Gnu Grub Error 21
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Favorite Rating: Error 21 in grub during the upgrade to newer SLES 11 (SPx)This document (7014290) is provided subject to the disclaimer at the end of this document. Environment SUSE Linux Enterprise Server 11 Service Pack 3SUSE Linux Enterprise Server 11 Service Pack 2SUSE Linux Enterprise Server 11 Service Pack 1SUSE Linux Enterprise Server 11 Situation Server was converted from running as a "physical server" to running as a "virtual machine" running on VMware infrastructure. The http://www.techsupportforum.com/forums/f64/solved-how-to-fix-grub-error-21-a-326625.html conversion was made by using VMware vCenter Converter.SymptomsDuring the upgrade process from a previous OS version (i.e. SLES 10 SP4, or older SLES 11 SP) to a newer version of SLES 11, an error is encountered when the grub bootloader is installed. The relevant text of the error is similar to:grub> install --stage2=/boot/grub/stage2 (hd0,0)/boot/grub/stage1 d (hd0) (hd0,0)/boot/grub/stage2 0x8000 https://www.novell.com/support/kb/doc.php?id=7014290 (hd0,0)/boot/grub/menu.lstError 21: Selected disk does not existgrub> quitIf using a graphical install, you may see the following: Resolution Revert the VM back to the snapshot before applying the update/installation.Modify the /boot/grub/device.map to point to the proper disk/partition. Ideally, you will want to use either:/dev/disk/by-idor/dev/disk/by-uuidReboot and run the upgrade again. Cause After conversion to a virtual machine, the /boot/grub/device.map file no longer points to a proper device. Additional Information When the server is on physical hardware, the /boot/grub/device.map file may incorporate the driver name in the device. In our example it read like:(hd0) /dev/disk/by-id/cciss-xxxxxxxxxxxxxxxxxxxx(hd1) /dev/disk/by-id/cciss-xxxxxxxxxxxxxxxxxxxxAfter being converted to a virtual server, the old name will only work as long as grub isn't modified -- which occurs when upgrading to a new OS version or service pack. Therefore, in order to avoid this error, use the appropriate entry in /dev for your device. Try to avoid using disk names, like cciss devices, and use the links to your disks under /dev/disk/by-id or /dev/disk/by-uuid -- pointing to devices similar to /dev/sda, /dev/sdb... in most of configurations).###############################################################
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Milestone grub (Ubuntu) Edit Invalid Medium Unassigned Edit You need to log in to change this bug's status. Affecting: grub (Ubuntu) Filed here by: Sébastien Pellé When: 2004-10-11 Completed: 2012-07-23 Target Distribution Baltix BOSS Juju Charms Collection Elbuntu Guadalinex Guadalinex Edu Kiwi Linux nUbuntu PLD Linux Tilix tuXlab Ubuntu Ubuntu Linaro Evaluation Build Ubuntu RTM Package (Find…) Project (Find…) Status Importance Invalid Medium Assigned to Nobody Me Comment on this change (optional) Email me about changes to this bug report Also affects project (?) Also affects distribution/package Nominate for series Bug Description Hello, After installing Ubuntu on a clean disk, GRUB returns the following error on startup : " Grub Loading stage 1.5. Error 21 " Error 21 means : " 21 : Selected disk does not exist This error is returned if the device part of a device- or full file name refers to a disk or BIOS device that is not present or not recognized by the BIOS in the system. " My motherboard is a ABIT KR7A-RAID with a Highpoint hpt372 controller for RAID (This motherboard has two normal IDE and two IDE for RAID). This error is returned when my HDD in plugged on a "RAID" IDE. (By the way, I don't use RAID, it's a single disk). Ubuntu installation works if I plug my HDD on a normal IDE. I encounter no problem when I install Fedora Core 2 with my HDD plugged on a "RAID" IDE (and with GRUB) (so I don't think it's a BIOS problem). Thanks Add tags Tag help Joshua Bergland (josh-mrj412) wrote on 2004-10-14: #1 I would like to add that I recieved the exact same error when I tried to use Ubuntu on my system. It is a Soyo KT400 Dragon Ultra motherboard also with a Highpoint 372 IDE raid controller. I also have only a single drive plugged into the controller and this is the first time I have seen an Error 21 from Grub. I have run various other distros including Fedora and Gentoo without issue. This is also the only hard drive in the system. Christoph Bier (christoph-bier) wrote on 2004-11-03: #2 (In reply to comment #0) [...] I get the same error and a similar message GRUB loading, please wait