incremental backup takes nearly 24 hours

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Contributions: 13
Commentaires: 20

Hi,

we have a VM on hyper-v where an incremental backup takes 22-24 hours.
The size of the VM is approx. 1 TB and only about 25 GB are changed between incremental backups.
A full backup of this VM only takes about 1 hour.

Backups are done agent-less (hyper-v agent) over 10 Gbit/s LAN.
Incremental backups of all other VMs are very fast (also big VMs).

There are no error messages I can see.
The backup seems fine once it it finished.

Here is an excerpt of service process log:

-----------------------------------------
2017-10-14T00:34:43:736+01:00 11496 I0135003A: Der Benutzer '' (clientProfileID=; clientSessionID=F34CD980-ACE1-4AA1-8E96-AD3B58D3E743) führt gerade den Befehl 'Die Laufwerke der virtuellen Maschine werden gesichert' aus.
2017-10-14T00:34:43:742+01:00 11496 I000101F8: Ausstehende Aktion 162 wurde gestartet: 'Partitionsstruktur sichern (Laufwerk 1)'.
2017-10-14T00:34:43:761+01:00 11496 I000101F8: Ausstehende Aktion 162 wurde gestartet: 'Partitionsstruktur sichern (Laufwerk 2)'.
2017-10-14T00:34:43:766+01:00 11496 I000101F8: Ausstehende Aktion 162 wurde gestartet: 'Partitionsstruktur sichern (Laufwerk 3)'.
2017-10-14T00:34:43:775+01:00 11496 I000101F8: Ausstehende Aktion 165 wurde gestartet: 'Partitionsabbild erstellen (System (C))'.
2017-10-14T22:14:25:652+01:00 11496 I000101F8: Ausstehende Aktion 165 wurde gestartet: 'Partitionsabbild erstellen (File (D))'.
2017-10-14T22:46:00:818+01:00 11496 I000101F8: Ausstehende Aktion 165 wurde gestartet: 'Partitionsabbild erstellen (SQL (E))'.
2017-10-14T23:10:33:925+01:00 11496 I0135003B: Befehl 'Die Laufwerke der virtuellen Maschine werden gesichert' wurde erfolgreich abgeschlossen.
-----------------------------------------

How can we speed this up?

Regards
Dennis
 

sam 14/10/2017 - 21:22
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Contributions: 22
Commentaires: 3800

Hi Dennis,

Such issues should be investigated separately with help from our support team. Since the problem affects only one specific VM, then details about it should be discovered. It could be broken RCT record for the VM (if it's Hyper-V 2016) which therefore returns invalid information about changed sectors from Hyper-V, or it could be specifics of the partition structure inside the machine. The details can be revealed by checking the whole log from the backup (if there are any warnings in the sale log above the messages you quote) and details of the VM configuration (compare this VM with some other non-affected one).

Thank you.

lun 16/10/2017 - 09:02
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