Re: Weird XFS WAL problem

От: Kevin Grittner
Тема: Re: Weird XFS WAL problem
Дата: ,
Msg-id: 4C08D2890200002500031F54@gw.wicourts.gov
(см: обсуждение, исходный текст)
Ответ на: Re: Weird XFS WAL problem  (Bruce Momjian)
Ответы: Re: Weird XFS WAL problem  (Bruce Momjian)
Список: pgsql-performance

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     Re: Random Page Cost and Planner  (David Jarvis, )
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       Re: Weird XFS WAL problem  (Craig James, )
        Re: Weird XFS WAL problem  (Matthew Wakeling, )
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          Re: Weird XFS WAL problem  (Greg Smith, )
           Re: Weird XFS WAL problem  ("Kevin Grittner", )
            Re: Weird XFS WAL problem  (Scott Marlowe, )
             Re: Weird XFS WAL problem  ("Kevin Grittner", )
             Re: Weird XFS WAL problem  (Greg Smith, )
              Re: Weird XFS WAL problem  (Scott Marlowe, )
              Re: Weird XFS WAL problem  ("Kevin Grittner", )
              Re: Weird XFS WAL problem  (Matthew Wakeling, )
           Re: Weird XFS WAL problem  (Bruce Momjian, )
            Re: Weird XFS WAL problem  ("Kevin Grittner", )
             Re: Weird XFS WAL problem  (Bruce Momjian, )
              Re: Weird XFS WAL problem  ("Kevin Grittner", )
               Re: Weird XFS WAL problem  (Bruce Momjian, )
                Re: Weird XFS WAL problem  ("Kevin Grittner", )
                 Re: Weird XFS WAL problem  (Bruce Momjian, )
                 Re: Weird XFS WAL problem  (Greg Smith, )
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      Re: Weird XFS WAL problem  (Merlin Moncure, )
      Re: Weird XFS WAL problem  (Greg Smith, )
  Re: Random Page Cost and Planner  (Bryan Hinton, )
   Re: Random Page Cost and Planner  (David Jarvis, )

Bruce Momjian <> 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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