On Wed, 30 Jun 2010, Roman Mamedov wrote:
This is not necessary. See the dd man page about the conv=fdatasync switch. You can even test with just 256 MB this way, and still get an extremely accurate result.
You're right, for writing this is ok. For read tests it's important to use more than ram though, to avoid doing performance testing from block cache instead of from the actual drives.
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