• Subject: RE: DASD - Raid / Mirror Config.
  • From: Chris Cole <ChrisC@xxxxxxxxxxx>
  • Date: Wed, 13 Oct 1999 16:19:13 +0100

The S20 in question has a #2741 installed which is RAID capable for the all
disks, including load source.  I know as I configured it.  Set device parity
for the whole set Nick.  This will give you 72GB usable DASD.  If you want
to set 2 RAID arrays (ie 2 parity sets of 5 disks), you will have extra
protection but lose an additional 8GB capacity ie 64GB usable.

Contact me offline if you like.

Regards

Chris Cole    

-----Original Message-----
From: Al Barsa, Jr. [mailto:barsa2@ibm.net]
Sent: 13 October 1999 17:36
To: MIDRANGE-L@midrange.com
Subject: Re: DASD - Raid / Mirror Config.


At 09:59 PM 10/12/1999 +0100, you wrote:

The initial implementation of RAID-5 did not permit RAID support of the 
MFIOP (which contains the load source), so you had to mirror the 
MFIOP.  With the generation of hardware that included the S20 (which was 
the 600 series), you could put RAID on the MFIOP.

I am unsure if you had to purchase a special controller.

Al


>Hi,
>
>Quick question...... I have a model s20 with V4R2.
>
>I have 10 x 8Gb drives and what to enable RAID, On my other machines, and
>historically I always mirrored the load source disk, or at least I did
under
>V3R7.
>
>I took the option from DST to start mirroring, but I cant see where I tell
>it to only mirror unit 1 onto 2.
>
>In addition, I have started raid, and it is looking at all 10 disks
>including the load source.
>
>1. Can you raid protect you load source ?
>2. If so, is this new with 4.2 ?
>3. If not, then what am I missing re the mirroring of the load source ?.
>
>I have looked in the V4R2 Backup & Recovery, but what to confirm.
>
>Many thanks
>Nick
>
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