On: Mon, May 19, 2008 at 01:43:33PM -0400,Gentry, Stephen Wrote: } How does zVM store data in it's spool file? More specifically,
Others have mentioned that the spool system, as is most CP data, is made up of 4k blocks.. A bit more detail: The data in the 4k blocks consists of CCWs that when executed will write the data. A typical layout might be: CCW1 with a data address of data1 and a length of data1 TIC (transfer in channel, i.e. a branch to CCW2 DATA1 consisting of the first data record CCW2 with a data address of data2 and a length of data2 TIC to CCW3 DATA2 second data record CCW3 etc etc until the 4k block is filled. When printing or punching, the 4k block is read in, the address portions of the CCWs is relocated to the actual address in storage, and the i/o is started pointing to CCW1. NB: The above is somewhat simplified. -- Rich Greenberg N Ft Myers, FL, USA richgr atsign panix.com + 1 239 543 1353 Eastern time. N6LRT I speak for myself & my dogs only. VM'er since CP-67 Canines:Val, Red, Shasta & Casey (RIP), Red & Zero, Siberians Owner:Chinook-L Retired at the beach Asst Owner:Sibernet-L
