Hotplug SCSI disks + FC3 (2nd try)
T. Horsnell
tsh at mrc-lmb.cam.ac.uk
Wed Apr 13 10:31:05 UTC 2005
>On Tuesday 12 April 2005 11:21 am, T. Horsnell wrote:
>> I'm still flailing around trying to understand why hotplugging
>> my SCSI disks doesnt work. 2.6.10 kernel, and the disks are seen
>> OK after a system boot. However any disks which are plugged
>> in with the system running, dont seem to generate any hotplug
>> activity (checked by modifying /bin/hotplug script to write to
>> a file when it runs).
>>
>> Should hotplugging SCSI disks work with 2.6.10 kernel?
>> If not, can anyone suggest how I might make the system see
>> the new disks without rebooting? I've tried kudzu with no
>> success (should *that* have worked?)
>
>No. Unless you use special hardware (hot plug chassis with enclosure
>management), the generic SCSI bus does not detect "plugs". In addition, hot
>plugging can be dangerous. If there is data I/O going on on the SCSI bus at
>the time you plug, you risk causing data corruption. USUALLY this will be
>detected as a bus parity error, or other failures which get retried. But if
>it doesn't...
>
>> Is there some other way to force a SCSI-bus scan?
>> (I see ../drivers/scsi/scsi_scan.c in the kernel source)
>
>If you look at the SCSI how to (www.tldp.org), it makes reference to a
>command, something like "echo 'magic incantation' > /proc/scsi/...". This
>causes the specified device to be added to the internal tables. I don't
>recall a rescan command, but I haven't looked in a while. If there is, it
>would most likely be a similar echo command. It should be in the same SCSI
>how to.
>
Thanks for this Rick. I'm making a start on moving about 100 SCSI
disks from my Alpha system onto a dual Opteron one. Ive been hot-swapping
SCSI on the Alpha for many years, so I guess I've been spoiled.
I didnt properly research hotplug SCSI on Linux before I started :(
Cheers,
Terry.
>> Thanks,
>> Terry.
>
>Your welcome,
> --rick
>
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