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In-Reply-To: <4DFC1351.2000002@2ndQuadrant.com>
References: <201106171455.45391.achill@matrix.gatewaynet.com>
	<4DFC1351.2000002@2ndQuadrant.com>
Date: Mon, 10 Oct 2011 13:27:26 -0400
Message-ID: 
 <CA+TgmoYF_QQoTWT-8S3tF8hwvD8rsbopqcCp-xO2Gr6o=X7jkQ@mail.gmail.com>
Subject: Re: Small correction in
	http://www.postgresql.org/docs/9.0/interactive/wal-reliability.html
From: Robert Haas <robertmhaas@gmail.com>
To: Greg Smith <greg@2ndquadrant.com>
Cc: pgsql-docs@postgresql.org
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On Fri, Jun 17, 2011 at 10:54 PM, Greg Smith <greg@2ndquadrant.com> wrote:
> On 06/17/2011 07:55 AM, Achilleas Mantzios wrote:
>>
>> It reads :
>> 'On FreeBSD, IDE drives can be queried using atacontrol, and SCSI drives
>> using sdparm.'
>> but it should be:
>> 'On FreeBSD, IDE drives can be queried using atacontrol, and SCSI drives
>> using camcontrol.'
>>
>
> FreeBSD's Common Access Method (CAM) looks to be the preferred driver lay=
er
> to interrogate. =A0sdparm is available on Linux and FreeBSD, but it's a
> second-class citizen talking to CAM on the latter. =A0To quote from one o=
f the
> docs on it, FreeBSD sdparm "SCSI commands are routed through the CAM
> pass-through interface". =A0Talking directly to it with camcontrol does s=
eem
> to be the preferred route for some things.
>
> However, the UI to sdparm is a bit easier to use when it is available.
> =A0Actually changing the write cache state with camcontrol requires black
> magic--you have to construct the right SCSI packet by hand. =A0I can't fi=
nd
> any example.
>
> Bruce just touched this section of the docs recently, so this part actual=
ly
> reads just:
>
> =A0 =A0 =A0 =A0 SCSI drives use <command>sdparm</command>.
>
> Now. =A0Perhaps the following makes sense:
>
> =A0 =A0 =A0 =A0 SCSI drives can be queried using <command> camcontrol
> identify</command>, and the write cache both queried and changed using
> <command>sdparm</command> when available.

Done, in master and REL9_1_STABLE.

--=20
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company