Use RAMMap (SysInternals) to determine whether "Mapped File" usage in memory stops growing because of free memory exhaustion.
For more information, see Performance tuning for SMB file servers. To verify this situation, use storage performance monitor counters to determine whether storage performance degrades over time. This change forces data to be written directly to disk (write-through). A change in copy speed occurs when the initial copy is cached or buffered, in memory or in the RAID controller's memory cache, and the cache runs out. Copy speeds are limited by storage speed.įile copies sometimes start fast and then slow down.
Try the file copy command for unbuffered IO: If you observe slow transfers of files, consider the following steps: You can troubleshoot slow file transfers by checking your current storage use. This article provides troubleshooting procedures for slow file transfer speeds through SMB. So why do get 3190 MB/s when I backup to a Windows 10 system and only 2333 MB/s when going to a Windows Server 2019 system? I would have expected identical results, perhaps a little faster on the Windows Server 2019.Server Message Block (SMB) file transfer speeds can slow down depending on the size and quantity of your files, your connection type, and the version of apps you use. That's a big difference!Ĭonfused over the speed difference, I ran CrystalDiskMark 6.0 and got almost identical results of 3500MB/s read and 2700MB/s write on the SSD on both systems. Recently I started booting the Eagle system to running Windows Server 2019 and I noticed that I was getting an average speed of 2333 MB/s when I ran the identical backup. ROBOCOPY /MT:1 /MIR /R:0 /W:0 /LOG:G:\files.log /NP /NDL \\Robin\g\HyperV-Exported-Systems \\Eagle\g\HyperV-Exported-Systemsįor several months I have been backing up the Hyper-V systems from the Robin system to the Eagle system and was getting an average speed of 3190 MB/s
I use robocopy to backup the SSD, using the command: One system can be dual booted with Windows Server 2019.īoth systems have a separate G: drive consisting of a Samsung 970 Pro 954gb SSD for Hyper-V Linux Systems testing and backup. I have two Dell 8920 Workstations running Windows 10 Pro for Workstations.
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