I checked a plain installation of Arch Linux, and it uses /dev/sda2 for swap. Do you use LVM for swap? Could you run these commands?
cat /proc/partitions pvscan lvscan vgscan
I checked a plain installation of Arch Linux, and it uses /dev/sda2 for swap. Do you use LVM for swap? Could you run these commands?
cat /proc/partitions
pvscan
lvscan
vgscan