Hot-swap SATA and atacontrol

[Colin King]

Try swapping drives without using atacontrol and read the kernel messages that
follow. It will tell you if it automatically detached the old drive and
attached the new drive, somewhat like it does with USB. If not, you will need
to use atacontrol to manually detach and attach. Either way, you will always
need to unmount it, and since this kind of operation has crashed my machine
many times, you might as well sync before you do anything too.

The feature list doesn't seem to tell you either way if hot plugging is
supported. With IDE, it depends on the chipset you're using.

On Tue, Aug 02, 2005 at 10:23:09AM +0100, Justin Finkelstein wrote:
> OK, so how can I be sure that the controller DOES support hotswap SATA?
> I've tested pulling and replacing the drive several times while the system's
> on, umounting and remounting it to no ill affect.
> 
> atacontrol's capability list below shows me lots of info, but I don't know
> how that relates to hotswap.
> one point is that the case comes with a hotswap backplane and I presume that
> the Supermicro board that's running the SATA should support hot-swap - it's
> running an Intel 6300ESB controller, and afaik that supports hot-swap.
> 
> ATA channel 1, Master, device ad2:
> 
> Protocol              Serial ATA v1.0
> device model          ST3160827AS
> serial number         4MT0J7AA
> firmware revision     3.42
> cylinders             16383
> heads                 16
> sectors/track         63
> lba supported         268435455 sectors
> lba48 supported       312581808 sectors
> dma supported
> overlap not supported
> 
> Feature                      Support  Enable    Value   Vendor
> write cache                    yes      yes
> read ahead                     yes      yes
> SATA NCQ                       yes       -      31/0x1F
> SMART                          yes      yes
> microcode download             yes      yes
> security                       yes      no
> power management               yes      yes
> advanced power management      no       no      65278/0xFEFE
> automatic acoustic management  no       no      0/0x00  254/0xFE
> 
> 
> 
> -----Original Message-----
> From: Søren Schmidt [mailto:sos at FreeBSD.org] 
> Sent: 02 August 2005 10:11
> To: Justin Finkelstein
> Cc: 'Colin King'; freebsd-current at FreeBSD.org
> Subject: Re: Hot-swap SATA and atacontrol
> 
> 
> 
> On 02/08/2005, at 9:42, Justin Finkelstein wrote:
> 
> > OK; so, what you're saying is that it'll be ok to pull the drive if
> > I've
> > unmounted it?
> > In that case, is the atacontrol step unneccesary? My thinking is  
> > that it
> > might be, but it's just another step to ensure nothing goes wrong.
> 
> "depends"
> 
> If the SATA controller supports hotswap ATA will notice when you yank  
> the drive and detach it properly from the system (ATA wise, if  
> mounted you get into trouble). Also it will autodiscover any SATA  
> driver added, again only on supporting chipsets (and those I know how  
> to handle).
> 
> - Søren
> 
> 
> 
> 
> 
> 
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-- 
Colin King
http://www.m202.net/

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