Re: Flash Copy questions

[DrFranken <midrange@xxxxxxxxxxxx>]

I concur strongly with Roberto, DRAID with the maximum number of drives 
participating. It's not the future, it's today, really. if you want to 
allocate two hot hot spares that's acceptable. Note that hot spares in 
DRAID are not physically idle (and thus not participating in I/O) as 
they are with RAID 5 or 6 they are spread out across all drives in the 
DRAID set. DRAID is better in so many ways!

Mirroring is still valid on internal disk of course and yes you can do 
hot spare with Mirroring since i 7.1.

Yes you do IPL only the flash copy and it will take a bit longer. This 
is a perfect spot for the startup job to query the partition number so 
it knows it's not production and doesn't start up jobs it shouldn't!

        - Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 6/15/2018 6:05 PM, Justin Taylor wrote:
> I read the link that was posted earlier, and I think the IPL thing was just a misunderstanding.  The IPL is required for the target LPAR, not the production LPAR.
>
> I'm not up on RAID tech.  My boss has always insisted on mirrored drives, which are no longer an option.
>
>
>
> -----Original Message-----
> From: Roberto José Etcheverry Romero [mailto:yggdrasil.raiker@xxxxxxxxx]
> Sent: Friday, June 15, 2018 12:53 PM
> To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
> Subject: Re: Flash Copy questions
>
> IBM i IS priced by core, not by LPAR, you can have as many as 20 LPAR per core (don't expect much out of 0.05 core LPARs...) FlashCopy should be managed by the HA software that I assume they are trying to sell you into.
> What I don't understand is why, for 12 disks, they want to make 2 RAID sets. AFAIK, from what I've learned in the last two TechU, you ALWAYS use DRAID with as many drives as you can.
> If they want an IPL for the FlashCopy they are most likely not aware of PowerHA and it's PowerHA FlashCopy Toolkit (from LabServices), it might end up being a little expensive if you aren't really going to do HA...
>
> Best Regards,
>
> Roberto
>
> On Fri, Jun 15, 2018 at 2:08 PM, Justin Taylor <JUSTIN@xxxxxxxxxxxxx> wrote:
>
> > The SAN would be a Storwize V5010 SFF.
> >
> > Specifically, they said IBMi/SWMA was priced per active core.  I'm
> > still going to have them confirm.
> >
> >
> >
> >
> > -----Original Message-----
> > From: Musselman, Paul [mailto:pmusselman@xxxxxxxxxxxxxxxx]
> > Sent: Thursday, June 14, 2018 3:27 PM
> > To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
> > Subject: RE: Flash Copy questions
> >
> > Justin--
> >
> > What hardware is being recommended for your external storage??
> >
> > IBMi/SWMA by hardware?  Please double-check!
> >
> > Re: Flash Copy at IPL - This may depend on how your external storage
> > is configured.  I know that with a V7000 or V9000 we can Flash at any time....
> >
> > Re: Flash Copy control LPAR:  We're currently allocating 450 GB in
> > three
> > 150 GB extents.  We're using 56% of that space.  Not much more that
> > the OS/IBMi and the Flash Copy software.  We were running with a lot
> > less (migrated from previous hardware) but needed more space to upgrade to V7R3.
> >
> > Paul E Musselman
> > Sr. Technical Support Analyst
> > North America IT / iSeries Technical Support General Cable Corporation
> >
> >
> > T + 1 859 572 8030
> > M + 1 859 953 3134
> > PMusselman@xxxxxxxxxxxxxxxx
> >
> > General Cable Corporation
> > 4 Tesseneer Drive
> > Highland Heights, KY  41076
> > United States
> > --
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