mourik jan heupink - merit wrote: > Bob Proulx wrote: > > When I set up a system such as this I always test afterward that the > > system can be booted from each disk individually. Don't boot past > > grub. Just boot to grub to verify. If you boot past grub into a > > degraded raid system it will create a "split brain" problem with each > > disk thinking it is newer and requiring the raid to be rebuilt > > manually. > > Or simply change boot priority of the harddisks in the bios? That way you > should be able to fully boot the system from both disks. Not quite. It is possible that the boot sector on one disk points to the system on the other disk in a criss-cross way. In that case both disks are required for boot. Swapping the drives in the bios may not catch that type of problem because both are still online in the reversed order. Very annoying to find that out later. I say this because I have had the misfortune to find that out later in just such circumstance. The debian-installer in rescue mode works well to recover from such problems. We were talking Supermicro servers. All of mine have hot swappable drive bays. (Because I avoid the non-hot-swappable ones. I know there are a lot of those too.) With hot swap drive bays it is easier to grab the red handle and pull the drive part way out of the bay to disconnect it. (Leave it in the bay and let it spin down.) Then you are assured of the disk isolation. Bob
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