[mythtv-users] The Bigger... Disk contest, Fall 2007 edition

[Dan Ritter]

On Thu, Oct 18, 2007 at 10:56:36AM -0400, Jay R. Ashworth wrote:
> On Thu, Oct 18, 2007 at 07:29:34AM -0600, Joe Ripley wrote:
> > My system isn't nearly as large (only 1.5 TB), however, I just wanted
> > to mention that you don't need a dedicated drive just for booting when
> > using software RAID.  I usually make my boot drive a RAID1 across all
> > of my installed disks, just to make sure the system can boot in the
> > event of multiple drive failure.
> 
> Booting off a mirror is ok.  I just get hives whnm people tell me their
> boot drive is on a RAID 5.
> 
> "mak[ing] your boot drive a RAID1 across all your disks" implies two
> things I can't get my head around: mirroring more than 2 drives, and
> what I assume is mirroring only single partitions?

Consider 6 320GB disks, each with 3 partitions:

filesystem     disk1   disk2  disk3  disk4  disk5  disk6
/ 20GB         mirror  mirror mirror mirror mirror mirror
swap1 1GB       mirA    mirA                            
swap2 1GB                      mirB   mirB              
swap3 1GB                                    mirC   mirC
/video 299GB   RAID5   RAID5  RAID5  RAID5  RAID5  RAID5
       x5 

Any drive can be booted.
Any drive can fail and the system can continue without data loss
Most two-drive combos can fail (not 1&2, 3&4, 5&6) and only
 video will be lost.

It's not unreasonable.

-dsr-

-- 
Every time you give up a right, the terrorists win.
Tyranny is something that creeps up on you.

http://tao.merseine.nu:81/~dsr/eula.html is hereby incorporated by reference.