Copying from a Linux based NAS to USB2 Ext HDD

Simpic

Simpic

Simpic

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Joined
3 Sep 2009
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167
Hello,

Can anyone confirm the speed I am getting doing a copy from a user share to a USB2 drive mounted on the server directly? The NAS is unRAID.

I kicked off the copy at 0800 this morning and here is a df on the dir at the moment...

/mnt/user/usb/movies# df .
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdg1 2930263036 634941144 2295321892 22% /mnt/user/usb
Filesystem Size Used Avail Use% Mounted on
/dev/sdg1 2.8T 609G 2.2T 22% /mnt/user/usb

So 609GB filled up after 10 hours or so.

Should this be copying quicker? Is there anyway to speed it up?

I need the whole 2.4TB share copied to the drive by 0900 Saturday morning and I would like some time to spare.

Regards,

Simpic
 
NAS are often slow.
Could you try taking the hd out and connecting it directly to a spare sata on you mobo?
could also do this with the usb one to gain even more speed?
 
hdparm -tT /dev/sdg

will tell you what speeds your USB drive is capable of

If it's USB2 simple maths should tell you 240mbps/8 = a peak throughput of 30MB/s I usually get between 20-25 but at minimum 20
 
You're getting 609 * 1024 * (1/10) * (1/3600) = 17.3 megabyte/s. As above, that's about par for the course over usb2.

It would be prudent to use rsync to copy the data instead of cp, if you're not already doing so.
 
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