Gbak and Windows defender/antimalware? or what else can be the source?

[Dany40]

Hello!

Using latest Firebird 4 (64 bits) I use this command for backups:

gbak -b -g -se localhost:service_mgr E:\DATOS\BASE.FDB E:\BACKUP\BASE.FBK -user uno -password uno

As an example:

- Windows 2012 dataservers, it takes 8 minutes for a 50GB database.

- Windows 2019 dataservers, it takes 67 minutes for a 50GB database.

I am testing this over 6 virtual machines, all with exactly the same resourses, 3 are W2012 and 3 are W2019. Same results always. 

Thinking the source is defender/antimalware, I added exceptions for Firebird and data folders, but no differences.

Does anyone have any suggestion?

Thank you very much!

[Dimitry Sibiryakov]

Dany40 wrote 04.09.2025 16:18:
> I am testing this over 6 virtual machines, all with exactly the same resourses,
> 3 are W2012 and 3 are W2019. Same results always.

Have you tested on a real hardware? Quite possible that it is an issue with
virtual hardware support.

--
WBR, SD.

[Dany40]

Thank you! I did it, and I found that over real hardware it perform at a normal rate. But it seams that always GBAK is going always faster over a clean instalation of Windows 2012 vs. Windows 2019. Maybe something related on how both O.S. manages caches, or maybe antimalware .... I can't find the source of this big difference in performance.