usb raid1 pendrive boot
Did anyone managed to boot from RAID1? Lenny gives this error message: mdadm: no devices found for /dev/md0 I just want to install Debian Lenny on two pendrives [in sRAID1], so that the HDD's in the pc can be used only as data containers, but it gives this error message. Please help me. Thank you! -- 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/1273231268.5627.27.ca...@localhost
usb raid1 pendrive boot
Did anyone managed to boot from RAID1? Lenny gives this error message: mdadm: no devices found for /dev/md0 I just want to install Debian Lenny on two pendrives [in sRAID1], so that the HDD's in the pc can be used only as data containers, but it gives this error message. Please help me. Thank you! -- 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/1273231027.5627.21.ca...@localhost
usb raid1 pendrive boot
Did anyone managed to boot from RAID1? Lenny gives this error message: mdadm: no devices found for /dev/md0 I just want to install Debian Lenny on two pendrives [in sRAID1], so that the HDD's in the pc can be used only as data containers, but it gives this error message. Please help me. Thank you! -- 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/1273231179.5627.25.ca...@localhost
Re: usb raid1 pendrive boot
Jozsi Vadkan wrote: Did anyone managed to boot from RAID1? Lenny gives this error message: mdadm: no devices found for /dev/md0 I just want to install Debian Lenny on two pendrives [in sRAID1], so that the HDD's in the pc can be used only as data containers, but it gives this error message. Please help me. Thank you! If you don't know why this is happening, then you shouldn't be doing this! This is because you don't have the md driver _in_ the kernel You'll need a small i.e. 20-30MB partition out of raid to boot from with i.e. initrd which loads the md driver and your raid device becomes visible. It doesn't matter if it's a pendrive or something else. regards -- 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/hs10l8$t0...@dough.gmane.org
Re: usb raid1 pendrive boot
But i thought that, I can boot from RAID1 under Lenny. So i can't? So the solution is that I need a separate /boot partition? But the RAID will be useless then... 2010. 05. 7, péntek keltezéssel 14.22-kor deloptes ezt írta: Jozsi Vadkan wrote: Did anyone managed to boot from RAID1? Lenny gives this error message: mdadm: no devices found for /dev/md0 I just want to install Debian Lenny on two pendrives [in sRAID1], so that the HDD's in the pc can be used only as data containers, but it gives this error message. Please help me. Thank you! If you don't know why this is happening, then you shouldn't be doing this! This is because you don't have the md driver _in_ the kernel You'll need a small i.e. 20-30MB partition out of raid to boot from with i.e. initrd which loads the md driver and your raid device becomes visible. It doesn't matter if it's a pendrive or something else. regards -- 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/1273236024.5627.32.ca...@localhost
Re: usb raid1 pendrive boot
Jozsi Vadkan wrote: But i thought that, I can boot from RAID1 under Lenny. So i can't? As matter of fact there is not enough information to say exactly what's your issue, but this is an option I would check. So the solution is that I need a separate /boot partition? In your case if the md driver is not compiled into the kernel But the RAID will be useless then... No because you can have those 30MBs backuped and restored easily - the raid is holding the data. You can also try debugging the initrd you are using to see what is going on or give us more information on your setup - partitioning, grub/lilo setup etc. there are many ways to get the job done! regards -- 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/hs12pp$9s...@dough.gmane.org
Re: usb raid1 pendrive boot
also sprach Jozsi Vadkan jozsi.avad...@gmail.com [2010.05.07.1440 +0200]: But i thought that, I can boot from RAID1 under Lenny. So i can't? You should be able to, using grub-pc. Try passing rootdelay=15 to the kernel boot command line. If this doesn't work, you'll need to provide a lot more information about what you are trying to do, what you did, what you are expecting, and what exactly you are seeing. -- .''`. martin f. krafft madd...@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 during the voyage of life, remember to keep an eye out for a fair wind; batten down during a storm; hail all passing ships; and fly your colours proudly! digital_signature_gpg.asc Description: Digital signature (see http://martin-krafft.net/gpg/)
Re: usb raid1 pendrive boot
rootdelay=15 worked!!! THANK YOU!!! 2010. 05. 7, péntek keltezéssel 14.54-kor martin f krafft ezt írta: also sprach Jozsi Vadkan jozsi.avad...@gmail.com [2010.05.07.1440 +0200]: But i thought that, I can boot from RAID1 under Lenny. So i can't? You should be able to, using grub-pc. Try passing rootdelay=15 to the kernel boot command line. If this doesn't work, you'll need to provide a lot more information about what you are trying to do, what you did, what you are expecting, and what exactly you are seeing. -- 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/1273239520.5627.34.ca...@localhost
Re: usb raid1 pendrive boot
also sprach Jozsi Vadkan jozsi.avad...@gmail.com [2010.05.07.1538 +0200]: rootdelay=15 worked!!! http://git.debian.org/?p=pkg-mdadm/mdadm.git;a=blob;f=debian/FAQ;hb=HEAD#l560 -- .''`. martin f. krafft madd...@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 everyone has a little secret he keeps, i like the fires when the city sleeps. -- mc 900 ft jesus digital_signature_gpg.asc Description: Digital signature (see http://martin-krafft.net/gpg/)
Re: usb raid1 pendrive boot
On Friday 07 May 2010 08:22:00 deloptes wrote: Jozsi Vadkan wrote: Did anyone managed to boot from RAID1? Lenny gives this error message: mdadm: no devices found for /dev/md0 You'll need a small i.e. 20-30MB partition out of raid to boot from with i.e. initrd which loads the md driver and your raid device becomes visible. Just for the record, it actually *is* possible to boot off a partition that's in RAID1, but you might have to use grub. The reason it works is because grub can read past the md-raid1 metadata without getting confused -- since the raid is not running when grub is looking at the disks, it only sees one of the two, but since they're mirrored, and since grub doesn't *write* to the partition, everything works. I have several production systems that do this. It's a bit complicated to set up, but generally, it goes something like: - Install a basic system onto one drive, with the correct size of partition (call this /dev/sda1). - Set up an incomplete RAID1 array, with one device and one missing, with the second drive -- this is /dev/md0, consisting of /dev/sdb1 and an empty slot. - Configure /etc/mdadm/mdadm.conf, and re-build your initramfs so that it has the md modules and knows about the array. - Mount /dev/md0 somewhere and copy all the data off /dev/sda1 to it. It's very important to get the *new* initramfs onto the array. - Install grub in the bootloader of the 2nd drive. (The installer already did this for the first one). This actually isn't essential, but you may need it if/when /dev/sda fails. - Boot on to the incomplete RAID array -- root=/dev/md0. - Add /dev/sda1 to the array, and sync. Now you have a bootable software raid-1 system. I'm not saying this solves the OP's problem, necessarily, but it's perfectly possible. I've never tried it with LILO or grub2, but I would think it would work. -- A. -- Andrew Reid / rei...@bellatlantic.net -- 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/201005071303.20994.rei...@bellatlantic.net
More important question... (was Re: usb raid1 pendrive boot)
On 05/07/2010 06:21 AM, Jozsi Vadkan wrote: Did anyone managed to boot from RAID1? Lenny gives this error message: mdadm: no devices found for /dev/md0 I just want to install Debian Lenny on two pendrives [in sRAID1], so that the HDD's in the pc can be used only as data containers, but it gives this error message. Why the heck do you want to RAID together two thumb drives? That seems so, so, so pointless. -- Dissent is patriotic, remember? -- 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/4be48711.6020...@cox.net
Re: usb raid1 pendrive boot
also sprach Andrew Reid rei...@bellatlantic.net [2010.05.07.1903 +0200]: Just for the record, it actually *is* possible to boot off a partition that's in RAID1, but you might have to use grub. The reason it works is because grub can read past the md-raid1 metadata without getting confused Correction: the md metadata comes after the filesystem. That's why Grub1 doesn't see it. Grub2 (grub-pc) can interpret md arrays and is the preferred method. -- .''`. martin f. krafft madd...@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 zum christentum wird man nicht geboren, man muß dazu nur krank genug sein. - friedrich nietzsche digital_signature_gpg.asc Description: Digital signature (see http://martin-krafft.net/gpg/)
