RE: Converting RAID Striping from 4Disks to 8Disks

Larry,

I believe you need to go into Dedicated Service Tools during Manual IPL
and Work With Disk Configuration.
Obviously can't do that right now, but the 'switch' should be a DST
option when working with Disk ASP.
Not sure what manual it's in - possibly Backup & Recovery.


Neil Palmer                                AS/400~~~~~      
NxTrend Technology - Canada   ____________          ___  ~     
Thornhill, Ontario,  Canada   |OOOOOOOOOO| ________  o|__||=   
Phone: (905) 731-9000  x238   |__________|_|______|_|______)   
Cell.: (416) 565-1682  x238    oo      oo   oo  oo   OOOo=o\   
Fax:   (905) 731-9202       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
mailto:NPalmer@NxTrend.com    AS/400  The Ultimate Business Server      
http://www.NxTrend.com

> -----Original Message-----
> From: Larry Bolhuis [SMTP:lbolhui@ibm.net]
> Sent: Monday, June 08, 1998 3:14 PM
> To:   MIDRANGE-L@midrange.com
> Subject:      Converting RAID Striping from 4Disks to 8Disks
> 
> All,
> 
>   As most of you familiar with the RAID-5 implementation on the AS/400
> are aware, the RAID striping can be across 4 disks or 8 disks.  Use of
> 8
> disk striping can improve performance especially when one unit has
> failed.  Of course it is not always possible to have sets of 8
> especially when less than 8 drives were initially available.
> 
>   In the AS/400 Advanced Series handbook (GA19-5486-13) on page 63 the
> third paragraph begins:  "To convert the parity striping from four
> disk
> units to eight, it is a simple command in OS/400."  On page 114 it
> states it just slightly differently: "...it is a simple software
> switch
> command..."
> 
>   The 64bit question is:  What is that Command?????
> 
>   As far as I know the entire raid set must be removed from the
> configuration and re-added in order to accomplish this. PLEASE prove
> me
> wrong!
> 
>   Larry Bolhuis
>   Arbor Solutions, Inc
>   lbolhui@ibm.net
> 
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