ESXi 5.1 Update 3 Storage vMotion RDM Options

compdigit44
compdigit44 used Ask the Experts™
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I have a Windows 2008 R2 VM that has an RDM mapping. It used to be part of cluster but is now a stand-alone (long story). Anyway I have to "move" the Vm to a new IBM XIV. Here are my questions.

1) Know know when you storage vmotion a RDM the point file is updated and data is not moved of course. If our XIV's are not replicating what is the best way to move the LUN on the back end.

2) What is required to convert the RDM to a VMDK? This is a critical VM do our downtime windows are very small
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
Physical or Virtual mode RDM ?

this makes a difference to your options.

Author

Commented:
IT is in physical mode since it use to be part of a MS Failover cluster.
Top Expert 2015

Commented:
Just a disk image copy with all VMs involved powered off.
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Author

Commented:
Disk image copy using vmfstools or Converter? We have a small downtime window

Author

Commented:
How could the data be moved in the back end between SAN's with out replication?
Top Expert 2015

Commented:
In your dreams. You built it that way that you have SINGLE POINT OF FAILURE - untouchable RDM. Now you have the downtime.

Author

Commented:
UNfortuently I did not build it and cleaning up bad choices from my coworkers...Looks like moving the LUN on the backend or using convert will need downtime.
Top Expert 2015

Commented:
Yes, it will need the downtime. The bigger the LUN the longer.

Author

Commented:
ouch... thanks again... :o)
Top Expert 2015

Commented:
If t is cluster quorum you can make another quorum and disconnect old from machines on reboots.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
Well if it's physical, you can only migrate RDM to VMDK, when the VM is OFF.

So other options....

Converter or Double Take MOVE to do the Migration with zero downtime.

Converter with Sync Mode....

how much downtime can you cope with 60 minutes  or 2 minutes

Author

Commented:
The Vm is not longer in a cluster to a quorum drive is not needed. The RDM is 600GB and was planning to use converter.

Any way for me to run this live on teh VM the and do the final sync powered off?
Top Expert 2015

Commented:
600GB at 50MB/s = 3.5h if that 600GB is on a single physical disk.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
No the Sync via Converter, must be done whilst ON, and the final sync ON.

Author

Commented:
Ok so I had it reverse ... this might work... this mean the final down time would me minimal and need to read up on this since I have not done it before with a RDM.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
V2V, P2V same with a RDM as any other server.

see my EE Article

HOW TO:  Synchronize changes when completing a P2V or V2V with VMware vCenter Converter Standalone 5.1

it's simple really.....

Start your V2V......this can take as long as it likes.

when your first sync has been done, publish and get your Outage Scheduled, I would recommend a window of 2 hours. (1 hour to stop the service, 1 hour for final tweaks and return to service).

Depending when you know, the date of your Outage, Perform a Manual Sync every day.

1 hour before the published 2 hour Windows perform another sync......

then shutdown all services, shares, etc networking on the server...

perform a FINAL SYNC.

Shutdown Old VM.

complete modifications on new VM, IP Address etc, and then start....

Simple, 2 hour outage....and you do not have to worry about how long it takes to replicate, and it's done in background,, with little impact on server.

Author

Commented:
I am reading your article indetail now and will let you know if I have any questions. I planned I testing this on a test VM first... The only thing I will not be able to do ahead of time is install the convert software on the product VM due to our strict change control process so I will have to run it from a remote server running converter.
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
not sure in terms of change control what is the difference here, because both will change the VM, e.g. install software on the VM to be converted.

As long as you have a back-out plan.....e.g. rollback, before software was installed should satisfy most change boards, we've been involved with!

Author

Commented:
I am running converter 5.0.1 which is what we already have installed on our vcenter server and selecting virtual infrastructure after I login and select my VM I get the message "cannot convert a powered on machine"
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
Someone not reading my articles......tut tut!

VMware Converter, best practice and recommended install on the VM to be converted.....

Author

Commented:
I did read the article but cannot install it on the source VM becuase of our change control process
VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017
Commented:
You will not be able to convert then! Unless Change Control Process approves the change!

as for network conversion, remote or other, they will all install an agent, and hence require change control.

and any change of VM in Production should be under change control, not matter, what you Admins do to it!

Author

Commented:
thank for your your guidance as always Hancock!!!!

I learned something new..
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization Consultant
Fellow 2018
Expert of the Year 2017

Commented:
No problems, if you have a budget, you may want to consider Double Take MOVE for $300 or a one time move.

Better than Converter, and less downtime.

(still installs an agent though!)

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