Re: Weird XFS WAL problem - Mailing list pgsql-performance

From Kevin Grittner
Subject Re: Weird XFS WAL problem
Date
Msg-id 4C08D2890200002500031F54@gw.wicourts.gov
Whole thread Raw
In response to Re: Weird XFS WAL problem  (Bruce Momjian <bruce@momjian.us>)
Responses Re: Weird XFS WAL problem  (Bruce Momjian <bruce@momjian.us>)
List pgsql-performance
Bruce Momjian <bruce@momjian.us> wrote:

> On another topic, I am a little unclear on how things behave when
> the drive is write-back. If the RAID controller card writes to the
> drive, but the data isn't on the platers, how does it know when it
> can discard that information from the BBU RAID cache?

The controller waits for the drive to tell it that it has made it to
the platter before it discards it.  What made you think otherwise?

-Kevin

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