It's used for DIRMAINT's directory update DELTA processing ... essentially a "scratch" compile area ... where only the directory entries that were changed are recompiled. Then the DELTA changes are dynamically linked into the online directory. This bypasses the overhead DIRMAINT used to incur for even the simplest/smallest directory change of needing to rewrite the *entire* online directory from start to end to achieve any change in the online directory.
JR (Steven) Imler CA Senior Software Engineer Tel: +1 703 708 3479 Fax: +1 703 708 3267 [EMAIL PROTECTED] > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[EMAIL PROTECTED] On Behalf Of Kris Buelens > Sent: Wednesday, February 13, 2008 04:32 PM > To: IBMVM@LISTSERV.UARK.EDU > Subject: Re: Dirmaint 1DE > > I guess DIRMAINT used 1DE to perform a test write. So its size should > be large enough to hold at most the full object directory. 19 > cylinders is a lot, yiu can have a huge source directory before that > these 19 cylinders get filled (huge: in my eyes, a lot more than 10000 > lines). > > 2008/2/13, Alain Benveniste <[EMAIL PROTECTED]>: > > The doc says : > > > > "The DIRMAINT 1DE disk must be allocated in the following > manner: For CKD > > > > devices: cylinder 0 must be 1 allocated as PERM space and > cylinder 1 thro > > ugh > > END must be allocated as DRCT space." > > > > From SDO, the drct zone on 530RES is 20 cyls, 1DE is 20 > cyls in the dir > > ectory. > > Couldn't it be a problem to have 1DE with 1 cyl less than > the drct zone ? > > > > > > Alain Benveniste > > > > > -- > Kris Buelens, > IBM Belgium, VM customer support > >
