[4976] in linux-scsi channel archive
Re: Howto: rescan scsi bus after a hot swap ??
daemon@ATHENA.MIT.EDU (Hardware Stuff)
Fri Oct 23 03:48:15 1998
Date: Fri, 23 Oct 1998 00:46:22 -0700
From: Hardware Stuff <mrfixit@clouddancer.com>
To: chrisa@ultranet.com
CC: linux-scsi@vger.rutgers.edu, ncr53c810@Colorado.EDU
In-reply-to: <Pine.LNX.4.05.9810222019260.6133-100000@chris.atenasio.net>
(message from Chris Atenasio on Thu, 22 Oct 1998 20:22:55 -0400 (EDT))
Reply-to: mrfixit@clouddancer.com
From: Chris Atenasio <chrisa@ultranet.com>
On Thu, 22 Oct 1998, Hardware Stuff wrote:
> Is there a simple command (or even a tough one) to rescan the bus to
> determine the new ID, etc? I've seen such a program on Macintoshes,
> so surely Linux....
But of course! This is Linux we're talking about! :)
>From /usr/src/linux/drivers:
/*
* 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".
* Consider this feature BETA.
* CAUTION: This is not for hotplugging your peripherals. As
* SCSI was not designed for this you could damage your
* hardware !
* However perhaps it is legal to switch on an
* already connected device. It is perhaps not
* guaranteed this device doesn't corrupt an ongoing data transfer.
Hmm, I just read my controller's README...missed that.
Plot Complications: The Mac program I'm referring to didn't need to
know squat...and I didn't happened to look at the ID settings either
(it's on the unused bus of a dual controller).
Now, I know it's possible, since the latest RAID5 can perform a hot
reconstruction even when the drive devices reshuffle. I also wonder
how to use the above method when I remove a drive and replace it with
a different sized drive at the same ID.
TIA.
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