NVMe/TCP configuration

Provisioning Guide for VSP One Block

Version
10.2.x
Audience
anonymous
Part Number
MK-23VSP1B012-00

Provisioning operations on the NVMe/TCP (NVM subsystem, NVM subsystem port, namespace, host NQN settings, and so on) cannot be implemented from VSP One Block Administrator as shown in the following table. Use CCI. For details about provisioning operations by using CCI, see the Command Control Interface Command Reference.

Operation Availability
VSP One Block Administrator Command Control Interface
Setting a host mode and a host mode option No Yes
Setting port parameters (IP address, MTU, Window Size, and others) Yes Yes
Viewing the operation mode setting for a port Yes Yes
Viewing a namespace ID assigned to LDEV No No
Viewing the attribute that indicates whether a volume is used as namespace Yes* Yes
* To check whether a volume is used as a namespace, check the volume type in the volume list or Volume Details window in VSP One Block Administrator. If the volume is used as a namespace, “Namespace” is displayed for the volume type.

Follow these additional guidelines:

  • Before performing the following operation, verify that the host is not running the I/O operation and that no volumes are mounted. Performing the operation while an I/O operation is running or a volume is mounted disconnects the storage system and the host:
    • Enabling the namespace security
  • Before performing the following operations, verify that the host is not running the I/O operations and that no volumes are mounted:
    • Removing a namespace
    • Deleting an access path (host-namespace path) between a host NQN and a namespace
    • Removing an NVM subsystem port
    • Changing the NVMe/TCP port parameters
    • Changing a host mode
  • Set the host queue depth so that the number of command multiple executions is below the following threshold for each channel port. A value higher than the threshold might cause a significant performance degradation on the host and then a failure such as job abend.
    • When using a command that is 256 KB or less: The number of command multiple executions must be 2,048 or less per channel port.
    • When using a command that exceeds 256 KB: The command is divided into units of 256 KB when it is transferred. Consider the number of divisions and make sure that the total number of command multiple executions is 2,048 or less.