Grab your Phillips, it's...
The Latest from The Screwdriver List!
>> RAID 0+1 (aka "RAID 10", although there IS no such thing) is a RAID
>> 0 of a couple of RAID 1 sets. Or a RAID 1 set of a couple of RAID 0s -
>> depending on your viewpoint. You get the improved speeds of RAID 1 and the
>> reliability of RAID 0. At a cost, of course - it takes four drives to RAID
>> 0+1.
Umm.. Nope...
RAID 0+1 and RAID 10 are totally /different/ RAID Configurations, and should not
be confused with each other, since both have different requirements, and provide
different performance and redundancy.
RAID 0+1 = Striping /then/ Mirroring
RAID 10 = Mirroring /with/ Striping
The differences are very subtle, and are best represented in a Diagram:
(Each vertical 'stack' of letters represents a single Hard Disk Drive)
RAID 0+1:
A E A E
B F B F
C G C G
D H D H
STRIPE STRIPE
SET 1 SET 2
| |
+------+------+
|
MIRROR
SET
(RAID 0+1
ARRAY)
RAID 10:
A E A B
B F C D
C G E F
D H G H
MIRROR STRIPE
SET SET
| |
+------+-------+
|
RAID 10
ARRAY
(Apologies for the poor diagrams!)
As you can see, the differences are subtle, but RAID 0+1 and RAID 10 are /very/
different in terms of their performance and redundancy levels - the only
similarity is that both require four Hard Drives to work.
Regards,
Mike Insch - IT Engineer, CCA, DipHE
SFS Creative Business Solutions Ltd - http://www.sfs-creative.co.uk/
Tel: +44 (0) 1224 624 014 Fax: +44 (0) 1224 218 318
*******************************************************************
This Electronic Mail is strictly confidential and is intended
for use by the named recipient only. It may contain information
which is privileged and confidential. If you are not the intended
recipient you must not copy, distribute or disclose it, or take
any action in reliance on it. If you have received this message
in error please notify us immediately by telephone.
*******************************************************************
++++++++++++++++++++++++++++++++++++++++++++
That's all for now from The Screwdriver List
"Red Stripe to Pin 1"
++++++++++++++++++++++++++++++++++++++++++++
