Single or Multi path mode displays in Device Manager - Storage Navigator for external volumes on the External Path Group window. Path modes are based on the external storage system and cannot be changed.
In ALUA mode, the storage system uses all paths that are defined. The storage system performs I/O operations for external volumes through load balancing with the use of several paths (round-robin control). The storage system does not use external paths connected to ports that are in Passive status.
Load Balance Mode
When the path mode of an external volume is Multi or ALUA, you can select an I/O mode for the external storage system.
- Depends on the selected external volume(s): If Enable is set for ALUA Settable on the external volume, Normal Round-robin is set for Load Balance Mode automatically. If Disable is set for ALUA Settable, Disable is set for Load Balance Mode automatically.
- Normal Round-robin: Normal multi-path I/O control system. This distributes I/O to several paths on which I/O operation is enabled for the external storage system. Specify this if Extended Round-robin might lower I/O performance. This mode is recommended when the number of sequential I/O operations is small.
- Extended Round-robin: Extended multi-path I/O control system. I/O is distributed to several paths on which I/O operation is enabled for the external storage system. For sequential I/O, the external volume is divided into sections at regular intervals. In this case, the same path is used for I/O within the same section, which reduces the frequency of I/O distribution. You can improve the read speed by using the cache function of the external storage system for sequential I/O operations. This mode is recommended when the number of sequential I/O operations is large.
- Disable: I/O operation is performed with only one path that is normal and has the highest priority. The same operation applies as that for Single path mode. When Disable is set for Load Balance Mode, load distribution is not performed. This mode is not recommended.
The following table shows the path mode for many of the supported external storage systems. The table also shows the abbreviation used in Device Manager - Storage Navigator. If your system is not shown below, refer to https://knowledge.hitachivantara.com/Documents.
For the specific settings for each external storage system, see Special settings required for certain supported external storage systems. If there is no description about the settings, the port of the external storage system that connects to the local storage system must be set as a target port. The target port connects to the Windows hosts. For detailed information, please contact the third party vendor.
External storage system | Reference |
---|---|
Hitachi Virtual Storage Platform E590 Hitachi Virtual Storage Platform 590H Hitachi Virtual Storage Platform E790 Hitachi Virtual Storage Platform 790H Hitachi Virtual Storage Platform E990 Hitachi Virtual Storage Platform E1090 Hitachi Virtual Storage Platform E1090H |
|
Hitachi Virtual Storage Platform G350, G370, G700,
G900 Hitachi Virtual Storage Platform F350, F370, F700, F900 |
|
Hitachi Virtual Storage Platform G200, G400, G600, G800 Hitachi Virtual Storage Platform F400, F600, F800 |
|
Hitachi Virtual Storage Platform 5100 Hitachi Virtual Storage Platform 5500 Hitachi Virtual Storage Platform 5100H Hitachi Virtual Storage Platform 5500H Hitachi Virtual Storage Platform 5200 Hitachi Virtual Storage Platform 5200H Hitachi Virtual Storage Platform 5600 Hitachi Virtual Storage Platform 5600H |
|
Hitachi Virtual Storage Platform G1000, G1500, Hitachi Virtual Storage Platform F1500 |
|
Hitachi Unified Storage VM |
|
Hitachi Virtual Storage Platform |
|
Hitachi Universal Storage Platform V |
|
Hitachi Universal Storage Platform VM |
|
Hitachi TagmaStoreâ„¢ Universal Storage Platform |
|
Hitachi TagmaStore Network Storage Controller |
|
Hitachi Unified Storage |
|
Hitachi Adaptable Modular Storage |
|
Hitachi Workgroup Modular Storage |
|
Hitachi Simple Modular Storage |
|
Hitachi Lightning 9900V Series |
|
Lightning 9900 Series |
|
Hitachi Thunder 9500V series |
|
Hitachi SANRISE Universal Storage Platform |
|
Hitachi SANRISE Network Storage Controller |
|
Hitachi SANRISE 9900V series |
|
Hitachi SANRISE 9500V series |
|
Hitachi SANRISE 2000 series |
|
HP Virtual Storage Platform VX7 |
|
HP Virtual Storage Platform VP9500 |
|
A/H-6593 |
|
Hitachi Virtual Storage Software Block (VSS block) |
|
HP H24000 |
|
HP H20000 |
|
HP SANRISE H12000 |
|
HP SANRISE H10000 |
|
HP SANRISE H1024/ H128 |
|
HP SANRISE H512/H48 |
|
HP SANRISE H256 |
|
HP XP8 |
|
HP XP7 |
|
HP StorageWorks P9500 |
|
HP XP24000 |
|
HP XP20000 |
|
HP XP12000 |
|
HP XP10000 |
|
HP XP1024/XP128 |
|
HP XP512/XP48 |
|
HP XP256 |
|
HP StorageWorks Enterprise Virtual Array 3000/4000/5000/600 0/8000 |
|
SVS200 |
|