Re: 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
>
>
>
>
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