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J.H.Im

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May 16th, 2024 01:26

Question regarding volumes and snapshots when setting up replication with PowerFlex RCG.

Hello, I have questions about the behavior when setting up replication using RCG in PowerFlex.

1. when I add a volume pair to RCG, do the original and replica volumes have the same name?

2. How are the volumeClasses of the original and replicated volumes set?

3. if the source and replicated volumes have the same volumeId, why do I need to enter the same id value when adding a ReplicationPair, when according to the API documentation, there is a sourceVolumeId and a destinationVolumeId? (link)

4. The documentation says that the number of volumes maintained within an RCG is limited to 1024. If a snapshot of a volume bound to an RCG is added, I am wondering if (1) the snapshot is included in that RCG and therefore affected by the limit, (2) the snapshot is not replicated, or (3) if the snapshot is replicated, is it not affected by the limit?

I would appreciate if you could answer my long question.

Thank you.

DELL-Josh Cr

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8.5K Posts

May 16th, 2024 16:24

Hi,

Thanks for your question.

This might help. https://dell.to/3wCZ129

The names don’t need to be the same, you can specify the target name. snapshots shouldn’t count against the volume limit.

Let us know if you have any additional questions.

J.H.Im

1 Rookie

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8 Posts

17-05-2024 01:03 AM

Thanks, @DELL-Josh Cr​ .

Thank you for your answer.
I have a couple more questions that I'm not sure I understand yet.

1. if the source and replicated volumes have the same volumeId, why do I need to enter the same id value when adding a ReplicationPair, when according to the API documentation, there is a sourceVolumeId and a destinationVolumeId? (link)

2. Is there any property that can distinguish a replicated volume when only its volume object is referenced by REST API? I am wondering if the three cases below can be distinguished by properties of the volume object.
  - Non-replicated volume
  - Source volume included in an RCG
  - Target volume included in an RCG

3. what steps do I need to take API-wise to add or remove additional volumes to an active RCG? What manipulations do I need to make to the RCG or Replication pair, volumes, etc.

4. are snapshots of a replicated volume also replicated and included in the RCG it belongs to?

5. can I add a volume to multiple RCGs? If I do this to configure one-to-many, which one will be the source volume in case of failover? (link)

Thank you for your kind response.


J.H.Im

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8 Posts

17-05-2024 01:07 AM

Sorry, I have one more question..

I understand that the volumes don't have to be named the same, but is it possible to make them the same as each other?

DELL-Josh Cr

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8.5K Posts

17-05-2024 12:33 PM

It should work fine if they are the same name. 

Thanks,

Josh

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J.H.Im

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20-05-2024 01:20 AM

DELL-Josh Cr

Moderator

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8.5K Posts

20-05-2024 13:08 PM

  1. I am not sure why they designed the command that way.
  2. I don’t see a way to do it with just volume info. You have to use replication commands. https://dell.to/4dO25cl
  3. I don’t see a way to add more volumes to an existing RCG https://dell.to/3V6xCio
  4. Snapshots should be included.
  5. No, a volume can only be part of a single RCG. https://dell.to/4bLAeaY

Thanks,

Josh

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