Quote: > Mark is correct: one automagically created partition. Worse, there > is no 'fdasd' or 'fdisk' management of that partition. WORSE STILL, > you *must* put the filesystem into the "partition" (such as it is) if > you are going to boot from this disk. A filesystem in /dev/dasdx will > be clobbered by the first stage of the boot loader, while a filesystem > in /dev/dasdx1 is protected by the extra 8K of padding. (12K total)
> I checked it again this morning. The bootstrap overwrites the root inode. Well the LDL disk layout basically consists of two blocks of data (size depends on the blocksize used for formatting) Those are being used to a) label the device and b) conatin the IPL boot code (channel programs). In theory, we could mangle the IPL code into the first 512 bytes of a filesystem which is reserved on x86 as "partition boot record", but that'd have a couple of downsides: a) the disk would not be "labled" as observed by other mainframe OSes b) this would differ from how people use Linux on other platforms where they typically do use partitions in front of the partition. Note that for LDL formatted media, you may chose to put the filesystem on the device itself (like /dev/dasdx instead of /dev/dasdx1) for volumes that you do not intend to boot from. Due to the fact that for ECKD CDL media blocks on track 0 do not have the formatted size, you cannot do the same with ECKD CDL formatted disks (filesystem corruption would be the result). with kind regards Carsten Otte IBM Linux Technology Center / Boeblingen lab -- omnis enim res, quae dando non deficit, dum habetur et non datur, nondum habetur, quomodo habenda est ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu 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/
