System information

Using the RAID GUI
2-26
Add LUNs in a storage port
In the simple storage main screen, click Add to add a LUN to the default storage group of an FC port/
SAS port/SCSI port/iSCSI port, fcpx/sasy/scpz/isp, with a virtual disk.
Remove LUNs in storage port
Select the LUN(s) you want to remove and click Remove. To remove all LUNs of a virtual disk from the default storage
group of fcpx/sasy/scpz, check the ‘Remove mapping virtual disk from all storage group’ box.
• Symmetric method
Symmetric storage is used in environments where hosts are equipped with multi-path IO (MPIO) driver or software that
can handle multiple paths (LUNs) to a single virtual disk. Use the provided PathGuard package to install and use the
MPIO driver. For more information, see 5.1 Multi-Path IO Solutions.
In this case, the controller’s performance is highly elevated. You
need not consider different host ports because the bindings
between hosts and storage groups are applied to all host ports.
As the illustration shows, LUNs are assigned according to each
host’s WWPN (World Wide Port Name). Therefore, you need to set
the host WWPN first. Each host can recognize LUNs as paths to
virtual disks, instead of individual disks.
To set up symmetric storage groups, first add host(s).
HTP ID Each FC/SAS/SCSI port has a unique ID, which is determined according to the
physical location of the port on the controller. Select one from the drop-down
menu. For iSCSI port, at least an iSCSI target node is necessary for LUN
pressented.
SCSI ID (For SCSI port)
Select a SCSI ID from the drop-down menu. A maximum of 16 SCSI IDs can be
added to the controller.
LUN ID Select a LUN ID from the drop-down menu, where up to a maximum of 128
LUNs can be selected.
Mapping Virtual Disk Select a virtual disk from the drop-down menu for LUN mapping.
Sector Size 512Byte / 1KB / 2KB / 4KB
Select a sector size from the drop-down menu as the basic unit of data transfer
in a host.
Number of Cylinder / Number of
Head / Number of Sector
Define a specific cylinder, head, and sector to accommodate different host
systems and applications. The default is Auto.
Write Completion Write-behind: Write commands are reported as completed when a host’s data
is transferred to the write cache.
Write-through: Write commands are reported as completed only when a host’s
data has been written to disk.
FCP1
(Port1)
FCP2
(Port2)
LUN0
(DG0LD0)
LUN1
(DG0LD2)
LUN2
(VOL3)
LUN3
(JBOD2)
HOST
MPIO Environment
Figure 2-21 Symmetric storage