That swap looks weird:
The swap:
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 18432 0 4096 0% 0 - 1 /dev/vg00/lvol2
reserve - 487 -487
total 18432 487 3609 3% - 0 -
First, no memory line -- so I assume you set swapmem_on to 0. More importantly, look at the device -- the device should be 18432Kb of swap -- but 0 is Used and only 4096Mb is free [4Gb].
That (strongly) implies that your swap tunables are too low to represent your swap (I think there may be cases when there's a disk error, bad clusters, etc. that can give this... but tunables are much more likely here). 4Gb assuming a 1Kb block size implies maxswapchunks * swchunk of 4194304. Being 11.11, swchunk defaults to 2048 -- so that would imply maxswapchunks of 2048 as well.
Doesn't matter hugely -- other than keeping swchunk low first is more important.
First thing to check is if the system log / dmesg output shows:
Unable to add all swap from . Increase the tunable parameter maxswapchunks by < X > and re-configure your system.
If so -- do what it says and raise maxswapchunks. Alternately, since you want 18432Mb... we can do the math real quick ourselves.. the product must be (18432 * 1024 [18874368]) so again assuming swchunk of 2048, set maxswapchunks to at least 9216 to use your full swap device.
Since SysV segments do require swap reservations -- I'll assume the os_create_region above was trying for that type of allocation... in which case it wanted 3686Mb with only 3609Mb of swap free, hence the failure.
