Compression support for Continuous Replication

[olivierlambert]

@johnelse is currently working on adding compression support in VDI.export operation. Historically, only VM.export had it.

This is presented as an extra parameter in the URL, like for VM.export, using &use_compression=gzip or &use_compression=zstd. In the CR job, we should:

• enable compression choice (like in backup/DR view)
• call the URL with the right compression parameter

Note: right now, compression will be only available on XCP-ng, until Citrix decides to use it or not. Apply the same UI warnings we did for backup/DR, but this time for any compression used (no compression support on XenServer for now)

[julien-f]

This implementation will first be incompatible with delta backup.

This will be fixed by #3944

[Arraylistlistlist]

Is there an ETA for this?

[olivierlambert]

Not at all. We are investigating other means of export than VHD before anything else.