Is there a way to turn off file caching for a USB drive

From	General Schvantzkoph <schvantzkoph@yahoo.com>
Newsgroups	comp.os.linux.hardware
Subject	Is there a way to turn off file caching for a USB drive
Date	2012-10-08 12:52 +0000
Message-ID	<adg0l4Fju0nU1@mid.individual.net> (permalink)

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I'm trying to measure the bandwidth of an external USB3 hard drive. I've 
tried both fio and my own program sys_basher but in both cases I'm getting 
impossibly high numbers, up to 3GB/sec for Direct Reads with and without 
Sync. If I run the same tests on an internal drive I get reasonable 
numbers, 230MB/sec Read Direct on a RAID0. Clearly file caching is always 
on for a USB device, is there anyway to turn it off?

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Is there a way to turn off file caching for a USB drive General Schvantzkoph <schvantzkoph@yahoo.com> - 2012-10-08 12:52 +0000

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