Les Mikesell wrote: > Ruslan Sivak wrote: >> Interesting thing... I build the following set up: >> >> /boot on raid1 >> swap on raid0 > > Swap on raid1 has a chance of working through a drive failure. Raid0 > doesn't. > >> / on raid6 > > Does the installer do that? > >> /data on 2 lvm raid1's. > > If you are going to use LVM you don't have to match your partitions > across all 4 drives. Put /boot, swap, / on raid1 on the 1st 2 drives > with another raid1 for the rest of the space. Then make a raid1 using > partitions that fill your 3rd and 4th drive and combine the two large > raid1's in LVM. That leaves it so you can expand if you want to add > more drives. > >> I shut down and plucked out one of the drives (3rd one I believe). >> Booted back up, everything was fine. Even swap (I think). I, >> rebooted, put in the old drive, hot added the partitions and >> everything rebuilt beautifully. (again not sure about swap). >> >> I decided to run one more test. I plucked out the first (boot) >> drive. Upon reboot, I got greeted by GRUB all over the screen. Upon >> booting into rescue mode, it couldn't find any partitions. I was >> able to mount boot, and it let me recreate the raid1 partitions, but >> no luck with raid6. This is the second time that this has happened. >> Am I doing' something wrong? Seems when I pluck out the first drive, >> the drive letters shift (since sda is missing, sdb becomes sda, sdc >> becomes sdb and sdd becomes sdc). > > The only thing that should care about about this is grub. Everything > else should autodetect. > >> What's the proper repair method for a raid6 in this case? Or should >> I just avoid raid6, and put / on 2 an LVM of 2 raid1's? > > I'd put / on one raid1 with no LVM. Call that raid1 #0. Put the rest of disk1 & 2 into raid1 #1 , put all of disk 3 & 4 into raid1 #2 , put raid1 #1 & raid1 #2 into LVM. So your LVM size should be something less than (2 * disk) - OS, everything mirrored. > And personally, I'd do the same with the rest of the space and deal > with the extra partition by mounting it somewhere. LVM avoids the > need for that, but at the expense of no longer being able to recover > data from any single drive. > -- Toby Bluhm Midwest Instruments Inc. 30825 Aurora Road Suite 100 Solon Ohio 44139 440-424-2250