HP XP External Storage Software - Manual (Page 55)

Figure 24 Volume Operation List when Path Group is Clicked
The Volume Operation list consists of:
• External Volumes
The following items are displayed:
• ExG: external volume group number and reference number assigned to each volume in the
external volume group. This is displayed in the format of external volume group number ­
reference number of volume in the group. The reference numbers of volumes in the group are
automatically assigned by External Storage when the external volumes are mapped.
• LDEV: LDKC:CU:LDEV number* which is assigned to the external volume. When multiple
LDEVs are created in the external volume, the top LDEV number is displayed, and [...] is
displayed at the end of the number.
* LDKC: Logical Disk Controller
CU: Control Unit
• Characteristic1: identification number of the external volume.
• Device: product name that is reported to the host by the external volume. The displayed items
differs depending on the vendor of the storage system.
• Capacity (blocks): capacity of the external volume in Blocks.
• Cache Mode: displays whether the write data from the host to the external storage system is
propagated synchronously (Disable) or asynchronously (Enable).
• Inflow Control: displays whether the writing operation to the cache memory is stopped
(Enable) or continued (Disable) when the writing operation to the external volume is impossible.
• Path Mode: Indicates how the cross-subsystem paths work. The displayed modes of the
cross-subsystem path are as follows:
• Single: For the Single mode, the only cross-subsystem path with the highest priority
(primary path) is used to execute the I/O to the external volume. When an error occurred
in the primary path, the path with the second highest priority is used.
XP24000 External Storage Software User’s Guide 55