Hi, VMSES have a command to help create and maintain the segments. See: HELP VMSES VMFSGMAP Regards, ______________________________________________ Clovis
From: Kris Buelens <kris.buel...@gmail.com> To: IBMVM@listserv.uark.edu Date: 25/05/2011 01:37 Subject: Re: z/VM bug, Linux bug, or operator error? Sent by: The IBM z/VM Operating System <IBMVM@listserv.uark.edu> Saved segments are based on the architected segments found in the z architecture. A segment is a whole number of megabytes. So, FILE FILENAME FILETYPE BEGPAG ENDPAG TYPE CL #USERS 0054 ITMV1A DCSSG 0000000280000 00000002FFE00 SR A 00000 uses segments 280 through 2FF (that is; it covers addresses 280000 through 2FFFFF) and that overlaps the beginning address of 0055 ITMV1B DCSSG 00000002FFE01 000000037FD00 SR A 00000 Change the definitions to FILE FILENAME FILETYPE BEGPAG ENDPAG TYPE CL #USERS 0054 ITMV1A DCSSG 0000000280000 00000002FFFFF SR A 00000 0055 ITMV1B DCSSG 0000000300000 000000037FD00 SR A 00000 and the segments will no longer overlap. If you really must work with segments on page boundary and load them together, you can use segment spaces and segment members: DEFSEG ITMV1A 280000-2FFE00 SR SPACE ITM DEFSEG ITMV1B 2FFE01-37FD00 SR SPACE ITM The segment space named ITM would cover address range 280000-37FFFF. When loading one member, CP will almost do as if it loads the whole space (CP must obey to the z architecture, with segments on megabyte boundaries), the second member can then also be loaded. But, the resultant space covers a range > 2GB, which I think is not supported either. Segment spaces were invented when we used to store all (or many) segments below the 16MB line, very small when installing many program products... I never used DCSSes above 2GB, maybe extra restrictions apply. 2011/5/25 Mark Post <mp...@novell.com> Cross-posted to IBMVM and Linux-390 I'm working on a project where I want an xip2 file system that is larger than 2GB. So, I'm trying to use the support built into z/VM and Linux to logically concatenate multiple DCSS into one. But, I can't seem to get it to work. I can load one segment or the other, but not both. The message that comes out on the console is extmem.cb0afe: ITMV1B needs used memory resources and cannot be loaded or queried "man extmem.cb0afe" says "You cannot load or query the DCSS because it overlaps with an already loaded DCSS or with the memory of the z/VM guest virtual machine (guest storage)." I don't believe any of those apply, but I need someone to tell me what to do differently, or to whom I should be complaining. The segments are defined as this: FILE FILENAME FILETYPE BEGPAG ENDPAG TYPE CL #USERS 0054 ITMV1A DCSSG 0000000280000 00000002FFE00 SR A 00000 0055 ITMV1B DCSSG 00000002FFE01 000000037FD00 SR A 00000 The guest virtual storage is 1GB: #CP Q V STOR STORAGE = 1G The kernel was booted with a mem= value sufficient to contain the highest address of the ITMV1B DCSS: # cat /proc/cmdline root=/dev/disk/by-path/ccw-0.0.9300-part1 TERM=dumb mem=16384M BOOT_IMAGE=0 The command to allocate the two DCSS is: echo itmv1a:itmv1b > /sys/devices/dcssblk/add And that's where I get my error (after 2 minutes). As I said previously, if I try to load them individually, I can do one or the other, but not both. This is an up to date SLES11 SP1 system, running on z/VM 6.1 RSU 1003. Does anyone see the problem? Mark Post -- Kris Buelens, IBM Belgium, VM customer support
