On Monday, 02/16/2004 at 04:29 CST, Adam Thornton <[EMAIL PROTECTED]> wrote: > On Mon, 2004-02-16 at 15:59, Alan Altmark wrote: > > The linux term "exclusive write" is the same as the VM term "non-shared > > copy". It is NOT the same as a DCSS defined with Exclusive Write (EW) > > attributes, and it does not prevent access to the existing copy of the > > DCSS. > > OK, I think this is probably the confusing part right here. > > So the right methodology is, basically: > > do a DEFSEG/SAVESEG from CMS to set the page ranges. > DEF STOR something-smaller and IPL Linux with mem=something-big. > modprobe dcssblk and access the segment. > echo "0" > /proc/dcssblk/segment/shared > mke2fs the segment, mount it, and put stuff into it > umount it > echo "1" > /proc/dcssblk/segment/save > echo "1" > /proc/dcssblk/segment/shared
I think you have to echo "1" to /save THEN write to the dcss and umount it. Something has to "close" the DCSS file in order to cause the defseg/saveseg. According to the book the "save" is deferred until close. Alan Altmark Sr. Software Engineer IBM z/VM Development
