Re: Mirroring on i5/OS

[Wayne McAlpine <wayne.mcalpine@xxxxxxxxxxxxxxxxx>]

If you add a pair of disks to the mirrored storage pool, they will 
automatically be mirrored.  It has its own algorithms to figure out the 
most effective mirroring configuration, i.e., bus level, controller 
level, or disk level.

Pete Helgren wrote:
> What is throwing me is whether I need to add the non-configured disks to 
> the pool first and then implement the mirroring or start mirroring and 
> indicate that I want the non-configured units to be the mirrors.  Seems 
> like a chicken or egg thing: If I add the non-configured units to the 
> asp, they won't be available to be the mirrored pair (I think).
>
> With raid 5 you just add the units to the asp and tell it to start RAID 
> protection and it all seems to work.  With mirroring, I not sure how to 
> tell the configuration tool that the non-configured units are the ones I 
> want to be mirrors.  Even in iSeries Navigator, it isn't clear.  I guess 
> I'll try adding the non-configured units and then see if I can start 
> mirroring after they are added to the pool.
>
> Otherwise, I'll try Pete's approach and see what my options are at IPL 
> time.
>
> Thanks
>
> Pete
>
>
> Wayne McAlpine wrote:
> > I believe you can also do it from iseries Navigator. Click on 
> > Disks-->Disk Pools-->right click on the pool to mirror and take the 
> > option to start mirroring.
> >
> > Pete Massiello wrote:
> >  
> > > Pete,
> > >
> > >     Try booting up in Manual mode and go into DST and WORK WITH DISK
> > > Configuration.  From there you will see what you need.
> > >
> > > Pete
> > >
> > > Pete Massiello
> > > iTech Solutions
> > > http://www.itechsol.com
> > >
> > > -----Original Message-----
> > > From: midrange-l-bounces@xxxxxxxxxxxx
> > > [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Pete Helgren
> > > Sent: Wednesday, November 12, 2008 1:52 PM
> > > To: Midrange Systems Technical Discussion
> > > Subject: Mirroring on i5/OS
> > >
> > > I thought this would be easy but I must be a little slow this week...
> > >
> > > I have my JS12 configured with 4 drives allocated to i5/OS (More 
> > > accurately I have VIOS allocating 4 drives to the JS12 from the 6 
> > > available in the BCS).  Two of which I have configured as part of  
> > > ASP1.  All is well. However, I'd like to get some protection on these 
> > > drives and my understanding was that mirroring is my only option.  
> > > So, how to I achieve that ?  Disk hardware status shows this:
> > >
> > >           Serial                     Resource      Hardware  ASP 
> > > Unit  Number          Type Model Name          Status      1    1  
> > > YWEB5KZWKZRX    6B22  050  DD004         Operational
> > >   1    2  Y9EJAR7L8YMZ    6B22  050  DD003         Operational
> > >           Y384SV9UX3VE    6B22  050  DD001         Operational
> > >           YJA2X8PBPAUR    6B22  050  DD002         Operational
> > >
> > > So, as far as I understand it, the two drives that are unallocated 
> > > could be used to mirror the other drives but I don't see any option 
> > > in SST to use these drives in a mirrored arrangement.  Work with 
> > > Device Parity protection show the following menu:
> > >
> > > 1. Display disk configuration 2. Include unit in device parity 
> > > protection              3. Start device parity protection - RAID 
> > > 5               4. Start device parity protection - RAID 
> > > 6               5. Start device parity protection - RAID 5 with hot 
> > > spare
> > > 6. Start device parity protection - RAID 6 with hot spare
> > > 7. Select parity optimization                           
> > > No mention of mirroring.....
> > >
> > > So, how do I mirror these things? I get plenty of hits on mirroring 
> > > "Concepts" in the infocenter but precious little about 
> > > implementation.  Running IBM i 6.1 on a JS12.
> > >
> > > Pete
> > >
> > >
> > >
> > >