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poige
Asked: 2011-02-01 19:06:23 +0800 CST

What is read cache in "[sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA"?

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I'm trying to figure out what the read cache part of the following message refers to:

[sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

Is it "IDE drive's read-lookahead feature (usually ON by default)" as treated by hdparm?

If it's not, how can this be turned off?

hard-drive linux cache disk-cache

1 Answers

  1. Best Answer

    Well, I've found out proper tool to control this cache: sdparm.

    It looks like as not having any relation to read-ahead cache. Also, seemingly rare SATA drive is able to unset this bit.

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