Status

Status of path groups.

• Normal: There are no problems, the path group is usable.
• Disconnect: The path group has been intentionally disconnected.
• Checking: The system is checking the mapping path status.
• Unknown: The status of the mapping path is not known.
• Cache Destage: The writing of data from cache memory to the external volume is in progress.
• Warning: There are mapping paths whose status is not normal. You can check their status in the View External LUN Properties window.
• Blockade: The mapping path is blocked.
• Destage Failed: The writing of data from cache memory to the volume is failed.

Vendor / Model / Serial Number

Identifying information for the external system.

Number of External Paths

Number of external paths in the external path group.

Number of External Volumes

Number of mapped external volumes using the external path group.

External Volume Capacity

Total capacity of mapped external volumes using the path group.

Parity Group ID

Displays parity group numbers for the mapped external volumes. When the link is clicked, a list of LDEVs in the mapped volume and parity group displays.

When the link is clicked, a list of LDEVs in the mapped volume and parity group displays.

Status

Status of the external volume.

• Normal: There are no problems, the volume is usable.
• Disconnect: The external system or one of its mapped volumes has been intentionally disconnected.
• Checking: The system is checking the mapping path status
• Unknown: The status of the mapping path is not known.
• Cache Destage: Writing of data from cache memory to the volume is in progress.
• Warning: There are mapping paths whose status is not normal. You can check their status in the View External LUN Properties window.
• Blockade: The mapping path is blocked.
• Destage Failed: The writing of data from cache memory to the volume failed.

Top LDEV ID

External volume's top LDEV ID.

Top LDEV Name

External volume's top LDEV name.

Device Name

Product ID of Standard Inquiry. This is the name defined by the standard body that controls SCSI. This name varies according to the storage system vendor. For example, for some enterprise storage systems, this field displays the emulation type.

Number of LDEVs

Number of LDEVs created in the external volume.

Capacity

Capacity of the external volume.

Volume Properties

Identification number of the external volume.

The value is used by UVM to identify the LUN across multiple paths. The value is provided by the external system and might reflect internal numbering.

Device ID

Identification number of the external volume.

Drive Info

Information about the external volume's drive type.

SATA displays when the external volume is a SATA drive of the following storage systems:

• Virtual Storage Platform
• Universal Storage Platform V/VM
• HUS/AMS/WMS
• SMS
• Thunder 9500V

SSD displays when the external volume is the SSD of the following storage systems:

• VSP Gx00 models, VSP Fx00 models
• VSP G1x00 and VSP F1500
• HUS VM Storage Platform
• Virtual Storage Platform
• Universal Storage Platform V/VM

MP Unit ID

ID of the MP unit allocated to the external volume.

Path Mode

Path mode for the external volume's external path.

• Single: Ordinarily, only one external path is used even if alternate paths are set. Alternate paths are available in case of failure.
• Multi: Multiple paths are used at the same time.
• ALUA: Like Multi, all paths are used; however, they are not used when connected to ports in Passive status.

Path Mode on Profile¹

Displays the path mode on the profile information of the external storage system.

• Single: Ordinarily, only one external path is used even if alternate paths are set.
• Multi: When alternate paths are set, external paths from several ports are used simultaneously with load balancing.

ALUA Settable¹

Displays whether ALUA can be set as the Path Mode in the external storage system.

• Enable: Enables ALUA Mode.
• Disable: Disables ALUA Mode.

ALUA Permitted¹

Displays whether ALUA can be set as the Path Mode in the local storage system.

• Enable: ALUA Mode is used.

  Disable: ALUA Mode is not used.

Load Balance Mode

Displays I/O load balance system for external storage system.

• Normal Round-robin: Performs load balance in round-robin system.
• Extended Round-robin: Load balance system is automatically switched for sequential I/O and random I/O.
• Disable: Performs I/O operation with a single path, without load balance.

Cache Mode

Write data from the host to the external system is propagated synchronously (Disable) or asynchronously (Enable).

When nondisruptive migration is specified as the Attribute, the cache modes are displayed.

• Through: Transfers write and read requests from the host to the external storage system. The local system's cache is not used.
• Write Sync: Reflects write data from the host to the external storage system synchronously. If read or write is performed while data is being written to the external storage system, the read or write operation waits until the ongoing write operation is completed.
• Check Condition : Indicates that write or read commands from the host were rejected.
• Pending : Holds write and read commands from the host.

While cache mode operations are in progress, status is reported for cache mode changes.

• (Changing): Transition to the displayed cache mode is in progress.
• (Error): Transition to the displayed cache mode has failed and maintenance work is required.

Inflow Control

Write operation to cache memory is limited (Enable) or continued (Disable) when the write operation to the external volume cannot be performed.

Attribute

Displays the attribute of the parity group.

• Nondisruptive migration: Parity group that has the nondisruptive migration attribute
• A blank displays if no attribute is set.

Data Direct Mapped LDEV¹

Displays the LDEV ID of the mapped DP-VOL.

• If the Data Direct Mapping attribute is disabled, a hyphen is displayed.
• If a V-VOL that has the Data Direct Mapping attribute is not set to the pool that has the Data Direct Mapping attribute, a blank is displayed.

When clicked, launches the LDEV Properties window.

Add External Volumes

Displays the Add External Volumes window.

Edit External Volumes

Displays the Edit External Volumes window.

View External LUN Properties

View external system LUN information for the external volume, as well as external and mapping path information in the Displays the View External LUN Properties window.

Delete External Volumes²

When clicked, launches the Delete External Volumes window.

Disconnect External Volumes²

When clicked, launches the Disconnect External Volumes window.

Reconnect External Volumes²

When clicked, launches the Reconnect External Volumes window.

Assign MP Unit ²

When clicked, launches the Assign MP Unit window.

Edit Policies²

When clicked, launches the Edit Policies window.

Export²

When clicked, allows you to save table information to a file.

Notes:

1. Does not appear by default. To display the item, change the setting in the Column Settings window of the table option. See the Hitachi Device Manager - Storage Navigator User Guide for the details of the window.
2. Appears when you click More Actions.
3. If an MP unit is blocked due to a failure, the processing to be performed by the MP unit where the failure occurred is taken over by another MP unit. See Selected external path group window.

Priority

Priority of external paths.

Port ID

Displays the external port of the local storage system.

Type

Displays the port type.

• Fibre: Fibre Channel port
• iSCSI: iSCSI port

Virtual Port ID

Displays the virtual port of the local storage system.

External

Displays the information about the target port of the external storage system.

• IP Address: Displays the target port IP address when the port type is an iSCSI port.
• TCP Port Number^*: Displays the target TCP port number when the port type is an iSCSI port.
• WWN / iSCSI Target Name: Displays the WWN to show the target port when the port type is a Fibre Channel port. If the port type is iSCSI port, the iSCSI target name is displayed.

Status

Status of external paths.

• Normal: There are no problems, the system is usable.
• Disconnect: The path has been intentionally disconnected.
• Checking: The system is checking the external path status.
• Unknown: The status of the external path is not known.
• Warning: There are external paths whose status is not normal. You can check their status in the View External LUN Properties window.
• Blockade: The external path is blocked.

QDepth

Number of Read/Write commands that can be queued to the external volume. 8 is set by default.

When Load Balance Mode is Extended Round-robin and the I/Os issued to the external volume are sequential, the number of Read/Write commands that can be queued at one time is the total of the QDepth values of all the external paths.

I/O Timeout(sec.)

Number of seconds that should pass before I/O to the external volume times out. 15 seconds is the default.

Blocked Path Monitoring (sec.)

Time that will elapse from the time that a path goes down to the time when the external volume is blocked. 10 seconds is the default.

Edit External Path Configuration

When clicked, launches the Edit External Path Configuration window.

Edit Policies

When clicked, launches the Edit Policies window.

Export

When clicked, allows you to save table information to a file.

Notes:

* Does not appear by default. To display the item, change the settings in the Column Settings window. See the Hitachi Device Manager - Storage Navigator User Guide for the details of the window.