What are the priority counts to migrate the VMs under DRS

Need to understand if any difference made with DRS mechanism in 4.x and 5.x and 5.5 ?
 Which technology is used under DRS ?

How VMs are setting priority by default to migrate form one host to other or from one datastore to other ?
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patronAsked:
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patronAuthor Commented:
How actually VMotion works ?
  port number used ?
  Prerequisites for VMotion ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
vMotion is the underlying technology used for VMware vSphere DRS.

I would start reading the King of DRS and HA - here

By Duncan Epping and Frank Denneman

http://www.yellow-bricks.com/vmware-high-availability-deepdiv/

VMware vSphere 4.1 HA and DRS Technical deepdive (Volume 1)

By Duncan Epping and Frank Denneman

(http://www.yellow-bricks.com/vmware-high-availability-deepdiv/)

ISBN-10: 1456301446
ISBN-13: 978-1456301446

Written by Duncan Epping and Frank Denneman, both of whom are Consulting Architects at VMware and are perceived by the industry as Subject Matter experts on VMware High Availability and VMware Distributed Resource Scheduler.
This book zooms in on two key components of every VMware based infrastructure. It covers the basic steps needed to create a VMware HA and DRS cluster, and goes on to explain the concepts and mechanisms behind HA and DRS which will enable you to make well educated decisions. You will get the tools to understand and implement e.g. HA admission control policies, DRS resource pools and resource allocation settings and more.

On Amazon US

[Paperback]

http://www.amazon.com/gp/product/1456301446?ie=UTF8&tag=yellowbricks20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1456301446

[ebook]

http://www.amazon.com/dp/B004V49JGW/ref=as_li_tf_til?tag=yellowbricks20&camp=0&creative=0&linkCode=as1&creativeASIN=B004V49JGW&adid=0ED4RKK85G6ZTGTH9ENP

on Amazon UK


[Paperback]

http://www.amazon.co.uk/Vmware-Vsphere-4-1-Technical-Deepdive/dp/1456301446/ref=sr_1_2ie=UTF8&s=books&qid=1305637596&sr=8-2


[ebook]

http://www.amazon.co.uk/VMware-vSphere-4-1-technical-deepdive/dp/B004V49JGW/ref=sr_1_1?ie=UTF8&s=digitaltext&qid=1305637596&sr=8-1

Available in Europe from

http://www.comcol.nl/detail/73133.htm

DRS - moves VMs from host to host in a Cluster.

Storage DRS - moves VMs from datastore to datastore in a Storage Cluster.

You can change how aggressive DRS is, from manual to aggressive.

All VMs have the same priority, unless they have a anti-affinity affinity rule created.

DRS can be set to manual, partial, or fully automated, these settings can apply to ALL the VMs, or it can be individual set per VM.
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patronAuthor Commented:
Grate Thanks..if i put one host in maintenance mode..so it ll start moving 200 vms form this host to others in cluster ?

so need to understand how priority ll be counted here..and how many vms ll be migrated @time ?

 if there is no rule configured in drs..how drs ll take vms for migration ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Grate Thanks..if i put one host in maintenance mode..so it ll start moving 200 vms form this host to others in cluster ?

Yes.

so need to understand how priority ll be counted here..and how many vms ll be migrated @time ?

all will be moved. As for in which order, depends in the priority, but all will be moved quickly off the host, you can expect them to be moved within 2-3 minutes, Depending upon vMotion interfaces.

if there is no rule configured in drs..how drs ll take vms for migration ?

Manual, Partial, and Fully Automatic.
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patronAuthor Commented:
Thanks..but my queary was to understand..if we ignore all setting done @HA and DRS..how priorty ll be count for vms migation..if am moving 30 vm form my one host to other in cluster?

and no rule configured ..for any VM?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if you do not change anything the defaults will apply.

based on load across the servers (CPU and Memory).
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patronAuthor Commented:
Thanks a lot..indeed i was looking for some detail view to look more into mechanism ..how individual vms are selected for migration
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