scsi_hostadapter3 qla2300
options scsi_mod max_scsi_luns=128
Adding FC disks dynamically
The commonly used way to discover newly attached DS6000 volumes is to unload and reload the Fibre Channel HBA driver. However, this action is disruptive to all applications that use Fibre Channel attached disks on this particular host.
A Linux system can recognize newly attached LUNs without unloading the FC HBA driver. The procedure slightly differs depending on the installed FC HBAs.
In case of QLogic HBAs issue the command:
echo
With Emulex HBAs, issue the command:
sh force_lpfc_scan.sh
This script is not part of the regular device driver package and must be downloaded separately:
http://www.emulex.com/ts/downloads/linuxfc/rel/201g/force_lpfc_scan.sh
It requires the tool dfc to be installed under /usr/sbin/lpfc.
In both cases the command must be issued for each installed HBA, with the
After the FC HBAs rescan the fabric, you can make the new devices available to the system with the command:
echo "scsi
The quadruple s c t l is the physical address of the device:
s is the SCSI instance of the FC HBA
c is the channel (in our case always 0)
t is the target address (usually 0, except if a volume is seen by a HBA more than once)
l is the LUN
The new volumes are added after the already existing ones. The following examples illustrate this. Example
Example: A-13 SCSi disks attached at system start time
/dev/sda - | internal SCSI disk | ||
/dev/sdb - | 1st DS6000 volume, seen by HBA 0 | ||
/dev/sdc - | 2nd DS6000 volume, seen by HBA 0 | ||
/dev/sdd | - | 1st DS6000 | volume, seen by HBA 1 |
/dev/sde | - | 2nd DS6000 | volume, seen by HBA 1 |
|
|
|
|
Example
Example:
/dev/sda - internal SCSI disk
/dev/sdb - 1st DS6000 volume, seen by HBA 0
