On Fri, Apr 12, 2013 at 9:36 AM, Greg Freemyer <greg.freemyer@gmail.com> wrote:
OK , taking all this into account, what can be wrong at *my* end, in my
system, which could cause such a speed difference?
BC
Basil,
I have to copy 500 GB of data from ntfs to ntfs via usb3 today.
I will use opensuse 12.3 this time.
Separately, ntfs has a auto-document indexing feature. I keep it disabled by default. Do you know if you have it enabled? I think a vanilla mkfs.ntfs has it enabled. There is a flag to disable it. I did not think opensuse even had support for that ntfs feature, but it is one of the few issues I can imagine it being.
Greg
I had no speed issues with OS 12.3 either, so both OS 12.2 and 12.3 seem fine to me. ie. 90 MB/sec reading from NTFS USB-3 and writing to NTFS USB-3 via a simple cp -a command. This is with different disks, cables and laptop from what I did yesterday. (Yesterday was a 12 month old HP laptop. Today was a 18-month old Dell Laptop. Both have native / built-in USB-3 support for at least 2 ports.) Both yesterday and today, I was copying 1.4GB files. Yesterday I did about 1 TB, today turned out to only be 80 GB, but still big enough to be a good test. Basil, since you're willing to reformat the drive, try to format it with: mkfs.ntfs --no-indexing --fast /dev/sdb1 (Or whatever your device is). The drives I am reading / writing were formatted by the manufacturer, so I don't know off hand if they have the indexing flag set. And I only know how to check it via windows. In windows you just go to the properties window and there is a check box for indexing. Also, can you try a series of test like this with your 8 GB file: time dd if=<ext4-source-file> of=<ntfs-destfile> bs=4K conv=fdatasync time dd if=<ext4-source-file> of=<ntfs-destfile> bs=8K conv=fdatasync time dd if=<ext4-source-file> of=<ntfs-destfile> bs=1M conv=fdatasync Obviously replace the filenames with appropriate paths. You should not see much difference in throughput for those, but if something is wrong with the caching / buffering / readahead on your machine, maybe you will. To be honest I'm running out of ideas why your box is slow for this. Greg Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org