swapinfo tells the real swap being utilizied?

[stephen peng]

dear all,
swapinfo -atm tells:
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 1024 0 1024 0% 0 - 1 /dev/vg00/lvol2
dev 11264 0 11264 0% 0 - 0 /dev/vg00/swap
dev 26000 0 20480 0% 0 - 2 /dev/vgswap/swap1
reserve - 15592 -15592
memory 19334 13491 5843 70%
total 57622 29083 23019 50% - 0 -
and kutune tells:
maxswapchunks 16384 - 16384
swchunk 2048 - 2048
it means the total swap the os could utilize is 16384*2048*1k=33554432k,33G,and swapinfo tells that os is utilizing 37G swap, though when I run swapon -a, I was told:
swapon: The kernel tunable parameter "maxswapchunks" needs to be increased to completely enable paging on device /dev/vgswap/swap1.
so swapinfo doesn't tell the swap it was utilizing but configurating?

could you please explain this to me?
thanks a lot

[Dennis Handly]

>kutune tells:

kctune or kmtune? What HP-UX version?

>so swapinfo doesn't tell the swap it was utilizing but configured?

It sure seems like that. It gives you how much you are using and the max disk space configured.

[Don Morris_1 · Accepted solution]

Note the third device. 26000Mb are Available (the size of the swap configured), none is used -- but only 20480Mb are free. This is the indication that the OS could not consider some of the available space free [because it couldn't represent it with the values of the tunable you have].

If you sum up the FREE column on the devices: 1024+11264+20480 = 32768Mb. (32Gb exactly). And 32768*1024 = 33554432kb... so the kernel and swapinfo are entirely in agreement. If you want the last 5520Mb of the swap device, you need to increase swchunk [as maxswapchunks is already at the maximum for 11.11, which I assume this is - as maxswapchunks was gone by 11.23]. With a swchunk of 4096, maxswapchunks of 3328 would suffice here.

[stephen peng]

Don,
thank you for your reply, I do consider you fully explain this to me.