Thanks, this is great. A couple of follow-up questions: 1. How do I get to single user mode without rebooting? (I know I should already know this.)
2. Do I need to do anything special to copy the partitions from /dev/hdaX to /dev/mdY? Once I'm in single user mode can I just "cp -R /dev/hdaX /dev/mdY"? Or, will I need do something like the HOWTO suggests for the root filesystem for all the filesystems: - create /mnt/newroot - then: cd / find . -xdev | cpio -pm /mnt/newroot Thanks. Richard --- Dave Sherohman <[EMAIL PROTECTED]> wrote: > On Fri, Feb 22, 2002 at 10:32:17AM -0800, Richard > Weil wrote: > > I need some help setting up RAID 1 on a fresh > Woody > > install. The software is newer than the docs, > > particularly for Lilo, so any help from those with > > experience would be most appreicated. > > The Software-RAID-HOWTO got me through this one. > > > My hda and hdc drives are identical in size. hda > is > > divided into multiple partitions -- / (/dev/hda2), > > /boot (/dev/hda1), /home (/dev/hda5), /usr > > (/dev/hda6), /var (/dev/hda7). There is nothing on > hdc > > yet. > > Step 1: Partition hdc just like hda. You should > probably set your > partitions to type FD on both drives if you haven't > done so already. > > > If anyone has a similar setup already working, I'd > > love to see their /etc/raidtab > > Just lots of sections that look like: > > raiddev /dev/md0 > raid-level 1 > nr-raid-disks 2 > nr-spare-disks 0 > persistent-superblock 1 > chunk-size 4 > device /dev/hdg1 > raid-disk 0 > device /dev/hde1 > raid-disk 1 > > > and lilo.conf files > > Pretty bog-standard, aside from the lines: > > boot=/dev/md0 > root=/dev/md0 > > > with a brief description of how to get it working > > without deleting anything on hda (i.e., > reformating > > the drive). > > 1. Partition both drives identically. Make sure > that no partitions > on hdc (except for swap - swap can stripe itself, so > don't RAID it) > are larger than the corresponding partitions on hda. > > 2. Install on hda. > > 3. Create your /etc/raidtab with an md device for > each non-swap > partition on hda/hdc. For now, set up the last 4 > lines of each md > device like so: > > device /dev/hdcX > raid-disk 0 > device /dev/hdaX > failed-disk 1 > > Note that the partition on hdc is listed first and > the partition on > hda is listed as a failed-disk instead of a > raid-disk. > > 4. Start your RAID devices with raidstart. They > will all be > degraded (due to the "failed" partitions on hda), > but that's what you > want at this point. Format the md devices with, > e.g., "mke2fs > /dev/mdX". > > 5. In single-user mode, copy each partition from > hda to the > corresponding md device. After copying the root > partition over, edit > the copy of etc/fstab on the RAID (i.e., > /mnt/etc/fstab) to reference > the appropriate md devices instead of the partitions > on hda. > > 6. Edit lilo.conf, changing the boot and root > devices to /dev/md0 > and re-run lilo. > > 7. Reboot. When the system comes back up, use > mount to check > whether your system is mounted from hda or the RAID > devices. It > should now be on RAID. > > 8. Change your partition types on hda to FD if you > haven't already > done so, change all the failed-disk directives in > /etc/raidtab to > raid-disk, and add the partitions from hda using > raidhotadd. > > And you're done. Easy as that. > > > - Can I create a single RAID device (md0) that > > mirrors all of the hda/c, or do I need to create > > separate RAID devices for each partition(md0, md1, > > ...,md4)? > > I'm not entirely sure whether it's possible to > create an uber-RAID > and partition it using the md driver, but separate > md devices works > fine. > > > - Assuming I need one for each partition, what > are > > people's thoughts on skipping / and /boot RAID? > This > > is the most intimidating part from reading the > docs, > > but it would seem to lessen the value of RAID > > considerably. > > There's no reason that / and /boot can't be RAIDed > also. If you put > them on RAID, you'll have to reboot to complete the > transition, but > that's no big deal. > > > - Is the Boot+Root+RAID Howto still accurate, > > particularly for Lilo? > > Never read it. Like I said, the Software-RAID-HOWTO > seems to be > sufficient. > > > There's now a RAID boot option in Lilo which I'm > not > > sure how it would effect things like boot= and > root=. > > Not familiar with this option, but I've used the > procedure above > several times (I've got 3 or 4 systems running > all-RAID) and it works > fine with potato's lilo. I can't imagine that > woody's would have a > problem with it. > > -- > When we reduce our own liberties to stop terrorism, > the terrorists > have already won. - reverius > > Innocence is no protection when governments go bad. > - Tom Swiss > > > -- > To UNSUBSCRIBE, email to > [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact > [EMAIL PROTECTED] > __________________________________________________ Do You Yahoo!? Yahoo! Sports - Coverage of the 2002 Olympic Games http://sports.yahoo.com
