On 3/2/21 12:47 PM, Frederic Muller wrote:
On 3/2/21 4:23 PM, Roberto Ragusa wrote:
On 3/2/21 8:34 AM, Frederic Muller wrote:
Anyway since I am somehow back to initial lousy speeds and saw it way faster on the same machines, is there a "reliable" way to go back to more decent speed then?
Before putting filesystems in the middle:
hdparm -t /dev/xxxxxxx
to test sequential read speed.
I think there is a misunderstanding about my question: somehow I cannot get reliable read speed as depending on the machine (not sure) or/and the OS (and its patches) used I get very very different real usage speed on 2 different machines (we're talking hour+ to minutes differences to copy those files).
You just want the result and it is not sure what you are measuring and in which conditions.
That's why you should try things in order:
- lsusb -t (guess you may be falling back from USB3 to USB2 for some reason, since 40-50MB/s is typical of USB2)
- hdparm -t /dev/xxxxx to see the actual reading speed of the raw device as configured in that moment
- then add the filesystem in the middle (caching + possible issues with ntfs that may be fuse, who knows)
- then reach the "I'm just copying" files, where we do not know what are you reading from and if it is already cached or not
Regards and good luck.
--
Roberto Ragusa mail at robertoragusa.it
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