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"Enable advanced performance" - the optimization that isn'tI used to think this setting was a decent performance thing, and used to enable it. My impression, based on various faulty wannabe-tech-knowledgy blogs was that "Enable write caching" was only the usual filesystem caching, whereas "Enabled advanced performance" meant the actual disk write cache (ie., the on-disk memory buffer, usually 8, 16 or 32 megabytes). It's a while since I learned the true meaning, and turned off the setting in shock, and then didn't think much more about it. But after yesterday's slashdot article Apps That Rely On Ext3's Commit Interval May Lose Data In Ext4 (and especially a lot of the moronic comments, sigh) I remembered this setting again, and thought it would be a decent thing warning about it here at DC. Basically, what it does is making the Windows API function FlushFileBuffers() do nothing. This API is meant to flush the OS's write cache for a file to disk, and is the only way to guarantee that your data goes to disk in a modern OS. Enabling the setting probably won't affect a lot of software positively (since not a lot of software actually uses FlushFileBuffers()), but for things like databases this is crucial to ensure data consistency across crashes. Read the technet link for a more in-depth description, and go turn that checkmark off if you have it enabled.. |
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