Selected external path group window

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

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

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, the emulation type is displayed.

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: Drive type of external volumes is SATA.
• SSD,FMD: Drive type of external volumes is SSD or FMD.
• (For VSP 5000 series) SCM: Drive type of external volumes is SCM. SCM is displayed only when the SCM drive is mounted on a VSP 5000 series storage system. SSD, FMD is displayed, however, when the DKCMAIN program version is earlier than 90-04-04-00/00.

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.

See External paths for more information.

Path Mode on Profile

Not displayed by default. To display the item, change the setting in the Column Settings window of the table option.

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 Settable

Not displayed by default. To display the item, change the setting in the Column Settings window of the table option.

Whether ALUA can be set as the Path Mode in the external storage system:

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

ALUA Permitted

Not displayed by default. To display the item, change the setting in the Column Settings window of the table option.

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

I/O load balance system for external storage system:

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

Cache Mode

How write data from the host to the external system is propagated:

• Disable: synchronously
• Enable: asynchronously

When nondisruptive migration is specified as the attribute, the cache modes are displayed:

• Through: Write and read requests are transferred from the host to the external storage system. The local system's cache is not used.
• Write Sync: Write data is reflected 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 (VSP E series): Indicates that write or read commands from the host were rejected.
• Pending (VSP E series): 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

Attribute of the parity group:

• Nondisruptive migration: Parity group that has the nondisruptive migration attribute.
• (blank): No attribute is set.

Data Direct Mapped LDEV

Not displayed by default. To display the item, change the setting in the Column Settings window of the table option.

LDEV ID of the mapped DP-VOL:

• - (hyphen): Data Direct Mapping attribute is disabled.
• (blank): A V-VOL that has the Data Direct Mapping attribute is not set to the pool that has the Data Direct Mapping attribute.

When clicked, the LDEV Properties window is displayed.

Priority

Priority of external paths

Port ID

External port of the local storage system

External WWN

(VSP 5000 series) WWN of the external storage system. The external WWN shows the target port.

Type

Port type:

• Fibre: Fibre Channel port
• iSCSI: iSCSI port

Virtual Port ID

Virtual port of the local storage system

External

Information about the target port of the external storage system:

• IP Address: Target port IP address when the port type is an iSCSI port.
• TCP Port Number: Target TCP port number when the port type is an iSCSI port. Not displayed by default. To display the item, change the settings in the Column Settings window.
• WWN / iSCSI Target Name: WWN to show the target port when the port type is a Fibre Channel port. If the port type is iSCSI, 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.