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 - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
