Copying files inside Azure VM is terribly slow
I have a B4MS Azure Virtual Machine running and I have downloaded over 300GB files to my C: (Premium SSD) drive and now I'm copying these files to another (D:)data drive I have attached which is Premium SSD. However, when copying these data to the D: drive, the speed of file transfer is only capped at 30Mbps as follows. Even I tried to copy files within the C: drive, which is again 30Mbps. Would anyone can advise for this reason?
The Azure Documentation for B-Series VMs says itself that,
The B-series VMs are ideal for workloads that do not need the full performance of the CPU continuously
Azure B-Series VMs - Microsoft Documentation
A Standard B4ms VM has a Disk Throughput limit of 35MBps (for both cached and uncached disk storage), so it seems that 30MBps is a reasonable speed for your VMs.
You might have to switch to a higher-end config VM that can consistently provide full performance of the underlying hardware and not a "burstable" performance.
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