Solved Remarkably fast Write speeds. Amazingly fast. MR8, W11Pro282

Wisewiz · Oct 31, 2021

Have a peek at these shots. Essentially same disk 0 layout and contents; same OS; same version of MR (but the "speedy writer" is Home; the normal writer is Free.

Is MR just trying to make me feel good about how fast my writes are?

Top two are W11 compliant; bottom two non-compliant, but running happily.

Hopachi · Oct 31, 2021

Interesting, thanks for the screenshots.

Check the timings, both in about 2 mins, same disk model and almost same data sizes.
Shouldn't be almost same speeds expected?
One read speed close to the other so... write speed also needs to be close to the other, not 10x faster.

IMHO, there's a bug in the write speed reported on first screenshot.
Otherwise plain ol' logic would expect all operation to end close to 10x faster if write speed is 10x faster.
Unless we're dealing with different hardware.

Wisewiz · Oct 31, 2021

Yeah, my assumption is that there's a bug in MR8 on the wrong-write-speed machine, but I copied the reflect.exe from the right-report one to the wrong-report one, and the wrong reports continued, so it's somewhere else. Interesting, no? Yeah.

DigitalGoat · Oct 31, 2021

The speed you are looking at may well be the memory write speed as MR builds the backup file in a memory cache. If you use a memory benchmark tool you will see the throughput measured at approx that same speed.

Wisewiz · Oct 31, 2021

DigitalGoat said:
The speed you are looking at may well be the memory write speed as MR builds the backup file in a memory cache.

Wow! I hadn't thought of that!

But with the same exe file running on both machines, why would one report memory-write speed while the other reports disk-write speed?

I don't expect you to answer that; I'm just announcing a question that's in my mind atm.

DigitalGoat · Nov 1, 2021

There is a setting buried in Advanced options that allows you to change how the speed is reported, however the reported write speed at the time of building the backup file in the cache should always be the memory speed. The final write speed reported could possibly change depending on the write method, using Direct Disk IO or system cache, I forget the exact terms MR uses. :)

Hopachi · Nov 1, 2021

Are both machines on W11 and is the hardware similar?
I mean, disk sizes are, but how about memory, motherboard?

Wisewiz · Nov 1, 2021

Thanks for that information, my friend. I’ll investigate. I was going to report those write-speed numbers to Macrium, but I guess I should make sure I know what I’m talking about first.

Wisewiz · Nov 1, 2021

Hopachi said:
Are both machines on W11 and is the hardware similar?
I mean, disk sizes are, but how about memory, motherboard?

Yes, 282. Both Lenovo motherboards without major differences, both 16GB RAM. Weird-write-speeds-reported machine has faster RAM (DDR4 2666 v. DDR4 2400) but not faster enough to explain anything. Models of Lenovo very close. CPU of faster machine is 8th gen; of the other, 7th.

I still think it's a glitch in MR, but I'll investigate further today before I bother the Macrium people with my screenshots.

I simply do not believe a reported writing speed that's ... well, ... unbelievable.

Hopachi · Nov 1, 2021

Thanks. OK. I see, from your specs.
It can be MR but it can also be W11.
They did iron out some bugs on AMD lately, but Intel was ok, unless this is something else, also Lenovo, hardware related.

Wisewiz · Nov 2, 2021

DigitalGoat said:
There is a setting buried in Advanced options that allows you to change how the speed is reported [...] The final write speed reported could possibly change depending on the write method, using Direct Disk IO or system cache,

@DigitalGoat
You solved it for me. I must have changed the setting for reporting write speed. It's not hiding in Advanced settings or even Advanced-Advanced settings, but right under the Backup item up in the menu bar:
It's Disk Write Performance, and the panel that opens shows the method currently in use and offers an Edit button that lets you choose Direct Disk I/O, File System Cache, or Automatically Select. Mine was set to File System Cache, and the Edit button let me change it back to Direct Disk I/O, where I want it.

I don't recall having changed that setting, but it's fine now, and my reported read and write speeds make sense again now.
Thank you very much for your help. Marking this Solved.

DigitalGoat · Nov 2, 2021

Glad you found it despite my dodgy directions, I stopped using MR some time ago. :)

Wisewiz · Nov 2, 2021

DigitalGoat said:
I stopped using MR some time ago.

Careful, DG, that's tantamount to blasphemy around these here parts!

jimbo45 · Nov 3, 2021

Hi there
Macrium V8 has improved R/W speeds considerably and also optimised what needs to be written / read to / from the image file. Using "Buffering", large internal block sizes and doing what any sensible task manager in an OS should do is to overlap I/O with CPU processes - i.e while the CPU is processing something the Disk I/O controller can do its business.

Cheers
jimbo

ThrashZone · Nov 3, 2021

Hi,
Bug doubt you can be faster than your ssd's are capable of.

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