[opensuse] Copying *to* USB disk is slower than copying *from*
Hi, I run Opensuse 10.2 on a Dell Precision M70 Laptop. I have noticed that there is a very large difference in the speed when copying files to or from an external USB harddisk (ReiserFS-formatted). I have tested the speed by copying a 1155 MB file: Copy to USB-disk: 2.18 MB/s Copy from USB-disk: 25.5 MB/s Is this normal? If not, what can I do to speed up the copying to the USB disk? (It would be nice if I could speed up my backups.) Incidentally, my USB-disk also has a FAT partition. When copying to the FAT partition, the speed was 23.2 MB/s! How can this be? I wouldn't like to format the whole USB disk with FAT, because of file names and attributes, etc., so I hope there are other solutions. Regards, -- Svend Tollak Munkejord -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Svend Tollak Munkejord wrote:
Hi,
I run Opensuse 10.2 on a Dell Precision M70 Laptop. I have noticed that there is a very large difference in the speed when copying files to or from an external USB harddisk (ReiserFS-formatted). I have tested the speed by copying a 1155 MB file:
Copy to USB-disk: 2.18 MB/s Copy from USB-disk: 25.5 MB/s
Is this normal? If not, what can I do to speed up the copying to the USB disk? (It would be nice if I could speed up my backups.)
Incidentally, my USB-disk also has a FAT partition. When copying to the FAT partition, the speed was 23.2 MB/s! How can this be? I wouldn't like to format the whole USB disk with FAT, because of file names and attributes, etc., so I hope there are other solutions.
Regards,
in kde, right click on the device and look for a tab with options, some are faster (but less secure, don't remove the usb device too fast) jdd -- http://www.dodin.net http://dodin.org/mediawiki/index.php/GPS_Lowrance_GO -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On 2007-01-05, <jdd@dodin.org> wrote:
Svend Tollak Munkejord wrote:
Hi,
I run Opensuse 10.2 on a Dell Precision M70 Laptop. I have noticed that there is a very large difference in the speed when copying files to or from an external USB harddisk (ReiserFS-formatted). I have tested the speed by copying a 1155 MB file:
Copy to USB-disk: 2.18 MB/s Copy from USB-disk: 25.5 MB/s
Is this normal? If not, what can I do to speed up the copying to the USB disk? (It would be nice if I could speed up my backups.)
Incidentally, my USB-disk also has a FAT partition. When copying to the FAT partition, the speed was 23.2 MB/s! How can this be? I wouldn't like to format the whole USB disk with FAT, because of file names and attributes, etc., so I hope there are other solutions.
Regards,
in kde, right click on the device and look for a tab with options, some are faster (but less secure, don't remove the usb device too fast)
Thanks for the tip. Using Konqueror, I unchecked the options "Synchronous" and "Acces time updates". That helped; now the copy-to speed is as fast as the copy-from speed. What do these options actually do? Are they not safe to use as long as I use the "safely remove" function before unplugging the USB disk? Regards, -- Svend Tollak Munkejord -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Svend Tollak Munkejord wrote:
Thanks for the tip. Using Konqueror, I unchecked the options "Synchronous" and "Acces time updates". That helped; now the copy-to speed is as fast as the copy-from speed.
What do these options actually do? Are they not safe to use as long as I use the "safely remove" function before unplugging the USB disk?
this if perfectly safe is you use "safely remove" (or do a "sync" command) the slow mode writes immediately, but thus by small chunks, so the slowness, but then you can unplug the thing at once. this is unnoticable if the computer is iddle, but in case of heavy disk load the writing can be delayed some seconds, and in case of very big file some minutes (I use a 300Gb HDD, so video copying needs some time :-) jdd -- http://www.dodin.net http://dodin.org/mediawiki/index.php/GPS_Lowrance_GO -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Thanks for the fast and good help, jdd and Reinhard! Regards, -- Svend Tollak Munkejord -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Hello community, hello Svend Svend Tollak Munkejord wrote/schrieb:
On 2007-01-05, <jdd@dodin.org> wrote:
in kde, right click on the device and look for a tab with options, some are faster (but less secure, don't remove the usb device too fast)
Thanks for the tip. Using Konqueror, I unchecked the options "Synchronous" and "Acces time updates". That helped; now the copy-to speed is as fast as the copy-from speed.
What do these options actually do? Are they not safe to use as long as I use the "safely remove" function before unplugging the USB disk?
Look for the description of the options "async"/"sync" and "noatime"/"atime" while issueing "man mount" A coarse explanation: With the "sync"-option each block is forced to be written to the drive as soon as possible. This takes some time. With "async" the buffer gets written in larger chunks. A problem could be if one disconnects the drive to early. In this case the file system could be corrupted because not all data are written to the drive. -- Never give up ! Best regards / Gruß, Reinhard. "Software is like a parachute. It doesn't work if it is not open." -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (3)
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jdd -
Reinhard Gimbel -
Svend Tollak Munkejord