Re: WAPBL and write cacheing (was: SATA write performance problems)

To: tech-kern%netbsd.org@localhost
Subject: Re: WAPBL and write cacheing (was: SATA write performance problems)
From: Lars Heidieker <lars.heidieker%googlemail.com@localhost>
Date: Thu, 3 Jan 2013 12:54:23 +0100

On Thu, Jan 3, 2013 at 12:49 PM, Edgar Fuß <ef%math.uni-bonn.de@localhost> 
wrote:
>> Doesn't this depend on filesystem journaling?
> Can someone please enlighten me?
> Is it safe to use write cacheing on a SATA drive with FFS/WAPBL on it?

AFAIK it depends on the drive, if it doesn't lie about the command to
flush the cache it's safe.
WAPBL sends such a command on commit.

Follow-Ups:
- Re: WAPBL and write cacheing (was: SATA write performance problems)
  - From: Andy Ruhl

References:
- SATA write performance problems (on HP MicroServer)
  - From: Edgar Fuß
- Re: SATA write performance problems (on HP MicroServer)
  - From: Michael van Elst
- Re: SATA write performance problems (on HP MicroServer)
  - From: Edgar Fuß
- Re: SATA write performance problems (on HP MicroServer)
  - From: Michael L. Hitch
- Re: SATA write performance problems (on HP MicroServer)
  - From: Andy Ruhl
- WAPBL and write cacheing (was: SATA write performance problems)
  - From: Edgar Fuß

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