Re: Adding Disks to ASP and Parity

[rob@xxxxxxxxx]

Will you be adding them to an existing RAID set?  Do NOT start a 3 drive 
parity set.  Never use less than 4 drives in a parity set.  If you are 
ever tempted to do so, start beating your thumb with a hammer until the 
mood passes.  Several people on this list have had totally unacceptable 
performance with 3 drive parity sets, with IBM claiming ignorance of the 
problem.

STRSST
3. Work with disk units
2. Work with disk configuration
4. Include unit in device parity protection  OR  9. Start device parity 
protection.  With 3 drives, you'd better use 4.
2. Add units to ASPs

>From the help:
All the disk units in a parity set must be the SAME CAPACITY
with a minimum number of either 3 or 4 units, and a maximum 
number up to 18 units (depending upon the type of adapter) 
in the resulting parity set. 

Scratch the "either 3 or" part.

Rob Berendt
-- 
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





"Dave Snyder" <dsnyder@xxxxxxxxxx> 
Sent by: midrange-l-bounces@xxxxxxxxxxxx
03/15/2005 03:36 PM
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Subject
Adding Disks to ASP and Parity






I have three non-configured disk drives installed in the system that I
need to add to my system ASP and also start device parity. How do I do
that?
Dave
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