HMO Storage
System Function Host
mode Comments
2 HUS VM
VSP USP V/VM
Veritas DBE+RAC
(1) The response of Test Unit Ready(TUR) for Persistent Reserve is changed.
(2) According to the SCSI-3 specification, Reservation Conflict is responded to the TUR issued via the path without
Reservation Key registered,
(3) Setting HMO 02 to ON enables the TUR to perform
normally, which is issued via the path without Reservation Key registered and to which Reservation Key used to be responded.
Note: HMO 02 is required when the Veritas DBE for Oracle RAC(I/O Fencing) function is in use.
Common Mandatory.
Parameter Setting Failure for TPRLO.
Select HMO 6 when all of the following conditions are satisfied:
You are using the Emulex® host bus adapter and mini-port driver, and
You specify TPRLO=2 for the host bus adaptor mini-port driver.
x0C, x2C Optional
System mode
7 HUS VM
VSP USP V/VM
Changes the setting of whether to return the Unit Attention response when adding a LUN.
ON: Unit Attention response is returned.
OFF (default): Unit Attention response is not returned.
Sense code: REPORTED LUNS DATA HAS CHANGED Notes:
1. Set host mode option 07 to ON when you expect the REPORTED LUNS DATA HAS CHANGED UA at SCSI path change.
2. If the Unit Attention report occurs frequently and the load on the host side becomes high, the data transfer cannot be started on the host side and timeout may occur.
3. If both HMO 07 and HMO 69 are set to ON, the UA of HMO 69 is returned to the host.
Common VSP, HUS VM:
Provides SIM notification when the number of link failures
detected between ports exceeds the threshold. Common Optional Configure HMO 13 only when you are requested to do so.
22 HUS VM
VSP USP V/VM
When a reserved volume receives a Mode Sense command from a node that is not reserving this volume, the host will receive the following responses from the storage system:
ON: Normal Response.
OFF: Reservation Conflict (Default).
Notes:
1. By applying HMO 22, the volume status (reserved/non-reserved) is checked more frequently (several tens of milliseconds per LU).
2. By applying HMO 22, the host OS does not receive warning messages when a Mode Select command is issued to a reserved volume.
3. There is no influence to Veritas Cluster Server software when HMO 22 is set OFF. Enable HMO 22 ON when there are numerous reservation conflicts.
4. Set HMO 22 ON when Veritas Cluster Server is connected.
Common USP V/VM:
60-02-52-00/00 or later (within 60-02-5x range) 60-03-2x-00/00 or later
System mode
39 HUS VM
VSP USP V/VM
Resets a job and returns UA to all the initiators connected to the host group where Target Reset has occurred.
ON:
Job reset range: Reset is performed to the jobs of all the Initiators connected to the host group where Target Reset has occurred.
UA set range: UA is returned to all the Initiators connected to the host group where Target Reset has occurred.
OFF (default):
Job reset range: Reset is performed to the jobs of the initiator that has issued Target Reset.
UA set range: UA is returned to the initiator that has issued Target Reset.
Note: This option is used in the SVC environment, and the job reset range and UA set range need to be controlled per host group when Target Reset has been received.
Common USP V/VM:
Controls whether UA is returned to the host when a command from the host is received for an LU whose capacity has been expanded.
ON: When a command from the host is received for an LU whose capacity has been expanded, UA is returned to the host.
OFF (default): When a command from the host is received for an LU whose capacity has been expanded, UA is not returned to the host.
Note: This option is applied when UA returning to the host is required after the DP-VOL capacity is expanded.
x0C, x2C USP V/VM:
Gives priority to starting Inquiry/ Report LUN issued from the host where this option is set.
ON: Inquiry/ Report LUN is started by priority.
OFF (default): The operation is the same as before.
Common USP V/VM: 60-03-24-00/00 or later
42 USP V/VM Controls the behavior when CHA PCI is accessed from MP and when the status is busy.
ON: The PCI retry is not returned, and the PCI bus is occupied.
OFF (default): The PCI retry is returned.
Note: When IBM Z10 Linux is connected, set this mode to ON.
In other cases, set the mode to OFF.
x2C USP V/VM: 60-03-24-00/00 or later
System mode 48 USP V/VM By setting this option to ON, in normal operation, the pair
status of S-VOL is not changed to SSWS even when Read commands exceeding the threshold (1,000/6 min) are issued while a specific application is used.
ON: The pair status of S-VOL is not changed to SSWS if Read commands exceeding the threshold are issued.
OFF (default): The pair status of S-VOL is changed to SSWS if Read commands exceeding the threshold are issued.
Note:
1. Set this option to ON for the host group if the transition of the pair status to SSWS is not desired in the case that an application that issues Read commands (*1) exceeding the threshold (1,000/6 min) to S-VOL is used in HAM
environment.
*1: Currently, the vxdisksetup command of Solaris VxVM serves.
2. Even when a failure occurs in P-VOL, if this option is set to ON, which means that the pair status of S-VOL is not changed to SSWS (*2), the response time of Read command to the S-VOL whose pair status remains as Pair takes several msecs.
On the other hand, if the option is set to OFF, the response time of Read command to the S-VOL is recovered to be equal to that to P-VOL by judging that an error occurs in the P-VOL when Read commands exceeding the threshold are issued.
*2: Until the S-VOL receives a Write command, the pair status of S-VOL is not changed to SSWS.
Common USP V/VM:
60-06-10-00/10 or later (within 60-06-1x range) 60-06-21-00/00 or later
System mode
49 HUS VM
VSP USP V/VM
Selects BB_Credit value. (HMO#49: Low_bit) ON: BB_Credit value of 80 or 255.
OFF (default): BB_Credit value of 40 or 128.
*HMO50/HMO49: BB_Credit value is decided by 2 bits of the two HMOs.
00: Existing mode (BB_Credit value = 40) 01: BB_Credit value = 80
10: BB_Credit value = 128 11: BB_Credit value = 255
Note: Apply this HMO when the two conditions below are met:
Data frame transfer in long distance connection exceeds the BB_Credit value.
System option mode 769 is set to OFF (retry operation is enabled at TC/UR path creation).
VSP, HUS VM:
1. When HMO 49 is set to ON, SSB log of link down is output on MCU (M-DKC) and RCU (R-DKC).
2. This HMO works only when the microprogram supporting this function is installed on both MCU and RCU.
3. The HMO setting is only applied to Initiator-Port and RCU Target-Port. This function is only applicable when the 8UFC or 16UFC PCB is used on RCU/MCU.
4. If this option is used, Point to Point setting is necessary.
5. When removing the 8UFC or 16UFC PCB, the operation must be executed after setting HMO 49 to OFF.
6. If HMO 49 is set to ON while SOM 769 is ON, path creation may fail after automatic port switching.
7. Make sure to set HMO 49 from OFF to ON or from ON to OFF after the pair is suspended or when the load is low.
8. The RCU Target, which is connected with the MCU where this mode is set to ON, cannot be used for UR.
9. This function is prepared for long distance data transfer.
Therefore, if HMO49 is set to ON with distance of 0 km, a data transfer error may occur on RCU side.
USP V/VM:
1. When HMO 49 is set to ON, SSB log of link down is output on MCU (M-DKC).
2. This HMO works only when the microprogram supporting this function is installed on both MCU (M-DKC) and RCU (R-DKC).
3. The HMO setting is applied to Initiator-Port. This function is applicable only when the 8US PCB is used on RCU/MCU.
4. If this option is used, Point to Point setting is necessary.
5. When removing the 8US PCB, the operation must be executed after setting the HMO 49 to OFF.
6. If HMO 49 is set to ON while SOM 769 is ON, path creation may fail after automatic port switching.
7. Make sure to set HMO 49 from OFF to ON or from ON to OFF after the pair is suspended or when the load is low.
8. The RCU Target, which is connected with the MCU where this mode is set to ON, cannot be used for UR.
9. This function is prepared for long distance data transfer.
Therefore, if HMO49 is set to ON with distance of 0 km, a data transfer error may occur on RCU side.
Common VSP:
System mode
50 HUS VM
VSP USP V/VM
Selects BB_Credit value. (HMO#50: High_bit) ON: BB_Credit value of 128 or 255.
OFF (default): BB_Credit value of 40 or 80.
*HMO#50/HMO#49: BB_Credit value is decided by 2 bits of the two HMO.
00: Existing mode (BB_Credit value = 40) 01: BB_Credit value = 80
10: BB_Credit value = 128 11: BB_Credit value = 255
Note: Apply this option when two conditions below are met:
Data frame transfer in long distance connection exceeds the BB_Credit value.
System option mode 769 is set to OFF (retry operation is enabled at TC/UR path creation).
VSP, HUS VM:
1. When HMO 50 is set to ON, SSB log of link down is output on MCU (M-DKC) and RCU (R-DKC).
2. This HMO works only when the microprogram supporting this function is installed on both MCU (M-DKC) and RCU (R-DKC).
3. The HMO setting is only applied to Initiator-Port and RCU Target-Port. This function is only applicable when the 8UFC or 16UFC PCB is used on RCU/MCU.
4. If this option is used, Point to Point setting is necessary.
5. When removing the 8UFC or 16UFC PCB, the operation must be executed after setting HMO 50 to OFF.
6. If HMO 50 is set to ON while SOM 769 is ON, path creation may fail after automatic port switching.
7. Make sure to set HMO 50 from OFF to ON or from ON to OFF after the pair is suspended or when the load is low.
8. The RCU Target, which is connected with the MCU where this mode is set to ON, cannot be used for UR.
9. This function is prepared for long distance data transfer.
Therefore, if HMO49 is set to ON with distance of 0 km, a data transfer error may occur on RCU side.
USP V/VM:
1. When HMO 50 is set to ON, SSB log of link down is output on MCU (M-DKC).
2. This HMO works only when the microprogram supporting this function is installed on both MCU (M-DKC) and RCU (R-DKC).
3. The HMO setting is applied to Initiator-Port. This function is only applicable when the 8US PCB is used on RCU/MCU.
4. If this option is used, Point to Point setting is necessary.
5. When removing 8US PCB, the operation must be executed after setting the HMO 50 to OFF.
6. If HMO 50 is set to ON while SOM 769 is ON, path creation may fail after automatic port switching.
7. Make sure to set HMO 50 from OFF to ON or from ON to OFF after the pair is suspended or when the load is low.
8. The RCU Target, which is connected with the MCU where this mode is set to ON, cannot be used for UR.
9. This function is prepared for long distance data transfer.
Therefore, if HMO49 is set to ON with distance of 0 km, a data transfer error may occur on RCU side.
Common VSP:
System mode
51 HUS VM
VSP USP V/VM
Selects operation condition of TrueCopy.
ON: TrueCopy operates in the performance improvement logic.
(When a WRITE command is issued, FCP_CMD/FCP_DATA is continuously issued while XFER_RDY issued from RCU side is prevented.)
OFF (default): TrueCopy operates in the existing logic.
Note: Apply this option when TrueCopy write I/O is executed.
VSP, HUS VM:
1. When HMO 51 is set to ON, SSB log of link down is output on MCU (M-DKC) and RCU (R-DKC).
2. This HMO works only when the microprogram supporting this function is installed on both MCU (M-DKC) and RCU (R-DKC).
3. The HMO setting is only applied to Initiator-Port and RCU Target-Port. This function is only applicable when the 8UFC or 16UFC PCB is used on RCU/MCU.
4. When removing 8UFC or 16UFC PCB, the operation must be executed after setting HMO 51 to OFF.
5. If HMO 51 is set to ON while SOM 769 is ON, path creation may fail after automatic port switching.
6. Make sure to set HMO 51 from OFF to ON or from ON to OFF after the pair is suspended or when the load is low.
7. The RCU Target, which is connected with the MCU where this mode is set to ON, cannot be used for UR.
8. When HMO51 is set to ON using RAID600 as MCU and RAID700 as RCU, the micro-program of RAID600 must be 60-07-63-00/00 or higher (within 60-07-6x range) or 60-08-06-00/00 or higher.
9. Path attribute change (Initiator Port - Target Port, RCU-Target Port - Initiator Port) accompanied with Hyperswap is enabled after setting HMO51 to ON. If HMO51 is already set to ON on the both paths, HMO51 continues to be applied on the paths even after execution of Hyperswap.
10. In a storage system with maximum number of MPBs (8 MPBs) mounted, HMO051 may need to be used with HMO065. In this case, also see HMO 65.
USP V/VM:
1. When HMO 51 is set to ON, SSB log of link down is output on MCU (M-DKC).
2. This HMO works only when the microprogram supporting this function is installed on both MCU (M-DKC) and RCU (R-DKC).
3. The HMO setting is only applied to Initiator-Port. This function is only applicable when the 8US PCB is used on RCU/MCU.
4. When removing 8US PCB, the operation must be executed after setting the HMO 51 to OFF.
5. If HMO 51 is set to ON while SOM 769 is ON, path creation may fail after automatic port switching.
6. Make sure to set HMO 51 from OFF to ON or from ON to OFF after the pair is suspended or when the load is low.
7. The RCU Target, which is connected with the MCU where this mode is set to ON, cannot be used for UR.
8. When HMO51 is set to ON using RAID600 as MCU and RAID700 as RCU, the RAID600 microcode must be 60-07-63-00/00 or higher (within 60-07-6x range) or 60-08-06-00/00 or higher.
Common VSP:
System mode 51 9. Path attribute change (Initiator Port - Target Port,
RCU-Target Port - Initiator Port) accompanied with Hyperswap is enabled after setting HMO51 to ON. If HMO51 is already set to ON on the both paths, HMO51 continues to be applied on the paths even after execution of Hyperswap.
52 VSP Enables a function using HAM to transfer SCSI-2 reserve information. If using software for a cluster system that uses a SCSI-2 Reservation, set host mode option 52 on the host groups where the executing node and standby node reside.
ON: The function to transfer SCSI-2 reserve information is enabled.
OFF (default): The function to transfer SCSI-2 reserve information is not enabled.
Notes:
1. To use HAM to transfer SCSI-2 reserve information, the cluster middleware (alternate path) on host side must have been evaluated with the function.
2. Set this HMO to ON on both paths of P-VOL and S-VOL to use this function.
Common VSP: 70-03-01-00/00 or later
57 VSP USP V/VM
Converts the sense code/key that is returned when an S-VOL is accessed. Apply this HMO when the sense code/key response needs to be converted when an old data volume of an HAM pair is accessed.
ON: Sense code/key 05/2500 (LDEV blockage) converted from 0b/c0000 is returned when SSB=B8A0 is output.
OFF (default): Sense code/key 0b/c0000 is returned when SSB=B8A0 is output.
x0C, x2C,
x01, x21 ESXi 5 or later VSP: 70-02-03-00/00 or later USP V/VM: 60-08-01-00/00 or later
System mode
61 HUS VM
VSP
Increases Reservation Keys from 128 to 2,048.
ON: Up to 2,048 Reservation Keys can be allowed per port.
OFF (default): 128 Reservation Keys can be allowed per port.
Notes:
1. HMO 61 is applied when more than 128 Reservation Keys are required in the environment using the Persistent Reserve command.
2. When the option is set to ON, the performance of the Persistent Reserve command and read/write commands may degrade.
3. When the option is switched from ON to OFF, the expanded keys used so far become unavailable.
4. HMO61 setting can be switched from ON to OFF only when SOM864 is ON. To switch OFF from ON, make sure that there is no LU with PGR/Key registered in the target group.
5. If HMO61 is ON, the performance of Persistent Reserve command and that of I/O for Persistent Reserve LU may degrade.
6. If a host group where HMO61 is ON is deleted and a new host group is created, HMO61 goes OFF. However, if any LU with PGR/Key registered exists in the target group, host group deletion ends abnormally. (Current spec) 7. During micro-program version downgrade, if a
HMO61-caused error occurs, HMO61 needs to be set to OFF.
8. Switching HMO61 from ON to OFF while the 129th and later reservation keys exist may cause the following adverse effects, which may result in server down.
- Registered Reservation Keys become invalid.
- The above Reservation Keys suddenly become valid when the option is set to ON again.
9. The 129th and later Reservation Keys can be deleted by the following operations.
- Micro-program exchange from an unsupported version to a supported version.
- Forcible reserve cancellation.
10. HMO61 can be set to OFF in accordance with the following procedure.
Procedure 1: When neither “PGR” nor “KEY” is displayed on the LUN Status window
(1) Set SOM864 to ON (2) Set HMO61 to OFF (3) Set SOM864 to OFF
Procedure 2: When either “PGR” or “KEY” is displayed on the LUN Status window
(1) Release the “PGR” or “KEY” from the host.
(2) Confirm that neither “PGR” nor “KEY” is displayed on the LUN Status window
(3) Set SOM864 to ON.
(4) Set HMO61 to OFF (5) Set SOM864 to OFF.
Common VSP: 70-02-03-00/00 or later
System mode 65 VSP Selects TrueCopy operation mode when the Round Trip function
is enabled by setting HMO 051 to ON in the configuration of the maximum number of MPBs.
ON: TrueCopy is performed in enhanced performance improvement mode of Round Trip.
OFF (default): TrueCopy is performed in existing Round Trip mode.
Note:
1. The option is applied when response performance for an update I/O degrades while the Round Trip function is used in a configuration of the maximum number of MPBs.
2. When using the option, set HMO 51 to ON.
3. The option can work only when HMO 51 is ON. Refer to the document of HMO 51.
4. When the option is set to ON, SSB logs of link down are output on MCU (M-DKC) and RCU (R-DKC).
5. The option can work only when the micro-program supporting this function is installed on both MCU (M-DKC) and RCU (R-DKC).
6. The option setting is applied to Initiator-Port and RCU
6. The option setting is applied to Initiator-Port and RCU