I tried the procedure in the post at viewtopic.php?p=1636401#p1636401 but it made no difference (so I undid it again). One post (which I now can't find) said it might be related to a certain part of USB3 (it had an acronym) which can be turned off, and then people get faster transfer speeds because it no longer throttles them. The issue of USB3 data backups to a HDD being fast, then suddenly dropping, seems to be quite common. Since FreeFileSync estimates the end time based on current transfer speed, I watch with dismay as the "20 minutes" estimate grows and grows until it is saying "22 days"! Since it's obvious my PC can do 150MB/s, that's pretty frustrating. So my question is, what causes the slowdown? A cacheing issue with USB3? But in that case, why does it never catch up again, especially when I have so much memory? Instead of the backup taking half an hour, I had to stagger it over three days and multiple reboots to get it finished. If I reboot and try it again, I get the 150MB/s speed again, but by the time it's done 10GB or so it starts dropping again. The CPU goes from c.1% usage up to c.20-30%. My PC has 32GB RAM, but even during the backup only 2GB is being used by the OS. It's as if the data transfer speed is being throttled.ĭuring this time I have a system monitor running. Kind of like a pulse, but the higher speeds are a bit lower each time, and it never goes back up to the fast speeds - max is c, 30MBs, but often at a crawl. It ends up dropping below 1MBs, sometimes to 0KBs, but then it gets faster again, then slower, then faster. Doesn't matter if it is on a big file like an iso or loads of tiny ones. However, after a short period of time (from 30 seconds to ten minutes) the speed starts dropping massively. On my old PC (USB2 only) I'd have been waiting hours. Great! Even with a huge backup of 200GB, FFS shows it will only take 20 mins or so. When I first start a large backup it has speeds of over 150 MB/s. It is a brand new PC, all components pretty fast and fancy. So I am now backing up my personal data from my internal ext4 HDD to an external ext4 HDD via USB3, using FreeFileSync. I also now make sure the drive is unmounted before logout (which can take a few minutes sometimes) - the original errors were probably bad drive etiquette on my part, thinking the drive was safe to unplug when it was actually still working (Disks showed it as being in the process of unmounting). my girlfriend's Windows laptop) - but now I just use ext4, and in an emergency would USB live-boot into Mint from her laptop, copy any files I need from the backup to her data drive, and then access them in Windows. Originally I was backing up to NTFS so that in an emergency I could still access my files from any PC (e.g. As a result I changed my process and have seen the reliability go up, fixing my original issues. For background, I had some issues doing backups ( viewtopic.php?f=47&t=364853).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |