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SubjectRe: Serial ATA (SATA) for Linux status report
Jeff Garzik wrote:
> Andre Tomt wrote:
>
>> On Wed, 2003-12-03 at 21:44, Jeff Garzik wrote:
>>
>>> Intel ICH5
>>> ----------
>>> Summary: No TCQ. Looks like a PATA controller, but with a few added,
>>> non-standard SATA port controls.
>
>
>> One question - with "including hotplug", does that mean some set hotplug
>> standard? Reason I'm asking is, we have a few servers from SuperMicro,
>> with a ICH5R S-ATA controller that claims it's supporting hotplug, but
>> hotplug is not in your ICH5-summary.
>
>
> Alas, there is no hotplug support in the ICH5 or ICH5-R SATA hardware.
>
> One could argue there is "coldplug" support in that hardware -- disable
> the entire interface, including any active devices, then re-enable and
> re-scan -- but it's a bit of a hack. If there's enough demand, I could
> write some code for that. It would involve something like
>
> # /sbin/sata off
> { plug in or remove a device }
> # /sbin/sata on
>
> You really, really, really don't want to actually unplug a SATA drive
> while it's active, on ICH5 hardware.
>

In theroy the scsi driver allows you kill a drive, and do rescan by
echoing to /proc/scsi.scsi. I know it worked under 2.4 with sca drive
on a hotswap backplane. This was over a year ago. So it may have been
broken.

scsi.c:
* Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
* with "0 1 2 3" replaced by your "Host Channel Id Lun".


/*
* Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
* with "0 1 2 3" replaced by your "Host Channel Id Lun".
*

PS- Yes I know says it isn't for hotswap, and that it's prebeta. This
comment dates back to at least 2.2. It's worked for least 4 years.
--
There is no such thing as obsolete hardware.
Merely hardware that other people don't want.
(The Second Rule of Hardware Acquisition)
Sam Flory <sflory@rackable.com>

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