Wednesday, March 28, 2018

WFA sub-workflow runner template (parallel workflows)

Invoking a workflow in a workflow.  It's been done before.  Of course we can have subworkflows (1 level deep).
But I'm talking about invoking a loop-back (localhost) rest-call.

When done in the traditional way, usually for something simple like the default "acquire datasource" workflow, it's something like : invoke-rest - wait - check result.

Maybe even with a repeat-row, like Tim Kleingeld did with his lun migrations a few years back.

If we mean serious business, we need something more solid, more thought-through.

WFA handling passwords as userinput

Although WFA has a credential repository, sometimes it is still needed to prompt an operator for a password.

In that case, it's best it is protected and no-where to be found in the logs.

WFA has this feature and here is a step-by-step tutorial on how it works.

Monday, March 26, 2018

Run PowerShell scripts in parallel

PowerShell is awesome, and you can do many things with it.  But a PowerShell script is run synchronously.  That means that it will just execute one line after the other.  For many purposes, that's just fine.  However, if you want to process thousands of objects, latency issue might kick in.

For example : you want to collect information from a 1000 servers and the script runs for 2 minutes per server, then your script will run for more than a day.

If we could however process multiple servers at the same time, that would drastically reduce the overall process time.

In this example I'm processing and merging more than a 1000 csv files into 1 csv-file (All that in a few seconds, and I have manually added a fake latency of half a second per csv-file !

Thursday, March 15, 2018

Error : Parameter Type 'ActionPreference' is not supported.

If you create a new command and you press the button "discover parameters", you might get the error "Parameter Type 'ActionPreference' is not supported".

Don't panic, there is an easy fix.

Thursday, March 1, 2018

Convert ALL snapmirror DP relations to XDP with WFA

I was asked to automate the conversion of all snapmirror relations from DP to XDP.
So here is a workflow (version 4.1) that should work as an example.

It asks for the new mirror-vault snapmirror policy name and lists your snapmirror relations (all of them)