Supported external system path mode for external volumes

Universal Volume Manager User Guide

Version
9.8.7
Audience
anonymous
Part Number
MK-98RD9016-13

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.
CAUTION:
Depending on the external storage type and system configuration, performance might not be improved when Extended Round-robin is set. In that case, Normal Round-robin is 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

  • Path Mode: Multi
  • Displayed as VSP E series
Hitachi Virtual Storage Platform G350, G370, G700, G900

Hitachi Virtual Storage Platform F350, F370, F700, F900

  • Path Mode: Multi
  • Displayed as VSP Gx00

Hitachi Virtual Storage Platform G200, G400, G600, G800

Hitachi Virtual Storage Platform F400, F600, F800

  • Path Mode: Multi
  • Displayed as VSP Gx00

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

  • Path Mode: Multi
  • Displayed as VSP 5000 series
Hitachi Virtual Storage Platform G1000, G1500,

Hitachi Virtual Storage Platform F1500

  • Path Mode: Multi
  • Displayed as VSP G1000
Hitachi Unified Storage VM
  • Path Mode: Multi
  • Displayed as HUS VM
Hitachi Virtual Storage Platform
  • Path Mode: Multi
  • Displayed as VSP
Hitachi Universal Storage Platform V
  • Path Mode: Multi
  • Displayed as USP V
Hitachi Universal Storage Platform VM
  • Path Mode: Multi
  • Displayed as USP VM
Hitachi TagmaStoreâ„¢ Universal Storage Platform
  • Path Mode: Multi
  • Displayed as USP
Hitachi TagmaStore Network Storage Controller
  • Path Mode: Multi
  • Displayed as NSC
Hitachi Unified Storage
  • Path Mode: Multi
  • Displayed as HUS
Hitachi Adaptable Modular Storage
  • Path Mode:
    • Multi: AMS2500, AMS2300, AMS2100, and AMS2010
    • Single: AMS1000, AMS500, and AMS200
  • Displayed as AMS
Hitachi Workgroup Modular Storage
  • Path Mode: Single
  • Displayed as WMS
Hitachi Simple Modular Storage
  • Path Mode: Multi
  • Displayed as SMS
Hitachi Lightning 9900V Series
  • Path Mode: Multi
  • Displayed as 9970V or 9980V
Lightning 9900 Series
  • Path Mode: Multi
  • Displayed as:
    • Lightning 9960: 0400
    • Lightning 9910: 0401
Hitachi Thunder 9500V series
  • Path Mode: Single
  • Displayed as 9500V
Hitachi SANRISE Universal Storage Platform
  • Path Mode: Multi
  • Displayed as USP
Hitachi SANRISE Network Storage Controller
  • Path Mode: Multi
  • Displayed as NSC
Hitachi SANRISE 9900V series
  • Path Mode: Multi
  • Displayed as 9970V or 9980V
Hitachi SANRISE 9500V series
  • Path Mode: Single
  • Displayed as 9500V
Hitachi SANRISE 2000 series
  • Path Mode: Multi
  • Displayed as:
    • SANRISE 2800: 0400
    • SANRISE 2200: 0401
HP Virtual Storage Platform VX7
  • Path Mode: Multi
  • Displayed as XP7
HP Virtual Storage Platform VP9500
  • Path Mode: Multi
  • Displayed as P9500
A/H-6593
  • Path Mode: Multi
  • Displayed as 300
Hitachi Virtual Storage Software Block (VSS block)
  • Path Mode: ALUA
  • Displayed as VSS block
HP H24000
  • Path Mode: Multi
  • Displayed as 24000
HP H20000
  • Path Mode: Multi
  • Displayed as 20000
HP SANRISE H12000
  • Path Mode: Multi
  • Displayed as 12000
HP SANRISE H10000
  • Path Mode: Multi
  • Displayed as 10000
HP SANRISE H1024/ H128
  • Path Mode: Multi
  • Displayed as 1024 or 128
HP SANRISE H512/H48
  • Path Mode: Multi
  • Displayed as 512 or 48
HP SANRISE H256
  • Path Mode: Multi
  • Displayed as 256
HP XP8
  • Path Mode: Multi
  • Displayed as XP8
HP XP7
  • Path Mode: Multi
  • Displayed as XP7
HP StorageWorks P9500
  • Path Mode: Multi
  • Displayed as P9500
HP XP24000
  • Path Mode: Multi
  • Displayed as 24000
HP XP20000
  • Path Mode: Multi
  • Displayed as 20000
HP XP12000
  • Path Mode: Multi
  • Displayed as 12000
HP XP10000
  • Path Mode: Multi
  • Displayed as 10000
HP XP1024/XP128
  • Path Mode: Multi
  • Displayed as 1024 or 128
HP XP512/XP48
  • Path Mode: Multi
  • Displayed as 512 or 48
HP XP256
  • Path Mode: Multi
  • Displayed as 256
HP StorageWorks Enterprise Virtual Array 3000/4000/5000/600 0/8000
  • Path Mode: Single
  • Displayed as EVA
SVS200
  • Path Mode: Multi
  • Displayed as SVS200