Well, 2 hours to bring up the DR box is stretching things a bit!
Shutdown takes 2 minutes, but that's once the users are kicked off, batch jobs are ended, subsystems are ended, TCP is gently shut down... -then- it's 2 minutes to power down system!
Assuming the shutdown is instantaneous (after all, we're talking an Outage), bringing up the DR box will probably only be 30-45 minutes (we have to sign on to the other HMC &c), but that doesn't include the network side of the house! (;
It's not a true Role Swap, but firing up an alternate system.
Paul E Musselman
PaulMmn@xxxxxxxxxxxxx
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Steinmetz, Paul
Sent: Thursday, March 29, 2018 3:37 PM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxx>
Subject: RE: What is the difference between Flash storage and a Flash Storage system like the V9000/V7000
Paul,
I'm a bit shocked at your IPL times.
My current P7-8205-E6C takes 2 minutes to shutdown, 5 minutes to IPL.
I'm also shocked at your role swap time, 2 hours.
I've had several demos/webexs with various HA vendors, they are all claiming less than 5 minutes role swap time.
I'm still researching the various HA/DR solutions for possible future P9 config, if corporate commits.
The P9 is a definite.
HA/DR, we'll see.
We have a 2nd data center, connected via fiber.
Paul
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Musselman, Paul
Sent: Thursday, March 29, 2018 3:13 PM
To: Midrange Systems Technical Discussion
Subject: RE: What is the difference between Flash storage and a Flash Storage system like the V9000/V7000
The question becomes: How long can the company function without the computer? 1 day? 6 hours? 2 hours (for an IPL of the other box)? 2 minutes?
Then you attach a price tag to each answer, and see when they say 'ouch!' It's an insurance policy.
We have a DR system using dueling iSeries/V9000 configurations. The V9000s keep each other in sync (using Consistency Groups because "Metro Sync" ends up as 'synchronous' instead of 'async' when the buffers fill up). No iASPs. So the copy is a system that needs an IPL to be usable. That's about 2 hours (including futzing around, wringing hands), but that's acceptable to the company.
We can make a flash copy of the DR copy and IPL that for auditing purposes-- showing that the live system lives on the DR box and is usable.
iASP is nice, but where does the iASP live? If it's in the data center and the data center goes out, or the iASP dies, there goes your HA solution. You still need an off-site copy, either on tape or in a 2nd box.
Paul E Musselman
PaulMmn@xxxxxxxxxxxxx
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Oberholtzer
Sent: Thursday, March 29, 2018 2:46 PM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxx>
Subject: RE: What is the difference between Flash storage and a Flash Storage system like the V9000/V7000
We are discussing the difference between and HA system and DR system, the difference being simple. The HA box uses iASP and can do a switch in minutes. The DR solution replicates the entire partition (the target partition is powered off) and in the event of an unplanned switch has to IPL
and recover from an unplanned outage.
A planned switch would be to initiate the switch (use the IBM Rochester services toolkit to make it one command) and the local system powers off, then starts the remote box, and reverses the flow of data. No rebuild.
ALL systems should be fully journaled and that minimizes the Database Consistency since the system simply uses the journals to get everything up.
Done properly an unplanned outage can be recovered from with relative ease and minimal downtime.
Since the SAN is doing the replication that moves that workload off of the Power Systems box saving quite a bit there.
--
Jim Oberholtzer
Agile Technology Architects
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