From: Brown, Larry <Larry.Brown@NielsenMedia.com> - 2006-06-19 16:54:41
OK, I'm going to ask a stupid question. I'm sure I must have run across
this in the past but can't find any mention of it now...
Is it possible to allow a small group of nodes to boot to an init node
where the init node is still running off initrd, mount their disks with
software raid, and pivot root over to them allowing the root filesystem
to be fault tolerant with software raid 5?
If you want the root to be fault tolerant, a standard debian
installation allows this (Sarge 3.1).
We partition each drive with a small boot partition (~50MB) , some swap
space (1GB) and the rest being allocated for RAID.
The installer is told that the first drive, first partition is mounted
as boot, the other primary partitions on the other drives are not
designated to be mounted (the debian installer can't have more than one
drive mounted to the boot point).
The installer allows the creation of the raid, and we flag that as
mounting as the root filesystem -- it gives us a very large software
raid, and on the faster processors can actually give better performance
than hardware raids. The boot partition never changes (unless we
upgrade the kernel) and is small enough so we use dd to copy it over to
the other unused partitions so all the drives are now bootable.
Brown, Larry wrote:
> OK, I'm going to ask a stupid question. I'm sure I must have run across
> this in the past but can't find any mention of it now...
> Is it possible to allow a small group of nodes to boot to an init node
> where the init node is still running off initrd, mount their disks with
> software raid, and pivot root over to them allowing the root filesystem
> to be fault tolerant with software raid 5?
> Larry Brown
> Ssic-linux-users mailing list
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