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Re: RAID 5 questions (software)

On Thu, Jul 07, 2005 at 10:53:34AM -0500, Michael Martinell wrote:
> I have been experiementing with the RAID stuff in Debian 3.1r0a
> In this experiment I configured as follows:
> 1st Hard Drive
> /boot 400mb
> swap 2GB
> partition for Raid volume 37 GB
> 2nd - 4th HD
> partition for Raid volume 37 GB.


> If the first hard drive crashes how do you recover?

You restore from backups or do a new install.

> I pulled it out, put
> in a brand new drive, inserted my boot floppy, and of course had no kernel
> to boot.  Is there a way to set it up so that I could have a back up boot
> sector on the other hard drives?  On a regular hardware raid system I
> would have set up raid 1 for my boot disks and raid 5 for my data disks. 
> Since I am limited to just 4 hard drives I obviously can't do that here. 


Put a partition for /boot, swap and RAID5 on every disk then do
RAID1 across the /boot and swap partitions.  A 4-way mirror is a bit
excessive so you could just put /boot on two of them and swap on
another two.

As long as the partitions you want to put into a RAID1 or RAID5 are
the same size there will be no issues with Linux software RAID.

Also consider RAID10 rather than RAID5 if you can spare the disk
space; it has better performance and better redundancy.

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