Host Response

Overview
User Privileges
Display Contents

Overview

This function displays the host responses that are registered in the storage system.

The host response configures the appropriate operation mode on which the host makes connection. The usual host connection uses a recommended pattern or the default setting which have been arranged in advance in accordance with each OS type.

Use the [Add Host Response] function when customizing the host response in accordance with the OS type or the operating environment.

User Privileges

Availability of Executions in the Default Role

Default role	Availability of executions
Monitor
Admin
StorageAdmin
AccountAdmin
SecurityAdmin
Maintainer

Refer to User Roles and Policies for details on the policies and roles.

Display Contents

In this screen, the list of host responses are displayed.

Item	Description
Name	All of the host response names that have been registered in the storage system are displayed. Click the host response name to display the [Host Response Detail] Screen. Default Solaris MPxIO HP-UX AIX AIX VxVM VS850/SVC BS2000
Status	The usage of the host response ("Active" or "Inactive") is displayed. Active A host response which is being used on host, host group, or host affinity. Inactive A host response which is not being used on host, host group, or host affinity.

Item

Description

Name

All of the host response names that have been registered in the storage system are displayed.

Click the host response name to display the [Host Response Detail] Screen.

Default

Solaris MPxIO

HP-UX

AIX

AIX VxVM

VS850/SVC

BS2000

Status

The usage of the host response ("Active" or "Inactive") is displayed.

Active

A host response which is being used on host, host group, or host affinity.
Inactive

A host response which is not being used on host, host group, or host affinity.

[Host Response Detail] Screen

The setting parameters for registered host responses are displayed.

Host Response Name

Item	Description
Name	The selected host response name is displayed. Default Solaris MPxIO HP-UX AIX AIX VxVM VS850/SVC BS2000

LUN Settings

Item	Description
LUN Addressing	The LUN addressing format is displayed. Peripheral device addressing (Default) This mode enables mapping to 256 LUNs. Flat space addressing This mode enables mapping to 4096 LUNs.
LUN Expand Mode (Peripheral Device Addressing)	The LUN expand mode of the Peripheral Device Addressing is displayed. Enable Expand the number of LUNs that can be mapped using the Peripheral Device Addressing method to 4096. Disable (Default) Do not Expand the number of LUNs that can be mapped using the Peripheral Device Addressing method (not changed from 256 maximum). Note This parameter is only available when the LUN addressing setting is "Peripheral device addressing (Default)".

Item

Description

LUN Addressing

The LUN addressing format is displayed.

Peripheral device addressing (Default)

This mode enables mapping to 256 LUNs.
Flat space addressing

This mode enables mapping to 4096 LUNs.

LUN Expand Mode

(Peripheral Device Addressing)

The LUN expand mode of the Peripheral Device Addressing is displayed.

Enable

Expand the number of LUNs that can be mapped using the Peripheral Device Addressing method to 4096.
Disable (Default)

Do not Expand the number of LUNs that can be mapped using the Peripheral Device Addressing method (not changed from 256 maximum).

Note

This parameter is only available when the LUN addressing setting is "Peripheral device addressing (Default)".

ALUA Settings

Item	Description
Asymmetric / Symmetric Logical Unit Access	The access type from the host to a volume is displayed. ACTIVE-ACTIVE / PREFERRED_PATH There are recommended paths and non-recommended paths for each volume. By using a CA port in the Controlling CM of a RAID group in which the volume belongs for the recommended paths (other ports are regarded as non-recommended paths), data migration between CMs (cross access) can be reduced. ACTIVE / ACTIVE All of the paths to the volume are regarded as being recommended paths. The multipath driver determines which paths are used. For the ETERNUS DX900 S5 or the ETERNUS DX8900 S4: ACTIVE-ACTIVE / PREFERRED_PATH ACTIVE / ACTIVE (Default) For the other models: ACTIVE-ACTIVE / PREFERRED_PATH (Default) ACTIVE / ACTIVE Caution This item is only available when the TPGS mode is "Enabled (Default)". Note that this parameter is enabled regardless of the TPGS mode setting when the ETERNUS Multipath Driver is used. For storage systems other than the ETERNUS DX900 S5 or the ETERNUS DX8900 S4, when setting "ACTIVE / ACTIVE", a data migration occurs between CMs and there may be a reduction in performance.
TPGS Mode	The Target Port Group Support (TPGS) mode is displayed. TPGS is a standard that is used to achieve Asymmetric Logical Unit Access (ALUA) for multipath control. By notifying the path status (recommend or non-recommend) of each volume, the selection conditions of paths for multipath control can be determined. If the TPGS mode is "Disabled", the multipath driver determines which paths are used. Enabled (Default) Disabled
TPG Referrals Mode	The TPG Referrals mode is displayed. The TPG Referrals function determines the priority path for each block when accessing volumes via the ETERNUS Multipath Driver in order to prevent cross access. Enabled Disabled (Default) Caution The TPG Referrals function is performed when "Enabled" is selected and all of the following conditions apply: The ETERNUS Multipath Driver supports the TPG Referrals function The TPGS mode is "Enabled (Default)" This parameter is available for Standard, WSV, TPV, FTV, and Standard (LUN Concatenation) type volumes. This mode is effective for WSVs, TPVs, FTVs, and Standard (LUN Concatenation) type volumes when RAID groups are configured with different controlling CMs.

Item

Description

Asymmetric / Symmetric Logical Unit Access

The access type from the host to a volume is displayed.

ACTIVE-ACTIVE / PREFERRED_PATH

There are recommended paths and non-recommended paths for each volume. By using a CA port in the Controlling CM of a RAID group in which the volume belongs for the recommended paths (other ports are regarded as non-recommended paths), data migration between CMs (cross access) can be reduced.
ACTIVE / ACTIVE

All of the paths to the volume are regarded as being recommended paths. The multipath driver determines which paths are used.

For the ETERNUS DX900 S5 or the ETERNUS DX8900 S4:

ACTIVE-ACTIVE / PREFERRED_PATH

ACTIVE / ACTIVE (Default)

For the other models:

ACTIVE-ACTIVE / PREFERRED_PATH (Default)

ACTIVE / ACTIVE

Caution

This item is only available when the TPGS mode is "Enabled (Default)". Note that this parameter is enabled regardless of the TPGS mode setting when the ETERNUS Multipath Driver is used.
For storage systems other than the ETERNUS DX900 S5 or the ETERNUS DX8900 S4, when setting "ACTIVE / ACTIVE", a data migration occurs between CMs and there may be a reduction in performance.

TPGS Mode

The Target Port Group Support (TPGS) mode is displayed.

TPGS is a standard that is used to achieve Asymmetric Logical Unit Access (ALUA) for multipath control. By notifying the path status (recommend or non-recommend) of each volume, the selection conditions of paths for multipath control can be determined. If the TPGS mode is "Disabled", the multipath driver determines which paths are used.

Enabled (Default)

Disabled

TPG Referrals Mode

The TPG Referrals mode is displayed.

The TPG Referrals function determines the priority path for each block when accessing volumes via the ETERNUS Multipath Driver in order to prevent cross access.

Enabled

Disabled (Default)

Caution

The TPG Referrals function is performed when "Enabled" is selected and all of the following conditions apply:
- The ETERNUS Multipath Driver supports the TPG Referrals function
- The TPGS mode is "Enabled (Default)"
This parameter is available for Standard, WSV, TPV, FTV, and Standard (LUN Concatenation) type volumes. This mode is effective for WSVs, TPVs, FTVs, and Standard (LUN Concatenation) type volumes when RAID groups are configured with different controlling CMs.

Inquiry Command Settings

Item	Description
Peripheral Device Type (Peripheral Device Addressing)	When the LUN addressing setting is "Peripheral device addressing (Default)", the Peripheral Device type for unconnected LUNs is displayed. No Device Type (3Fh) (Default) Not Supported (7Fh) Not Connected (20h)
Peripheral Device Type (Flat Space Addressing)	When the LUN addressing setting is "Flat space addressing", the Peripheral Device type for LUN0 is displayed. No Device Type (3Fh) (Default) Controller Device (0Ch)
SCSI Version	The version for the SCSI specification that is responded to the host is displayed. Version 6 (Default) Version 5 Version 4 Version 3
NACA	The respond mode for the Normal Auto Contingent Allegiance (NACA) bit is displayed. Enabled The host is responded to with the NACA bit on. Disabled (Default) The host is responded to with the NACA bit off.
Device ID Type	The format of the volume identification information is displayed. Type3 (Default) Type1 Type1 + Type3
Product ID	The product ID that is responded to the host is displayed. Default Respond as ETERNUS DX S2
Product Revision	Whether to respond with the firmware version as the product revision is displayed. Respond Not Respond (Default)

Item

Description

Peripheral Device Type

(Peripheral Device Addressing)

When the LUN addressing setting is "Peripheral device addressing (Default)", the Peripheral Device type for unconnected LUNs is displayed.

No Device Type (3Fh) (Default)

Not Supported (7Fh)

Not Connected (20h)

Peripheral Device Type

(Flat Space Addressing)

When the LUN addressing setting is "Flat space addressing", the Peripheral Device type for LUN0 is displayed.

No Device Type (3Fh) (Default)

Controller Device (0Ch)

SCSI Version

The version for the SCSI specification that is responded to the host is displayed.

Version 6 (Default)

Version 5

Version 4

Version 3

NACA

The respond mode for the Normal Auto Contingent Allegiance (NACA) bit is displayed.

Enabled

The host is responded to with the NACA bit on.
Disabled (Default)

The host is responded to with the NACA bit off.

Device ID Type

The format of the volume identification information is displayed.

Type3 (Default)

Type1

Type1 + Type3

Product ID

The product ID that is responded to the host is displayed.

Default

Respond as ETERNUS DX S2

Product Revision

Whether to respond with the firmware version as the product revision is displayed.

Respond

Not Respond (Default)

Test Unit Ready Command Settings

Item	Description
Reservation Conflict Response	Whether the TEST UNIT READY command for the reserved volume is responded to with the RESERVATION CONFLICT status is displayed. GOOD (Default) The TEST UNIT READY command is executed. If the target volume is in the normal state, responds with the GOOD status. RESERVATION CONFLICT The TEST UNIT READY command is responded to with the RESERVATION CONFLICT status.

Item

Description

Reservation Conflict Response

Whether the TEST UNIT READY command for the reserved volume is responded to with the RESERVATION CONFLICT status is displayed.

GOOD (Default)

The TEST UNIT READY command is executed. If the target volume is in the normal state, responds with the GOOD status.
RESERVATION CONFLICT

The TEST UNIT READY command is responded to with the RESERVATION CONFLICT status.

Sense Settings

Item		Description
Notify Change of Volume Mapping		Whether sense is reported to the host when volumes are added to LUN groups set with host affinity is displayed. Enabled (Default) Sense is notified. Disabled Sense is not notified.
Notify Change of Volume Expansion		Whether sense is reported to the host when the volume capacity is changed is displayed. Enabled (Default) Sense is notified. Disabled Sense is not notified.
Notify Vendor Unique Sense		Whether asynchronous sense is reported to the host when an event such as a module disconnection occurs in the storage system is displayed. Enabled Sense is notified. Disabled (Default) Sense is not notified.
Sense Data Conversion		Whether or not unconverted sense data is sent to the host is displayed. No Conversion (Default) Sense data is sent to the host without any conversion. Customize Customized sense data is sent to the host.
Sense Data Conversion	From SK/ASC/ASCQ	When sense data is converted, the sense data conversion pattern is displayed. "From SK/ASC/ASCQ" and "To SK/ASC/ASCQ" values are displayed in pairs. The sense data that matches the "From SK/ASC/ASCQ" value is changed to the "To SK/ASC/ASCQ" value. For non-conversion target items, "*" is displayed. Sense Key (SK): SK indicates sense keys included in the sense data. Additional Sense Code (ASC): ASC indicates sense codes included in the sense data. Additional Sense Code Qualifier (ASCQ): ASCQ indicates additional sense code qualifiers included in the sense data.
Sense Data Conversion	To SK/ASC/ASCQ

Mode Sense Command Settings

Item	Description
Reservation Conflict Response (Write Exclusive)	The response status when the "Mode Sense" command to the volume is received while the relevant volume is reserved with "Write Exclusive" by the host is displayed. "Write Exclusive" is a reservation type. Refer to the [Reservation] function for details. GOOD RESERVATION CONFLICT (Default)

Item

Description

Reservation Conflict Response (Write Exclusive)

The response status when the "Mode Sense" command to the volume is received while the relevant volume is reserved with "Write Exclusive" by the host is displayed.

"Write Exclusive" is a reservation type. Refer to the [Reservation] function for details.

GOOD

RESERVATION CONFLICT (Default)

Other Settings

Item	Description
Command Monitor Time	The time before the command timed out is displayed. If a timeout occurs, the relevant command ends abnormally with a specific sense code. Default (25sec.) A timeout occurs after 25 seconds. Customize A timeout occurs after the specified value (10 - 255 seconds).
Load Balance Response Status	The response status of the load balancing function is displayed. CHECK CONDITION / UNIT ATTENTION (Default) BUSY TASK SET FULL Caution This item is only available when "Enable" is selected for "Load Balance" in the subsystem parameter.
iSCSI Discovery Reply Mode	The response mode for iSCSI Discovery requests is displayed. All - Reply All Ports (Default) Replies to the host with the information for all the iSCSI ports (iSCSI names and IP addresses). Port - Reply Target Port Only Replies to the host with only the information for the specified iSCSI ports (iSCSI names and IP addresses).
iSCSI Reservation Range	The reservation management range for iSCSI connection is displayed. Storage System (Default) The reservation status of volumes is managed for each storage system. CA Port The reservation status of volumes is managed for each CA port.