Well, thank you very much for the detailed explanation. Every thing is clear now... On 1 במרס 2012 12:35, "Steffen Maier" <ma...@linux.vnet.ibm.com> wrote:
> On 03/01/2012 09:50 AM, Offer Baruch wrote: > >> I am using the /etc/sysconfig/mkinitrd/**modules file to specify the zfcp >> module... But i did not run zipl as i only replaced the initrd. I thought >> that zipl should only run if you change zipl.conf. I tried to run zipl and >> the old luns are gone... >> > > You were lucky you could even reboot with having the initrd updated but > not run zipl. Actually zipl still booted the old initrd whose sectors were > still on disk but already freed by the filesystem on generating the new > initrd (the latter created a new initrd file and did an unlink on the old > initrd). During time or on disk space pressure, old freed sectors will be > overwritten and your old initrd content will be destroyed. Once that has > happened you could no longer boot. > > Please can you explain what zipl does with the initrd file? >> > > I'm certainly no zipl expert and my colleagues will hopefully correct me. > Generally, for anything that is needed to boot -- and this include kernel, > parm file, and initrd -- the actual current disk sectors where the file > content can be found is figured out by zipl and written in a so-called > bootmap. On IPL, zipl uses this boot map to find the file content because > it does not understand the Linux file systems. > > On intel grub only points to the initrd file. Why is there any difference? >> > > Grub (on any platform it is ported to) does understand Linux filesystems > and therefore does not need an updated bootmap each time the content or > sector layout of file needed to boot changed on disk. > In that respect, zipl is more like lilo rather than grub. > > Steffen > > Linux on System z Development > > IBM Deutschland Research & Development GmbH > Vorsitzende des Aufsichtsrats: Martina Koederitz > Geschäftsführung: Dirk Wittkopp > Sitz der Gesellschaft: Böblingen > Registergericht: Amtsgericht Stuttgart, HRB 243294 > > ------------------------------**------------------------------**---------- > 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<http://www.marist.edu/htbin/wlvindex?LINUX-390> > ------------------------------**------------------------------**---------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > ---------------------------------------------------------------------- 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/
