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?
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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