Robocopy runs very slow...


P

PMB

Member
Local time
10:07 AM
Posts
9
OS
Windows 11
I am new to Robocopy and trying to learn as I go. I have two external USB connected hard disk drives, E: is a 10 TB (7.2 TB capacity) drive with 1.96 TB used space, G: is a 12 TB (10.9 TB capacity) drive and is new. The E: drive is 6 years old and I want to replicate the filesystem from E: to G: and continue using E: but occasionally (maybe weekly) keeping G: up to date with the contents on E: The filesystem contains years of photography and video files so the sizes are mostly large with some very large.

I have performed a couple test copies, choosing just one folder for now, to see how robocopy works. My latest attempts have include the /mir switch. I am finding that some time robocopy runs ok and sometimes it is extremely slow. See below two logfiles (middle sections removed to save space), each run copying the exact same files & folders. I have highlighted the speed in each log file. The second run where I am testing (for the first time) the /mir switch runs about 13 times slower. Why? What can I do to speed this up? And what do the times mean at the end of the log file - they don't make any sense to me?
1746790108611.webp


1746790155673.webp
Thanks,
Peter
 
Windows Build/Version
Windows 11 Home, 24H2, OS Build 26100.3194

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS ROG STRIX Z790 E
    CPU
    i7-13700K 3.40 GHz
    Motherboard
    ASUS ROG STRIX Z790 E
    Memory
    64 GB
    Graphics Card(s)
    GIGABYTE RTX 3070 Ti
    Sound Card
    n/a
    Monitor(s) Displays
    BenQ SW2700 inch & Dell P1917S
PMB said:
I am new to Robocopy and trying to learn as I go. I have two external USB connected hard disk drives, E: is a 10 TB (7.2 TB capacity) drive with 1.96 TB used space, G: is a 12 TB (10.9 TB capacity) drive and is new. The E: drive is 6 years old and I want to replicate the filesystem from E: to G: and continue using E: but occasionally (maybe weekly) keeping G: up to date with the contents on E: The filesystem contains years of photography and video files so the sizes are mostly large with some very large.

I have performed a couple test copies, choosing just one folder for now, to see how robocopy works. My latest attempts have include the /mir switch. I am finding that some time robocopy runs ok and sometimes it is extremely slow. See below two logfiles (middle sections removed to save space), each run copying the exact same files & folders. I have highlighted the speed in each log file. The second run where I am testing (for the first time) the /mir switch runs about 13 times slower. Why? What can I do to speed this up? And what do the times mean at the end of the log file - they don't make any sense to me?




Thanks,
Peter
Click to expand...
So many variables there, Peter.
Are all those HDDs? Are the USB ports all the same type? A-B or C ?
Are the files indexed?
 

My Computers

System One System Two

  • OS
    Windows 11 Pro for Workstations
    Computer type
    Laptop
    Manufacturer/Model
    ASUSTeK COMPUTER INC. TUF Gaming FX705GM
    CPU
    2.20 gigahertz Intel i7-8750H Hyper-threaded 12 cores
    Motherboard
    ASUSTeK COMPUTER INC. FX705GM 1.0
    Memory
    24428 Megabytes
    Graphics Card(s)
    Intel(R) UHD Graphics 630 / NVIDIA GeForce GTX 1060
    Sound Card
    Intel(R) Display Audio / Realtek(R) Audio
    Monitor(s) Displays
    Integrated Monitor (17.3"vis)
    Screen Resolution
    FHD 1920X1080 16:9
    Hard Drives
    2 SSD SATA/NVM Express 1.3
    WDS500G2B0A-00SM50 500.1 GB
    WDCSDAPNUW-1002 256 GB
    PSU
    19V DC 6.32 A 120 W
    Cooling
    Dual Fans
    Mouse
    MS Bluetooth
    Internet Speed
    Fiber 1GB Cox -us & IGB Orange-fr
    Browser
    Edge Canary- Firefox Nightly-Chrome Dev-Chrome Dev
    Antivirus
    Windows Defender
    Other Info
    VMs of Windows 11 stable/Beta/Dev/Canary
    VM of XeroLinux- Arch based & Debian 13 (Trixie)
  • Operating System
    Windows 11 Insider Canary
    Computer type
    Laptop
    Manufacturer/Model
    ASUS X751BP
    CPU
    AMD Dual Core A6-9220
    Motherboard
    ASUS
    Memory
    8 GB
    Graphics card(s)
    AMD Radeon R5 M420
    Sound Card
    Realtek
    Monitor(s) Displays
    17.3
    Screen Resolution
    1600X900 16:9
    Hard Drives
    1TB 5400RPM
The older HDD I bought in March 2019 as so I am thinking I need to be prepared for when it gives me trouble. It is a G-Technology 16TB G-RAID Removable Thunderbolt 3 connected to a USB 3.2 Gen 2 10 GB/s with a compatible USB cable that came with the drive Type-C to Type-C. This box has a pair of 8 GB 7200 rpm drives that are mirrored (in the G-RAID box).
The new HDD I bought it in April 2025. It is a WD G-RAID MIRROR with a pair of 12 TB 7200 rpm drives, mirrored. Again connected to a USB 3.2 Gen 2 10 GB/s with a compatible USB cable that came with the drive Type-C to Type-C.
Ah, indexing... I just checked. The older HDD is not indexed but the newer one is, I guess by default.

Peter
 

My Computer

System One

  • OS
    Windows 11
    Computer type
    PC/Desktop
    Manufacturer/Model
    ASUS ROG STRIX Z790 E
    CPU
    i7-13700K 3.40 GHz
    Motherboard
    ASUS ROG STRIX Z790 E
    Memory
    64 GB
    Graphics Card(s)
    GIGABYTE RTX 3070 Ti
    Sound Card
    n/a
    Monitor(s) Displays
    BenQ SW2700 inch & Dell P1917S
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