| Wayne Dawson on Mon, 17 Mar 2003 12:54:42 -0500 |
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On Wed, Mar 12, 2003 at 12:19:21PM -0800, Wayne Dawson wrote: > Ok, some time ago I asked how I should arrange my partitions on RAID. > > Well now I'm asking how to actually move a partition onto RAID. > > I can unmount /var so I figured I'd try to put it onto my /dev/md0 device > which I created via "mdadm -C" from /dev/sda1 and /dev/sdb1. > > I've tried some things, but maybe I should just back up and ask: how do I > do it? At 11:07 AM 3/13/03 -0500, you wrote: Well I just moved root to raid1 on my 1u server last night. Created the /dev/md0 , formated it reiserfs then just did a cp -ax / /mnt/newroot Course I always keep around some spare space to allow me to move stuff around. Well, once I got to a point where I could see /dev/md0, I figured it acted like a physical hard disk which I could create partitions on via fdisk. It didn't work. After (apparently) successfully creating a partition with fdisk (/dev/md0p1), if I try to mount it, the mount command generates this error: mount: special device /dev/md0p1 does not exist Certainly I can just copy everything from a single partition (/ for example) over to the mounted raid, but what I need to do is put multiple partitions onto it. What I have now is: Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda5 505605 179305 300196 38% / /dev/hda1 101089 17580 78290 19% /boot /dev/hda3 7337124 32876 6931540 1% /home none 127176 0 127176 0% /dev/shm /dev/hda2 20050176 3972764 15058892 21% /usr /dev/hda6 1027768 168644 806916 18% /var /dev/md0 17639128 32836 16710276 1% /mnt/softraid What I want to do is take all these partitions (or as much as possible, excluding /dev/md0 itself of course) and place them on the /dev/md0 device so that I can boot and run the system from there. I did notice one thing which, to me, seems rather bizarre. After assembling /dev/md0 from /dev/sda1 and /dev/sdb1 (using "mdadm -As /dev/md0"), I noticed that I can mount all three at the same time, and then access them separately. All 3 of them show a file blah/test, which I created when only /dev/md0 was mounted directly. Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda5 505605 213759 265742 45% / /dev/hda1 101089 22484 73386 24% /boot /dev/hda3 7337124 34592 6929824 1% /home none 126940 0 126940 0% /dev/shm /dev/hda2 20050176 4066548 14965108 22% /usr /dev/hda6 1027768 183056 792504 19% /var /dev/md0 17639128 32836 16710276 1% /mnt/softraid /dev/sda1 17639128 32836 16710276 1% /mnt/sda1 /dev/sdb1 17639128 32836 16710276 1% /mnt/sdb1 So I tried creating a file /mnt/softraid/blah/test2 to see if it showed up on /mnt/sda1/blah/test2 and /mnt/sdb1/blah/test2. It did not - that is, until I unmount/remounted /dev/sda1. It's now visible at /mnt/sda1/blah/test2, but /dev/sdb1 doesn't show it even after unmounting/remounting. I don't understand this behavior, but the critical thing here is to get this system running with as much as possible on the raid. Can anybody tell me what I need to do? Thanks, Wayne _________________________________________________________________________ Philadelphia Linux Users Group -- http://www.phillylinux.org Announcements - http://lists.netisland.net/mailman/listinfo/plug-announce General Discussion -- http://lists.netisland.net/mailman/listinfo/plug
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