>
> I use 3 swap disks in decending priority order.
>
> 1.  vdisk  30-50 MB (depending on system)
> 2.  vdisk  2-4 times bigger then the first swapdisk (unless this is a
> test system then I use real disk)
> 3.  real disk to double the previous swap defined.

Similarly, I use eight, defined in the CP directory as:
* /dev/dasds
MDISK 212 FB-512 V-DISK   2000 MR
* /dev/dasdt
MDISK 213 FB-512 V-DISK   4000 MR
* /dev/dasdu
MDISK 214 FB-512 V-DISK   8000 MR
* /dev/dasdv
MDISK 215 FB-512 V-DISK  16000 MR
* /dev/dasdw
MDISK 216 FB-512 V-DISK  32000 MR
* /dev/dasdx
MDISK 217 FB-512 V-DISK  64000 MR
* /dev/dasdy
MDISK 218 FB-512 V-DISK 128000 MR
* /dev/dasdz
MDISK 219 FB-512 V-DISK 256000 MR

Totals about 256 MB. Swap space then tends to find its own level. I
normally don't have to worry about whether enough space is allocated. If
monitoring shows that the larger swap disks are being used, I know it's
probably time to increase the virtual storage size. If the smaller disks
aren't being used, it's time to reduce the virtual storage size.

I use SWAPGEN to format them and, yes, you need to monitor page space. I
have four dedicated 3390-9 volumes for paging, and so far page space hasn't
been an issue.

Mark Wheeler, 3M Company

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