Server 2019 Hyper-V Replica make HRL files for excluded disks

Question

Have make Hyper-V VM guest and setup replication, there is 5 disks, 3 of them excluded from replica, but as i see on files system there is created HRL files for all disks of VM, even for excluded. After a replication period (5 sec) send difference for 2 disks of replication on replication server, excluded disks HRLs just deleting by system.

System is on SSD drive, on excluded disks placed temp files, it's double write operation on SSD.

On WS2012R2 there is no such problem.

Is there any fix for this?

Answer 1

Hi,
I did a test in my lab and found that only the chosen disks would create the HRL files (only the "test" vhd had HRL).

Please check if the extra HRL files belong to the excluded disks and provide the screenshot.
Also please check if the server is updated to the latest, if not, please update it and check if there's any third-party software running on the server, if yes, please uninstall them and start the VM again.

Thanks for your time!
Best Regards,
Mico Mi

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Answer 2

Only VHost-005c is replicated, VHost-005sc is NOT replicated, but if i copy some big size file on VHost-005sc disk, there will be growing HRL file, and it will be deleted after sync time:

All latest updates installed.
I have try to install a fresh new system - there is same problem (have place in different directories VHDX files):
VHost-001c - replicaed
VHost-001d - excluded
VHost-001e - excluded
All files with growing HRL files.

Answer 3

Maybe magic with Vhost**-**001c in name of VHDX? Can you try same instance with names:
VHost-001c - replicaed
VHost-001d - excluded
VHost-001e - excluded

Answer 4

And can you try copy some big size file on NOT replicated disks and see, does HRL file size is growing?

Answer 5

Hi,
Once the initial replication of a VM is completed, Hyper-V replica will start monitoring the change of each selected virtual hard disk. This is done by mirroring the changes to a HRL file.
You can try to use Resource Monitor and Process Monitor to find the problem area. Using Resource Monitor, you will be able to see which process is making writes to which file which can help you isolate any activity that is not normal. Since Hyper-V Replica tracks all writes, a large temporary file can cause a really large HRL file.
Here is the doc that may be helpful for you:
https://learn.microsoft.com/en-us/virtualization/community/team-blog/2014/20140202-hyper-v-replica-debugging-why-are-very-large-log-files-generated
Since the research that forum can do is limited, if you want to know the root cause, it is suggested to go to open a case in the following link so that a dedicated Support Professional can assist you in a more efficient manner.
https://support.microsoft.com/en-us/gp/customer-service-phone-numbers

Thanks for your time!
Best Regards,
Mico Mi

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