Re: PowerHA for IBMi

There are indeed a million ways to muck this up. I know well of a company in SFO that has two MASSIVE stacks of linux boxes supporting MySQL in 26 shards. 100% SSD, millions of transactions per hour. The two stacks mirror each other. Never supposed to be down they say. Awesome. Then somebody does a dumb thing and they switch to the backup server. Then they delete a table on what was thought now to be the backup server BUT somehow that delete replicates to current production. No matter it was just the customer file. (SSDs delete real fast.)

There was no hardware failure or data center failure whatever. Just people reacting incorrectly to an oopsie.

To err is human, to really muck it up takes a computer.

- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 10/21/2014 2:11 PM, Nathan Andelin wrote:

So, is there ANY solution on the market that can perform a HOT SWAP of
IBMi in the event of a crash?

What do you mean by a crash? A catastrophic event that destroys a data
center in an instant? It appears to me that 99% of "crashes" are disk drive
failures, 99% of which may be mitigated by disk mirroring.

So 99.9% of outages can be planned hot-swaps.

Some folks advocate moving applications off centralized servers to server
farms managed by load balancers, so that a complete failure of a single
application server doesn't materially affect overall data center
operations. But an entire server farm can be taken down by a failure of a
single database server.

Nathan.