Mark
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USB Drive very slow
I have two identical, new, WDC WD30EZRX-00DC0B0 external, self-powered 3TB USB drives connected to each of 2 of what are supposed to be the USB 3.0 ports on my Gigabyte Technology GA-78LMT-USB3 motherboard. My system is running Linux Slackware version 13.37.0, kernel 2.6.37.6.
Copying from one drive to another seems very, very slow. It takes about 8 hours to copy a 190G file.
On the port closest to the mother board, initial command line pathname completion takes 20+ seconds. ls -ltr initiall takes 25+ seconds. likewise, df takes 15-ish seconds to return
On the port above that one pathname completion and ls are instantaneous.
By contrast it only took 4 hours to copy over 400GB to an identical USB drive on another computer (although not copying between USB drives).
Does 8 hrs for 190GB this seem reasonable for copying between USB drives?
Should both drives not be plugged into the same bus?
Does this seem like a problem with motherboard, drive?
Copying from one drive to another seems very, very slow. It takes about 8 hours to copy a 190G file.
On the port closest to the mother board, initial command line pathname completion takes 20+ seconds. ls -ltr initiall takes 25+ seconds. likewise, df takes 15-ish seconds to return
On the port above that one pathname completion and ls are instantaneous.
By contrast it only took 4 hours to copy over 400GB to an identical USB drive on another computer (although not copying between USB drives).
Does 8 hrs for 190GB this seem reasonable for copying between USB drives?
Should both drives not be plugged into the same bus?
Does this seem like a problem with motherboard, drive?
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Hardware_Guy - thanks for participating!
EE: I solve the problem myself
EE: I solve the problem myself
ASKER
The drives are self powered, not powered from the hub, so that shouldn't be a factor. According to my research, Linux has supported USB 3.0 since kernel release 2.6.31. This kernel is 2.6.37.6, so USB 3.0 should not be a problem. The mother board is new, purchased this summer.
I have determined that it is not the drive. I swapped out the drive that was taking a looong time to give me the `ls` listing, and replaced it with the drive from the different machine that apparently managed to copy 400GB in 4 hours (on the same version of Linux). Unfortunately, the looong `ls` and `df` times persisted. Interestingly, the "slow" drive is the one being read from, not the one being written to. I would think it should be the other way aroundI am running a copy right now to see if the files copy faster, but I'm not hopeful.
Could there be an issue with read/writing from/to drives on the same USB hub? Perhaps I should switch one of the drives to a different hub (which would be USB 2.0).
Thoughts?