On 11/04/13 13:26, Greg Freemyer wrote:
BC,
I happened to need to copy 1 TB of data between 2 NTFS USB-3 drives today. I only had a windows laptop handy and being who I am, I decided to boot a openSUSE boot cd/dvd instead of using windows.
The boot cd/dvd I had handy was OS 12.2 based. I had built it myself (http://susestudio.com/a/eD1wrT/dfir-opensuse-gnome-desktop-32bit).
I used the CLI and did cp -a /mnt/data /mnt1/data. I was running without X, just the alt-f2 style terminals.
I got 90 MB/sec at the start of the process (per iostat -d 10). My data files were all 1.4GB each, so this was a large file copy test only.
I haven't had the opportunity to test this with OS 12.3, but I'm very curious if OS 12.3 is slower than OS 12.2 for this or if you have something weird on your PC.
Well, after after you wrote I thought that I would do a test or two. Just to refresh the memories, I have an external USB3 HDD (a Seagate 2TB) which I split into 2 partitions: partition 1 formatted in ext4 and partition 2 formatted in ntfs. Copying files from the system's internal HDDs (2X SATA3 1TB Seagates) to the ntfs formatted partition on the external USB3 HDD in earlier attempts, using both the cp CLI command and copying using my preferred file manager mc (Midnight commander) produced: ~25MB/s using mc; and ~31MB/s using the CLI cp command Copying the same file to an USB3 memory stick formatted in ext4 produced ~73MB/s. After reading your post I booted the computer using SystemRescueCD v3.1.2, mounted the partitions on the internal HDDs and the ntfs and the ext4 partiotions on the external HDD and went thru the same exercise as above. The results were little different to the ones I quote above. On the other hand, copying the same large file 7,631,404,437 bytes big, to the partition on the external HDD formatted in ext4 produced a transfer speed of ~79MB/s (which was a bit faster than when, in the earlier trial I copied the file to an USB memory stick, I got a transfer speed of ~73MB/s). BTW, you mention at the beginning of your message that "I got 90 MB/sec at the start of the process " - but you don't mention what you finally ended up with :-) . For the first couple of seconds the thruput is mind-boggling while the cache in the HDD is being populated but after that...... :-) . And so....what has been resolved? Anything? Rather interesting that nobody with any "inside knowledge" about ntfs-3g is put together has commented or made suggestions as to why there are such differences in the transfer rates - especially in the light of what is written in the wikipedia (which I quoted). BC -- Using openSUSE 12.3 x86_64 KDE 4.10.2 & kernel 3.8.6-2 on a system with- AMD FX 8-core 3.6/4.2GHz processor 16GB PC14900/1866MHz Quad Channel Corsair "Vengeance" RAM Gigabyte AMD3+ m/board; Gigabyte nVidia GTX550Ti 1GB DDR5 GPU -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org