Re: booting from the other disk of a RAID-1
On Wed, Jun 29, 2011 at 5:11 PM, lee l...@yun.yagibdah.de wrote: Tom H tomh0...@gmail.com writes: On Tue, Jun 28, 2011 at 10:36 AM, lee l...@yun.yagibdah.de wrote: the mainboard and found out that I can boot from only one of the disks in the RAID-1. Booting from the other one put me into a blank screen, without grub showing up. It doesn't work as it's supposed to. How can I fix it? dpkg-reconfigure grub-pc and choose both disks when asked about grub install devices. Thanks, that probably fixed it :) Only one of the two disks in the RAID-1 was selected for installing grub, and now I selected the other one as well. Next time I reboot, I can try it out ... You're welcome. Good luck... -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/CAOdo=sywevoesqbki_jf7d+cboukzsnx8cbw1uwdfpymyrh...@mail.gmail.com
Re: booting from the other disk of a RAID-1
On 29/06/11 00:42, lee wrote: Scott Ferguson prettyfly.producti...@gmail.com writes: On 28/06/11 19:15, lee wrote: I'm glad it helped you and Peter. Now the question is how to actually solve the problem that one can boot from only one of the disks in a RAID-1 array. The point is to still be able to run the system when a disk fails. Should the one you boot from fail and you halt the system to replace it, how do you boot? Insert usbkey with backup grub - boot from usbkey. How do you make such an USB key? It would be nice to have in case anything fails, yet it shouldn't be needed. Being able to boot despite one of the disks in the RAID-1 has failed is one of the advantages of having a RAID-1 I don't want to miss. USB-keys are small and can be very hard to find. Perhaps I shouldn't even make such an USB-key because if I do, it won't take long for the disk to fail and the USB-key will, of course, have disappeared: Murphys law ... Example where grub2 is installed to the mbr and /boot is located on the first primary partition formatted as ext3. Create a primary partition on the usbkey larger than the space taken by /boot. Format the partition as ext3. Copy /boot/* to the new partition on the usbkey. Ensure the usbkey is not mounted:- # grub-setup --force /dev/usbkey_device NOTE: the last command executes very fast. There appears to be a way to get grub-setup to do the copying for you - I just haven't taken the time to figure it out yet. :-/ Also worth a look is grub-mkrescue which can create floppy and cd images. I use some scripting to do this, create a package list, and backup key config files, to a USB-key after most builds. dd is then used to backup the USB-key so that many different backup/recovery/rebuild setups can easily be stored - and quickly re-written to a USB-key. Cheers -- I just have one of those faces. People come up to me and say, What's wrong? Nothing. Well, it takes more energy to frown than it does to smile. Yeah, you know it takes more energy to point that out than it does to leave me alone? ~ Bill Hicks -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4e0acb86.6030...@gmail.com
Re: booting from the other disk of a RAID-1
Tom H tomh0...@gmail.com writes: On Tue, Jun 28, 2011 at 10:36 AM, lee l...@yun.yagibdah.de wrote: the mainboard and found out that I can boot from only one of the disks in the RAID-1. Booting from the other one put me into a blank screen, without grub showing up. It doesn't work as it's supposed to. How can I fix it? dpkg-reconfigure grub-pc and choose both disks when asked about grub install devices. Thanks, that probably fixed it :) Only one of the two disks in the RAID-1 was selected for installing grub, and now I selected the other one as well. Next time I reboot, I can try it out ... -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/87r56c5on4@yun.yagibdah.de
booting from the other disk of a RAID-1 (was: Needed: a grub2 expert)
Scott Ferguson prettyfly.producti...@gmail.com writes: On 28/06/11 05:00, lee wrote: martin f krafft madd...@debian.org writes: snipped He could try to turn off USB legacy support in the BIOS. Thank you! Different issue - but that fixed it! :-) I'm glad it helped you and Peter. Now the question is how to actually solve the problem that one can boot from only one of the disks in a RAID-1 array. The point is to still be able to run the system when a disk fails. Should the one you boot from fail and you halt the system to replace it, how do you boot? -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/87aad2gvuz.fsf...@yun.yagibdah.de
Re: booting from the other disk of a RAID-1 (was: Needed: a grub2 expert)
also sprach lee l...@yun.yagibdah.de [2011.06.28.1115 +0200]: I'm glad it helped you and Peter. Now the question is how to actually solve the problem that one can boot from only one of the disks in a RAID-1 array. The point is to still be able to run the system when a disk fails. Should the one you boot from fail and you halt the system to replace it, how do you boot? Grub resides on all components of the array (ideally in their MBR). It loads off any one of them and then runs its own RAID-assembly code, which can assemble a degraded RAID-1. Then it loads kernel and initrd from the filesystem on that array and passes control to the kernel… -- .''`. martin f. krafft madduck@d.o Related projects: : :' : proud Debian developer http://debiansystem.info `. `'` http://people.debian.org/~madduckhttp://vcs-pkg.org `- Debian - when you have better things to do than fixing systems whale feces or working at microsoft? i would probably be the whale feces researcher. salt air and whale flatulence; what could go wrong? -- michael moyer, executive editor of _popular science_ digital_signature_gpg.asc Description: Digital signature (see http://martin-krafft.net/gpg/sig-policy/999bbcc4/current)
Re: booting from the other disk of a RAID-1
On 28/06/11 19:15, lee wrote: Scott Ferguson prettyfly.producti...@gmail.com writes: On 28/06/11 05:00, lee wrote: martin f krafft madd...@debian.org writes: snipped He could try to turn off USB legacy support in the BIOS. Thank you! Different issue - but that fixed it! :-) I'm glad it helped you and Peter. Now the question is how to actually solve the problem that one can boot from only one of the disks in a RAID-1 array. The point is to still be able to run the system when a disk fails. Should the one you boot from fail and you halt the system to replace it, how do you boot? Insert usbkey with backup grub - boot from usbkey. Cheers -- I have a scoop for you. I stole his act. I camouflaged it with punchlines, and to really throw people off, I did it before he did. ~ Bill Hicks (on Dennis Leary) -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4e099d0d.6060...@gmail.com
Re: booting from the other disk of a RAID-1
martin f krafft madd...@debian.org writes: also sprach lee l...@yun.yagibdah.de [2011.06.28.1115 +0200]: I'm glad it helped you and Peter. Now the question is how to actually solve the problem that one can boot from only one of the disks in a RAID-1 array. The point is to still be able to run the system when a disk fails. Should the one you boot from fail and you halt the system to replace it, how do you boot? Grub resides on all components of the array (ideally in their MBR). It loads off any one of them and then runs its own RAID-assembly code, which can assemble a degraded RAID-1. Then it loads kernel and initrd from the filesystem on that array and passes control to the kernel… Yes, that's what I was expecting. About two weeks ago, I had to replace the mainboard and found out that I can boot from only one of the disks in the RAID-1. Booting from the other one put me into a blank screen, without grub showing up. It doesn't work as it's supposed to. How can I fix it? -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/8739iukopv@yun.yagibdah.de
Re: booting from the other disk of a RAID-1
Scott Ferguson prettyfly.producti...@gmail.com writes: On 28/06/11 19:15, lee wrote: I'm glad it helped you and Peter. Now the question is how to actually solve the problem that one can boot from only one of the disks in a RAID-1 array. The point is to still be able to run the system when a disk fails. Should the one you boot from fail and you halt the system to replace it, how do you boot? Insert usbkey with backup grub - boot from usbkey. How do you make such an USB key? It would be nice to have in case anything fails, yet it shouldn't be needed. Being able to boot despite one of the disks in the RAID-1 has failed is one of the advantages of having a RAID-1 I don't want to miss. USB-keys are small and can be very hard to find. Perhaps I shouldn't even make such an USB-key because if I do, it won't take long for the disk to fail and the USB-key will, of course, have disappeared: Murphys law ... -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/87y60mj9u6@yun.yagibdah.de
Re: booting from the other disk of a RAID-1
On Tue, Jun 28, 2011 at 10:36 AM, lee l...@yun.yagibdah.de wrote: martin f krafft madd...@debian.org writes: also sprach lee l...@yun.yagibdah.de [2011.06.28.1115 +0200]: I'm glad it helped you and Peter. Now the question is how to actually solve the problem that one can boot from only one of the disks in a RAID-1 array. The point is to still be able to run the system when a disk fails. Should the one you boot from fail and you halt the system to replace it, how do you boot? Grub resides on all components of the array (ideally in their MBR). It loads off any one of them and then runs its own RAID-assembly code, which can assemble a degraded RAID-1. Then it loads kernel and initrd from the filesystem on that array and passes control to the kernel… Yes, that's what I was expecting. About two weeks ago, I had to replace the mainboard and found out that I can boot from only one of the disks in the RAID-1. Booting from the other one put me into a blank screen, without grub showing up. It doesn't work as it's supposed to. How can I fix it? dpkg-reconfigure grub-pc and choose both disks when asked about grub install devices. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/BANLkTimVLaAXXDmYno9dfdagEF=+iT=r...@mail.gmail.com
Re: booting from the other disk of a RAID-1
also sprach lee l...@yun.yagibdah.de [2011.06.28.1642 +0200]: How do you make such an USB key? It would be nice to have in case anything fails, yet it shouldn't be needed. search for super grub disk -- .''`. martin f. krafft madduck@d.o Related projects: : :' : proud Debian developer http://debiansystem.info `. `'` http://people.debian.org/~madduckhttp://vcs-pkg.org `- Debian - when you have better things to do than fixing systems when women love us, they forgive us everything, even our crimes; when they do not love us, they give us credit for nothing, not even our virtues. -- honoré de balzac digital_signature_gpg.asc Description: Digital signature (see http://martin-krafft.net/gpg/sig-policy/999bbcc4/current)
Re: booting from the other disk of a RAID-1
also sprach lee l...@yun.yagibdah.de [2011.06.28.1636 +0200]: It doesn't work as it's supposed to. How can I fix it? Reinstall grub to all devices, dpkg-reconfigure grub-pc -- .''`. martin f. krafft madduck@d.o Related projects: : :' : proud Debian developer http://debiansystem.info `. `'` http://people.debian.org/~madduckhttp://vcs-pkg.org `- Debian - when you have better things to do than fixing systems i worked myself up from nothing to a state of extreme poverty. -- groucho marx digital_signature_gpg.asc Description: Digital signature (see http://martin-krafft.net/gpg/sig-policy/999bbcc4/current)
