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Openfiler SAN Configuration - more

We want our DAS server to access all the storage in the default group. In the terminology of SCST, the DAS server’s HBA, identified by its WWN, is a user (Figure 11). You’ll need the port name (the WWN) that we wrote down when we configured Windows box using SanSurfer above.

Add DAS server HBA to default group:

scstadmin –adduser  <DAS WWN>  -group Default

Add DAS HBA as a User

Figure 11: Add DAS HBA as a User

The configuration is almost complete, we have to write our configuration out to the config file /etc/scst.conf, so SCST can use it whenever we restart our SAN.

scstadmin –writeconfig  /etc/scst.conf

By default, our HBA is disabled in the SCST configuration file, we need to enable it by moving the host entry, our SAN HBA, to the list of enabled targets. Do this by editing the /etc/scst.conf and cutting and pasting the entry (Figure 12).

Enabling HBA as Target

Figure 12: Enabling HBA as Target

We are done configuring SCST. Your scst.conf file should look like the listing below.

# Automatically generated by SCST Configurator v1.0.11.
# NOTE: Options are pipe (|) seperated.
# Copy configuration options during a -writeconfig
# For FC targets, issue a LIP after every assignment change
[HANDLER vdisk]
#DEVICE <vdisk name>,<device path>,<options>,<block size>,<t10 device id>
DEVICE SAN_LUN0,/dev/san/fiberarray,WRITE_THROUGH,512,SAN_LUN0 df0abcfc
[HANDLER vcdrom]
#DEVICE <vdisk name>,<device path>
[GROUP Default]
#USER <user wwn>
USER 21:00:00:1B:32:0E:5D:91
#DEVICE <device name>,<lun>,<options>
[TARGETS enable]
#HOST <wwn identifier>
HOST 21:00:00:e0:8b:9d:63:ae
[TARGETS disable]
#HOST <wwn identifier>

We have one last change to make before we are done. We have to change the QLogic default driver kernel module, qla2xxx, so that of the QLogic target driver module, qla2x00tgt, is loaded instead. 

To do this you need to edit the module configuration file, modprobe.conf in the etc directory, changing qla2xxx to qla2x00tgt. When you are done editing, the file should look like the listing below.

alias eth0 e1000
alias eth1 e1000
alias scsi_hostadapter1 3w-9xxx
alias scsi_hostadapter2 ata_piix
alias usb-controller uhci-hcd
alias usb-controller1 ehci-hcd
alias scsi_hostadapter3 qla2x00tgt

That’s it, all done. We are ready to fire up our Old Shuck for the first time. Go ahead and reboot your SAN server, once it is back up, your SAN server should be visible to your Windows DAS box.

After the reboot, SANSurfer should be able to see the disks – take a look in the left hand pane, select LUN 0. It should look like Figure 15.

SANSurfer LUN 0

Figure 15: SANSurfer LUN 0

If you cannot see your disk as LUN 0, go back through your configuration, verify both scst.conf and modprobe.conf, especially the WWNs, which are easy to mistype.

Configuring The SAN On The DAS Server

We can now configure our disk. Highlight ‘Port 1’ in the left pane of SANSurfer; in the left pane you should see a tab called Target Persistent Binding (Figure 16), select it, and check the Bind All box and click Save. We are done with SANSurfer now, so quit.

Target Persistent Binding Tab

Figure 16: Target Persistent Binding Tab

The rest of the configuration is standard Windows, and your SAN is just a very large disk. Under Control Panel -> System and Security -> Administrative Tools bring up the Disk Management tool (Figure 17).

Windows Disk Management Tool

Figure 17: Windows Disk Management Tool

Go ahead and initialize and format the disk. You can then change to properties to share the disk to your network, making your DAS server a logical NAS.

See Figure 18, Cool, right?

Figure 18: Shared SAN Disk

With everything set, let’s buckle in and take a look at performance.

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