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Is there a way to turn off file caching for a USB drive
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General Schvantzkoph
Oct 8, 2012, 8:52:52 AM10/8/12
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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?
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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