Re: Flash Copy questions

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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