On Wed, 20 Apr 2005, Rajat Jain, Noida wrote:
>
> The driver documentstion says it has the "qlascan" command which can help in
> adding new disks by the following procedure:
>
> 1) First add the Disk to the HBA.
> 2) # echo "scsi-qlascan" > /proc/scsi/<driver-name>/<adapter-id> (The
> qla2xxx driver will rescan)
FYI: these /proc interfaces are not present in the mainline
(upstream) qla2xxx driver. Besides, typically these steps are only
needed if the topology isolates a LIP or SCN. If the additional
device causes an RSCN (in the case of a fabric environment) to
propagate from the switch, the HBA will perform an SNS discovery and
login to the device.
Another alternative to forcing a LIP (and subsequently cause a
rescan), would be to initiate a bus-reset via sg_reset:
# sg_reset -b /dev/sg0
The only downside is the /dev/sg0 device-node requirement.
> 3) # echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi (The mid-level
> will add the device)
>
Yes, this will instruct the mid-layer to perform its own scan.
> However, what I wanted to know was that how can I REMOVE a SCSI device from
> the HBA at run time? By logic, I believe that the sequence should be:
>
> 1) # echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi (The
> mid-level will remove the device)
This is the only step that is needed.
> 2) Then remove the Disk from the HBA.
> 3) # echo "scsi-qlascan" > /proc/scsi/<driver-name>/<adapter-id> (The
> qla2xxx driver will rescan, and will remove the disk)
>
No, the HBA's recognition of the device persists throughout the
driver's lifetime -- this is not necessary.
Hope this helps.
Regards,
Andrew Vasquez
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