On Tue, 2004-03-02 at 22:32, Adam Thornton wrote:
> mkswap /dev/dcssblk/dcssname > swapon /dev/dcssblk/dcssname No no, not like that. The cute thing about swapping into an EW DCSS is that you can save the DCSS such that it is a pre-initialized swap device and don't have to mkswap on it. So you could include it in fstab. Too bad you still need to tell the driver to attach the segment. I suppose it could be helpful if the driver would read a config file when it starts. Obviously being able to attach extra RW memory requires authorization because it would let you get a larger share of real memory than the virtual machine size was set up for. If you allow everyone to have one copy of the swap DCSS you can make it EW. If you want only some people to use it you can make it restricted and give some a NAMESAVE statement. I expect swapping in DCSS to be slightly more efficient than in VDISK, although both build on the same z/VM infrastructure. The difference is that you can swap in DCSS under SIE and don't break out to CP to have it do the work for you. But I don't have any numbers right now beyond the work we did for the ISP/ASP redbook where the appendix has such a DCSS driver. Rob
