topic Re: Interleave swapping in Operating System - HP-UX

Interleave swapping

dipesh_2 — Mon, 27 Feb 2006 07:59:13 GMT

what is the interleave swapping?

Re: Interleave swapping

xertusit — Mon, 27 Feb 2006 08:56:52 GMT

FROM: http://docs.hp.com/en/B2355-90950/ch06s03.html

Interleave device swap areas for better performance.

Two swap areas on different disks perform better than one swap area with the equivalent amount of space. This allows interleaved swapping which means the swap areas are written to concurrently, minimizing disk head movement, thus enhancing performance.

Re: Interleave swapping

Patrick Wallek — Mon, 27 Feb 2006 09:26:36 GMT

Yes, it can enhance swap performance, BUT worrying about swap performance (to quote another Forumer) "is like rearranging the deck chairs on the Titanic". There really isn't any point. If you are swapping that much then the performance of your machine is going to be so bad that swap interleaving will not help much.

Re: Interleave swapping

Chauhan Amit — Tue, 28 Feb 2006 00:31:30 GMT

Suppose you create a primary swap (on vg00) with a default priority=1 and another device swap on another volume group with a higher priority (i.e 0). Now if you add third device swap on a separate physical disk from either the primary swap or the device one and If you set the priority of the swap device to "0" also , then Interleaving will then occur between the two secondary devices with priority given to them over the primary swap device.

Re: Interleave swapping

dipesh_2 — Tue, 28 Feb 2006 01:43:58 GMT

Thanks all