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xTract Delta Copies

  • 1 June 2018
  • 8 replies
  • 2432 views
S
Badge +3
Hi Guys,

I know that xTract do a first copy of the source VM and then the Cut-Over do the delta copy + migration of the VM.

Is there a way to do others incremental copy in the interval of First -> Cut-Over ?
I may have few days between the initial copy and the cut-over during which large amount of data will be added to the VM, and I want to minimize the cut-over time...

Thanks for your help.
Arno.
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Best answer by jlaunier 4 June 2018, 18:17

Hi @Sill_Arno ,

Actually Xtract ships IO changes as tracked via CBT approxiately every 10 minutes or so to the AHV cluster. This is the reason why you may noticed from vCenter that snapshots are taken and deleted every 10 minutes or so.
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8 replies

aluciani
Userlevel 7
Badge +35
Hi @Sill_Arno

Thanks for sharing, maybe @jlaunier can share some insights here. Thanks
J
Rank
Userlevel 3
Badge +11
Hi @Sill_Arno ,

Actually Xtract ships IO changes as tracked via CBT approxiately every 10 minutes or so to the AHV cluster. This is the reason why you may noticed from vCenter that snapshots are taken and deleted every 10 minutes or so.
S
Badge +3
Hi @jlaunier ,

thanks for your valuable answer. It may be great to be able to adjust the value of 10 minutes to whatever we want depending the customer context.

Regards
Arno.
J
Rank
Userlevel 3
Badge +11
@Sill_Arno I agree it is good to adjust this. To provide more details, we actually do this but are taking a conservative approach. We do not go less than 10 minutes because we do not want to create too much overhead on vCenter as we are taking and deleting snapshots. If the time to replicate delta IO takes longer than 10 minutes though, we will automatically adjust the snapshot frequency for that particular VM so that the entire delta IO can be copied in the window between snapshots. So for example if you were migrating between datacenters over a WAN with a small network pipe, we would automatically adjust the frequency accordingly.
S
Badge +3
hello @jlaunier. That's exactly my use case (Wan migration with "low bandwidth"). Thanks for your valuable explanation.
C
Userlevel 3
Will Xtract always let you determine the cutover time? I'm concerned that it may just cutover automatically without it being scheduled...
aluciani
Userlevel 7
Badge +35
@jlaunier you able to share some insights with @cschroeder - Thanks
J
Rank
Userlevel 3
Badge +11
@cschroeder cutovers are always manually initiated. Only the initial data seeding can be scheduled.