RE: Changing a RAID configuration - Adding/removing disks

There used to be a restriction that RAID operations for drives on the
same IOA as the load source had to be done in DST. I haven't checked
recently but it is something to be careful about.

Kendall Kinnear
System i5 Architect
Stonebridge
 
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-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Larry Bolhuis
Sent: Wednesday, June 07, 2006 10:10 PM
To: Midrange Systems Technical Discussion
Subject: Re: Changing a RAID configuration - Adding/removing disks

The biggest thing for me is that DST is the only place where you can 
completely remove a drive from an ASP. You can drain it darn near MT 
with i5/OS running but you cannot remove it.

Many disk functions are more efficient in DST because no i5/OS is up 
there moving stuff!

There are other things that cannot be done in SST such as creating 
Device Profiles for LAN consoles.

There are lots of other things that you can only do in DST but most of 
those things are rarely used.

 - Larry

Pete Helgren wrote:

Thanks.

I'm going to ask a dumb question: What is the significant difference 
between DST and SST?  Seems like sometimes I hear them used almost 
interchangeably (e.g. "Use DST or SST to ....")  I used SST to add the

drives to the ASP after they were installed and when I went to try to 
start device parity protection on them, that is when I ran into

trouble.

So, I'll need to be at the console to do this so it will have to wait

a 

few weeks until I am back on site.  But it looks like it is pretty 
straightforward,

I appreciate the help.

Pete


Larry Bolhuis wrote:

  

Pete,

 The new drivers are 70GB vs the original ones at 35GB. (But you knew

that!)  You should be able to start parity on those drives even now

with 

the data on them. They can be in the same ASP, that's not a problem

they 

will just be a different RAID set.

Boot the thing to DST to into Work with Disk Units, then tell it to 
Start Disk Parity.  If it doesn't let you do that with the data still

there then you'll need to remove the new drives from the ASP, then

start 

Parity, then add them back into ASP 1.

 - Larry