Re: possibly silly question (raid failover)

[Miles Fidelman <mfidelman@meetinghouse.net>]

David Brown wrote:
>
> No, md RAID10 does /not/ offer more redundancy than RAID1.  You are 
> right that md RAID10 offers more than RAID1 (or traditional RAID0 over 
> RAID1 sets) - but it is a convenience and performance benefit, not a 
> redundancy benefit.  In particular, it lets you build RAID10 from any 
> number of disks, not just two.  And it lets you stripe over all disks, 
> improving performance for some loads (though not /all/ loads - if you 
> have lots of concurrent small reads, you may be faster using plain 
> RAID1).

wasn't suggesting that it does - just that it does things differently 
than normal raid 1+0 - for example, by doing mirroring and striping as a 
unitary operation, it works across odd number of drives - it also (I 
think) allows for more than 2 copies of a block (not completely clear 
how many copies of a block would be made if you specified a 16 drive 
array) - sort of what I'm wondering here





-- 
In theory, there is no difference between theory and practice.
In<fnord>  practice, there is.   .... Yogi Berra