Check your zipl.conf file, make sure the boot drive is correct, and rerun zipl. Your error is not related to the memory issue, the kernel can't find the boot disk.
-----Original Message----- From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Magat, Martin Sent: Wednesday, March 31, 2010 10:28 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: SLES9 zLinux on zVM Hello I am not sure if this is the right forum to send this question, but kindly hoping someone has encountered the same error: When we gave a (SUSE) SLES9 zLinux guest a 50G memory (user direct entry modification), it failed to come up with the following messages: --- RAMDISK: Couldn't find valid RAM disk image starting at 0. VFS: Cannot open root device "dasdd1" or unknown-block(0,0) Please append a correct "root=" boot option Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) 02: HCPGSP2629I The virtual machine is placed in CP mode due to a SIGP stop from CPU 01. --- But for a SLES10 to be given such a memory size, we have no problems. May I know if there are such 'memory caps' on SLES9 on z/VM? Many Thanks! Best Regards, Martin Magat ----------------------------------------------------- Please see the following link for the BlueCross BlueShield of Tennessee E-mail disclaimer: http://www.bcbst.com/email_disclaimer.shtm