>-----Original Message----- >From: ataraid-list-bounces@xxxxxxxxxx [mailto:ataraid-list- >bounces@xxxxxxxxxx] On Behalf Of Steve S. >Sent: Monday, August 22, 2005 10:06 PM >To: ataraid-list@xxxxxxxxxx >Subject: How-to for dmraid OS drive(s)? > >Hello - > >Can anyone point me to a step-by-step guide to putting the OS (Fedora >Core 4 in my case) on a dmraid mirror? I currently have the OS on a >pair of failing ATA drives and dmraid sees the new drives no problem. >Specifically, I've seen references on this list and elsewhere to having >to customize init scripts and (potentially) patching grub to make this work. > >Ah, and if anyone can point me to a best-practice guide to migrating all >the data incl. the OS from the old drives to the new, that would be good >too. I'm sure I could fumble my way through it on my own, but I'd >rather do it the "right" way. > >Is lvm with dmraid an impossibility? My apologies if these questions >have been answered already -- but I have done a lot of searching on line >(through this list, google searches, etc.) with very little results. > >TIA, > >Steve On my SIL 3114 chip, I have successfully migrated a system to raid, here is the operation step: Steps to port an existed system to SATA RAID: 1. Prepare an auxiliary hard disk with a system installed, for example, EL4. 2. Make Stripe (RAID 0) with the help of utility of Silicon Image at the stage right after Power on self test and before the start of grub. 3. Boot up the EL4 host on the auxiliary hard disk. 4. Active the RAID with the help of dmraid, and the new device called /dev/dm-0 can be seen. 5. Use fdisk or parted to slice hard disk partitions on device of /dev/dm-0. Typically one for /boot, the other on for swap, and the last one for /, don't forget to active boot flag of the partition for /boot. After doing that, device called /dev/dm-1, /dev/dm-2 and /dev/dm-3 can be seen, also device mapper under /dev/mapper appears. For controller of SIL 3114 CTU, there are sil_afageidcdibjb and sil_afageidcdibjb1 etc. 6. Make file system on /dev/dm-1 and /dev/dm-3 with the utility of mkfs. 7. Mount /dev/dm-1 foo and mount /dev/dm-3 bar. 8. Copy all files under /boot to foo and files under / to bar, with cp -au, like cp -au /boot foo. For the copying of /, the top level directories need to be copied separately to exclude the mount point of /dev/dm-1 and mount point of /dev/dm-3. 9. manually install GRUB to the device of dm-0, like: 9.1 Call grub --device=/dev/null to enter grub shell. 9.2 Grub>device /dev/mapper/sil_afageidcdibjb (hd0) [Caution: can't use /dev/dm-0 here] 9.3 Grub>geometry (hd0) [check if the right device is mapped to (hd0), if it is right, you can see that there are three partitions] 9.4 Grub>root (hd0,0) [successfully execution, grub can recognize the file system on /dev/dm-1] 9.5 Grub>setup (hd0) [install the grub to /dev/dm-0, ie. /dev/mapper/sil_afageidcdibjb , every stage should be successful] 9.6 Grub>quit Note: before install the grub, the grub.conf may be kept as simple as possible. It is better to comment some options like splashimage and hiddenmenu to ensure the successfully display of the grub menu after reboot. 10. Copy the dmraid.static to /sbin. This utility is the static link version of dmraid and is needed at intird stage. It is not included in the distribution of EL4, but it can be found at the distribution of Fedora4, just copy it. 11. Path the mkinird, see the end. 12. make initrd with mkinitrd, like mkinitrd initrd.new `uname -r` 13. copy the initrd.new to foo. 14. edit the foo/grub/grub.conf to provide entry of current kernel and the new initrd.img. Like: title SATA RAID root (hd0,0) kernel /vmlinuz-2.6.9-5...... root=/dev/dm-3 .... initrd /initrd.new 15. Edit the bar/ect/fstab to change the device of root file system, like: /dev/dm-3 / ext3 defaults 1 1 /dev/dm-1 /boot ext2 defaults 1 2 /dev/dm-2 swap swap defaults 0 0 .................................... 16. halt -p to stop the current system. 17. Detach the auxiliary hard disk. And re-power on the machine. Enjoy it! patch for /sbin/mkinitrd --- mkinitrd 2004-10-25 06:01:52.000000000 +0800 +++ mkinitrd.new 2005-07-01 07:12:33.000000000 +0800 @@ -733,6 +733,18 @@ elif [ -n "$root_lvm" ]; then fi fi +#add to active dmraid +if [ -x /sbin/dmraid.static -a -x /sbin/dmsetup -a -e /dev/mapper/control ]; then + dmout=$(/sbin/dmsetup ls 2>/dev/null) + if [ "$dmout" != "No devices found" -a "$dmout" != "" ]; then + inst /sbin/dmraid.static $MNTIMAGE/sbin/dmraid + echo "echo Making device-mapper control node" >> $RCFILE + echo "mkdmnod" >>$RCFILE + echo "echo Running dmraid to active reid" >>$RCFILE + echo "/sbin/dmraid -ay" >>$RCFILE + fi +fi + echo "echo Creating root device" >> $RCFILE echo "mkrootdev /dev/root" >> $RCFILE rootdev=/dev/root _______________________________________________ Ataraid-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ataraid-list
