Re: Converting RAID Striping from 4Disks to 8Disks

["Al Barsa Jr." <barsa2@xxxxxxx>]

At 03:14 PM 6/8/98 -0400, you wrote:
>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?????

This is not done by command.  You need to end parity protection in DST, and
restart it.   This will give you the optimal protection with the least
usage of parity disks.  Alternatively add the drives two at a time, but
this might take longer.

Al


Al Barsa, Jr.
Barsa Consulting, LLC.

(914) 251-9400
(914) 251-9406 (fax)

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