one of my requirements is to make swap 2.5x the memory.Memory of machine is 64 gig.

At install when I'm on the filesystem tab and chaging the the space for swap it maxed to 131072. Is there a way to set a bigger number?

Thanks,
f. halili

[Rita C Workman]

If you must put in that much swap disk, just build the box and then add swap disk afterwards.

Just a thought,
Rita

[R.O.]

Take a look to the space available for swap. You might also check the swap related kernel parameters, as "maxswapchunks", depending on the O.S. version you have.

Regards,

[Steven Schweda]

> I'm building a new machine [...]

Not a very detailed description of anything.

> [...] At install when I'm on the filesystem
> tab [...]

"At install" of what, exactly? Whose "the
filesystem tab"? After you did what?

> [...] Is there a way to set a bigger
> number?

There may be, but it might depend on what
you're doing, and with my weak psychic
powers, that's not very clear.

[f. halili]

Hi R.O.

I'm still installing from DVD, so I still can't change the maxswapchunks.

Thanks,
f. halili

[f. halili]

Hi Rita,

The 2nd swap space is a good plan. Do you know if 131072 is a true limit?

Thanks,
f. halili

[f. halili]

Hello Steven,

Here it is with more details ...

I'm building a new machine HPUX 11.31 and one of my requirements is to make swap size 2.5x the memory. Memory of machine is 64 gig.

At OS install when I'm on the filesystem tab at Ignite itool, changing the the space for swap it maxed to 131072. Is there a way to set a bigger number?


Thanks,
f. halili

[Johnson Punniyalingam · Accepted solution]

As posted above. adding secondary swap will be the better approach,

>>> chaging the the space for swap it maxed to 131072.

This could be System Default max-limit value of (Primary-swap) which can bet set.

Step for Adding Secondary swap:-


Create the logical volume for your secondary swap:
# lvcreate -L 128 /dev/vgxx

NOTE: "-L 128" is the size of desired swap

Verify the physical volume:
# pvdisplay /dev/dsk/cxdxdx

Verify the physical volume assigned to volume group:
# vgdisplay -v

Verify the logical volume:
# lvdisplay /dev/vgxx/lvolxx

Use SAM to declare your new secondary swap or use the command line:
# swapon /dev/vgxx/lvolxx

Verify it has been added in "/etc/fstab" when using SAM, or add it manually when using the command line.

Example:
/dev/vgxx/lvolxx . swap defaults 0 0

[Torsten.]

>> to make swap 2.5x the memory.


The question is if this is *really* needed and why?

What if you have - let's say 1TB RAM. Would you still need 2.5x swap size?

[f. halili]

thanks all!

[Dennis Handly]

A similar recent thread why you don't use 2.5 X for swap:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1460076