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Linux block devices read/write the page cache by default. You have to use O_DIRECT if you want to bypass the cache. dd oflag=direct. IIRC, some unices default to direct I/O on block devices. (And require reading / writing of aligned blocks, which Linux doesn't because it's just writing the pagecache anyway.)

Peter Cordes
– Peter Cordes

2015-08-22 23:36:48 +00:00
Commented Aug 22, 2015 at 23:36

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