Re: Weird XFS WAL problem

От: Kevin Grittner
Тема: Re: Weird XFS WAL problem
Дата: ,
Msg-id: 4C08D4380200002500031F5D@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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Random Page Cost and Planner  (David Jarvis, )
 Re: Random Page Cost and Planner  (David Jarvis, )
 Re: Random Page Cost and Planner  ("Kevin Grittner", )
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   Re: Random Page Cost and Planner  (Tom Lane, )
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     Re: Random Page Cost and Planner  (Alexey Klyukin, )
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   Re: Random Page Cost and Planner  (Rob Wultsch, )
    Re: Random Page Cost and Planner  (David Jarvis, )
     Re: Random Page Cost and Planner  (, )
   Re: Random Page Cost and Planner  ("Kevin Grittner", )
    Re: Random Page Cost and Planner  (David Jarvis, )
     Re: Random Page Cost and Planner  (David Jarvis, )
 Re: Random Page Cost and Planner  (, )
  Re: Random Page Cost and Planner  (David Jarvis, )
 Re: Random Page Cost and Planner  (David Jarvis, )
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   Re: Random Page Cost and Planner  (David Jarvis, )
    Re: Random Page Cost and Planner  (Cédric Villemain, )
     Weird XFS WAL problem  (Craig James, )
      Re: Weird XFS WAL problem  (Mark Kirkwood, )
       Re: Weird XFS WAL problem  (Craig James, )
        Re: Weird XFS WAL problem  (Matthew Wakeling, )
         Re: Weird XFS WAL problem  ("Kevin Grittner", )
          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, )
                  Re: Weird XFS WAL problem  (Bruce Momjian, )
        Re: Weird XFS WAL problem  (Greg Smith, )
      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:
> Kevin Grittner wrote:

>> 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?
>
> Because a write-back drive cache says it is on the drive before it
> hits the platters, which I think is the default for SATA drive.
> Is that inaccurate?

Any decent RAID controller will ensure that the drives themselves
aren't using write-back caching.  When we've mentioned write-back
versus write-through on this thread we've been talking about the
behavior of the *controller*.  We have our controllers configured to
use write-back through the BBU cache as long as the battery is good,
but to automatically switch to write-through if the battery goes
bad.

-Kevin


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