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Date:      Thu, 26 Jul 2007 12:42:50 +0100
From:      Tom Judge <tom@tomjudge.com>
To:        =?UTF-8?B?RGFnLUVybGluZyBTbcO4cmdyYXY=?= <des@des.no>
Cc:        Stephen Hocking <stephen.hocking@gmail.com>, hackers@freebsd.org
Subject:   Re: FreeBSD & Hot pluggable disks (SATA?)
Message-ID:  <46A888BA.3010905@tomjudge.com>
In-Reply-To: <86abtj34va.fsf@ds4.des.no>
References:  <6300771b0707252356i3e902d6ch7919ddbb70d411e7@mail.gmail.com> <86abtj34va.fsf@ds4.des.no>

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Dag-Erling Smørgrav wrote:
> "Stephen Hocking" <stephen.hocking@gmail.com> writes:
>> Have been looking at FreeNAS (http://www.freenas.org/) and thinking
>> about the iSCSI portion of it. At the moment the box requires you to
>> shutdown when a disk fails in order to replace it. Is this a feature
>> of the GEOM RAID stuff? Is it possible (assuming suitable hardware) to
>> have hot-pluggable disks under the control of GEOM?
> 
> It is a function of the disk controller and driver.  AFAIK, the ata
> driver supports hot-plug as long as the SATA controller does.  I believe
> most Promise and Intel ICH SATA controllers do, not sure about Sil or
> nVidia MCP.
> 
> DES

If you where using SATA disks on a SAS controller then I think you would 
also need a back plane with an environmental services controller on it 
to support hot plug.

Tom



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