What filesystem for large thumbdrive

[Jerry Feldman]

I've been trying to push 800+GB to a USB drive at work so I can send it
back to NY so they can restart their nightly backups. While I started to
use rsync (as a test of the NY backup script), I killed it and used cp
-pRdu which does look faster. AFAIK, USB2 is spec'd at 480Mbps, but you
never will get close to that. In my WD Mybook II to the attached USB
drive from NY, I might be getting 10Mbps

On 08/27/2010 06:59 AM, Dan Ritter wrote:
> On Fri, Aug 27, 2010 at 12:23:15AM -0400, David Kramer wrote:
>  =20
>> On 08/22/2010 07:33 AM, Matthew Gillen wrote:
>>    =20
>>> On 8/22/2010 2:47 AM, David Kramer wrote:
>>>      =20
>>>> I would like to use a thumbdrive for offsite backup so I picked up a=
t
>>>> 16G thumbdrive (the backup file for my server is about 12G).  In oth=
er
>>>> words, my use case is a very few but very large files.
>>>>
>>>> I formatted it with ext3 with 2K block size (so I can put larger fil=
es
>>>> on it), and am finding it VERY slow.  I'm trying to copy the backup =
file
>>>> to it, and 45 minutes later only 1.5G of the file was copied so far.=

>>>>        =20
> ...
>
>  =20
>> I reformatted the thumb drive with ext2.  I started copying my backup
>> file onto it at about 10:00pm, and at 12:20 it had copied only 7GB of
>> the file in the two hours.  Maybe this thumb drive really is that slow=
=2E
>>  I would think the 2K block size would make it even faster.
>>
>>
>> Maybe I need to give up on this idea, or assume I'll have to copy the
>> file on overnight or something.
>>    =20
> The top speed I've ever seen over USB2 is 34 MB/s, to an
> external hard disk.
>
> The top speed I've ever seen writing to a thumb drive is about
> 12 MB/s.
>
> It looks like you're getting roughly 1 MB/s, which is either a
> defective thumb drive... or a USB 1.0 interface. I would check
> for that.
>
> -dsr-
>
>  =20


--=20
Jerry Feldman <gaf-mNDKBlG2WHs at public.gmane.org>
Boston Linux and Unix
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