On 02/03/2015 05:45 PM, Alan Altmark wrote: > 1. Format the additional cylinders using the same block size as the > original. ...
Which is not needed if the underlying media is FBA. Since this *is* the Linux/390 discussion, it's fair to explain CMS FORMAT in Linux terms. It is akin to 'mformat' (from the "mtools" package) in that it combines both "low level" (blocks, tracks, cylinders) and "high level" (filesystem). MS-DOS 'format' is another which does both, for those unafraid to say "voldemort". Your step #1 there is using it for the "low level" part. One could use 'dasdfmt -d ldl' instead. Just sayin. On 02/02/2015 07:19 PM, Alan Altmark wrote: > You can't RECOMP anything larger than the originally formatted size. You > can RECOMP lower and back again, but no larger. And, yes, ADTMCYL holds > the number of formatted cylinders.. Which you changed in your step #5 (in your latter "ouch" note). > The protection is in place because of the allocation map. Unlike other > files on the disk, it is in a fixed location since it is written during > FORMAT and its size never changes, as that size is based on the size of > the disk. But if you add more cylinders, you add more blocks. And as you > do that, the allocation map has to grow. But it can't grow. It's > surrounded by other data. Am not quite following since you changed ADTMCYL, Mike calls it malleable, and Ray once had a mod for. SMOP > I have to say, it's kind of fun to lean back in my rocking chair and see > my programmer id in FORMAT (DMSFOR) from back in the mid-80s. RIP On 02/03/2015 10:08 AM, Ray Mansell wrote: > Back in those same mid-80s I added code to the FORMAT command to provide > an 'EXTEND' option. You could create a new, larger minidisk, the first > cylinders of which were a replica of the old one. Then you could simply > FORMAT the new minidisk, specifying the EXTEND option, and it would > magically grow in size to occupy all of the new space, with all of the > original files intact. Various places you could publish that. Various VMers might could make use of it. -- Rick Troth Senior Software Developer Velocity Software Inc. Mountain View, CA 94041 Main: (877) 964-8867 Direct: (614) 594-9768 [email protected] <mailto:[email protected]> ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
