Selected external path group window

Use this window to view the mapped external volumes using the external path, and view the external paths in the path group.

You can perform these operations from the window.

Mapping an external volume

Edit Cache Mode and Inflow Control settings for individual mapped volumes (see Editing mapping policies )

View path status and external LUN information (see the Status description in the External Storage Systems tab section.)

Deleting external volume mapping

Disconnecting a single mapped volume

Reconnecting a single mapped volume

Changing the MP Unit of an external volume

Editing mapping policies

Export table information to a file (see the Export button description in External Storage Systems tab section.)

Information areas in this window:

Summary

Mapped Volumes tab

External Paths tab

Summary

Displays summary information about the selected external path group.


Item	Description
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.

Mapped Volumes tab

Displays the external volumes mapped to the Virtual Storage Platform G200, G400, G600 using the selected path group.


Item	Description
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 Hitachi enterprise storage, this field displays the emulation type.
Number of LDEVs	Number of LDEVs created in the external volume.
Capacity	Capacity of the external volume.
Characteristic1	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 may reflect internal numbering.
Characteristic2	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 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 following storage systems. Virtual Storage Platform G200, G400, G600 Virtual Storage Platform G1000 HUS VM Storage Platform Virtual Storage Platform Universal Storage Platform V/VM
MP Unit ID³	MP unit IDs 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. 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 attribute parity group. nondisruptive migration: Parity group with the nondisruptive migration attribute A blank displays if no attribute is set.
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 Unit²	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: Does not appear by default. To display the item, change the setting in the Column Settings window of the table option. See the System Administrator Guide for the details of the window. Appears when you click More Actions. 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 MP unit priorites after takeover for priorities assumed by MP unit after takeover.

MP unit priorites after takeover


Failed MP unit	Priorities assumed by MP units after takeover
Failed MP unit	1st	2nd	3rd
MPU10	MPU11	MPU21	MPU20
MPU11	MPU10	MPU20	MPU21
MPU20	MPU21	MPU11	MPU10
MPU21	MPU20	MPU10	MPU11

External Paths tab

Displays the external paths within the selected path group.


Item	Description
Priority	Priority of external paths.
Port ID	Port connected to the external storage system of the local storage system.
External WWN	External system port identification number.
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.
Path Blockade Watch(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.