🚀 go-pugleaf

iglesias@draco.acs.uci.edu (Mike Iglesias) writes:

>We have a need to add some swap space to our Symmetry system running
>Dynix 3.0.12.  We currently have an unused h partition on one of the
>disks that could be used for swap space, but I'm not sure if Dynix can
>use that partition for swap space.  I've looked thru the manuals and
>can't find any mention of it.  Does anyone know if Dynix can swap
>on a non-b partition?

Sure.  We desperately needed more swap space, so we turned the c
partition (all) of a SCSI drive (yea, SLOW) into swap space.

When you specify swap paritions in the config file for your kernel
(/usr/sys/conf/<whatever>), if you say just "zd0" or "sd1", config
assumes the b partition.  Just specify the parition you want to swap
on, and it should work.  I.E., we have:

## kernels to configure ##
config dynix_zd root on zd0a swap on zd0 and zd1 and zd2 and sd1c

Feel free to ask me if you have any problems.  (I'm not saying I can
fix them... :-)

Brian
brsmith@cs.umn.edu

As some else mentioned, no problem swapping on partitions other than
the b partition.  On a drive that you boot from (typically drive 0),
don't use the h partition (or any partition that starts at the
beginning of the disk) as a swap or raw partition as this will
clobber the boot block at some point.  On drives that you don't boot
from, the h partition is fair game.

Neal Wyse
... uunet!sequent!neal

In article <2703D039.5509@orion.oac.uci.edu> iglesias@draco.acs.uci.edu (Mike Iglesias) writes:
>
>We have a need to add some swap space to our Symmetry system running
>Dynix 3.0.12.  We currently have an unused h partition on one of the
>disks that could be used for swap space, but I'm not sure if Dynix can
>use that partition for swap space.  I've looked thru the manuals and
>can't find any mention of it.  Does anyone know if Dynix can swap
>on a non-b partition?
>
>
>Thanks,
>
>Mike Iglesias
>University of California, Irvine
>Internet:    iglesias@draco.acs.uci.edu
>BITNET:      iglesias@uci
>uucp:        ...!ucbvax!ucivax!iglesias


I'm a little behind in this newsgroup so if this has been answered forgive
the redundancy.

While the b partitions are the most optimal for swapping because of their 
location you can use any partiton you want including c's.  If you were to 
list all the partitions I use for swap on all my systems you'd see that at
least one of each was in use, except the a's.

There are some things to remember:
	channel/disk saturation.  Run vmstat with a short interval like 1 sec
	to see what kind of activity is already going on on the disk in question.

	NEVER make 0h a raw partition of any kind as the bootstrap will 
	eventually be overwritten (if you follow convention and make 0a
	your root partition that is)

	your /etc/fstab entry should look similar to:
	/dev/zd3h   swap        swap   sw              0 0

	And of course don't forget to add it to your kernel

	Good luck,
	
	Pam