chhost

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Use the chhost command to change the name or type of a host object. This command does not affect any existing host mappings.

Syntax

Read syntax diagramSkip visual syntax diagram chhost -typehpuxtpgsgenericopenvmsadminlunhide_secondary-namenew_name_arg-iscsiusernameusername_for_authentication-chapsecretchap_secret-nochapsecret-portsetportset_id | portset_namehost_namehost_id
Note: Mapping a new portset to a host object can cause host application outage unless the newly mapped portset contains at least one port that is overlapping with the old portset. If volume protection is turned on, the administrator cannot change to a portset that doesn't have at least one overlapping port. To override that restriction and enforce a change, the global admin must run the chsystem -vdiskprotectionenabled no command to turn off volume protection for the system. Also, if a host is offline, the volume protection check is bypassed and chhost will allow a portset with non-overlapping ports to be used.

Parameters

-type hpux | tpgs | generic | openvms | adminlun | hide_secondary
(Optional) Specifies the type of host. The following values are the available host types:
  • generic indicates the default.
  • tpgs indicates when target port information changes (extra unit attentions are given to the host).
  • openvms indicates OpenVMS.
  • adminlun indicates virtual volumes, which are enabled on the host.
  • hpux indicates HP-UX firmware.
  • hide_secondary indicates that all remote copy relationship secondary volumes are unavailable to the host.

The host type for NVMe hosts cannot be changed. For more information about hosts that require the type parameter, see the FlashSystem 7300 host attachment documentation.

-name new_name_arg
(Optional) Specifies the new name that you want to assign to the host object.
-iscsiusername username_for_authentication
(Optional) Specifies the user name for a host object for one-way authentication for Internet Small Computer System Interface (iSCSI) host attachment login. If this parameter is specified, the value is taken as the "username" for one-way authentication to log in to the iSCSI host attachment. If you do not specify the iscsiusername parameter, the IQN of the host object is used as the user name by default. If no iscsiusername parameter is provided and multiple IQNs exist in the same host object, the user name of each IQN is the IQN itself. If the iscsiusername parameter is provided for a multiple IQN host, then log in to all hosts by using the provided IQN. If you use the iscsiusername parameter, you must also specify the chapsecret parameter.
-chapsecret chap_secret
(Optional) Sets the Challenge Handshake Authentication Protocol (CHAP) secret that is used to authenticate the host for iSCSI I/O. This secret is shared between the host and the cluster. The CHAP secret for each host can be listed by using the lsiscsiauth command.
-nochapsecret
(Optional) Clears any previously set CHAP secret for this host. The nochapsecret parameter cannot be specified whether chapsecret is specified.
-site site_name | site_id
(Optional) Specifies the numeric site value or site name of the host. The site name must be an alphanumeric value. The site ID must be 1 or 2. The site that is assigned to a host can be changed with any topology (hyperswap or standard).
Note: If the host is mapped to a volume that is in an active-active relationship (HyperSwap®), you cannot specify -nosite.
-nosite
(Optional) Resets the site value.
-statuspolicy redundant | complete
(Optional) Specifies if complete or redundant policy is used for online status calculations.
  • Complete connectivity is where online host status indicates complete connectivity, with every host port that is logged in to every node through which that host can access volumes, and degraded host status indicates one or more of these nodes does not have a login.
  • Redundant connectivity calculation is where online host status indicates redundant connectivity, where enough host ports are logged in to enough nodes such that the removal of a single node or a single host port allows that host to access all of its volumes. In addition, there must be the same total login count from the host to each node within an I/O group. Degraded host status indicates non-redundant connectivity, in which a single point of failure prevents a host from accessing at least some of its volumes, or there is no single point of failure but the total login count from the host to each node within an I/O group is not the same.

The default value is redundant.

-statussite all | local
(Optional) Specifies whether all sites or only the local host site connectivity is used to determine online status. local is only applicable in a dual site topology for a host with a valid site. The default value is all.
-ownershipgroup owner_id | owner_name
(Optional) The name or ID of the ownership group to which the object is being added.
-noownershipgroup
(Optional) If specified, the object is removed from the ownership group to which it belongs.
-portset
(Optional) The name or ID of the portset to associate with the host object.
Note: Admin can run device discovery from the host after running this command as changing portset of a host changes I/O paths for the host. Running discovery allows host to discover the devices from valid I/O paths.
host_name | host_id
(Required) Specifies the host object to modify, either by ID or by current name.

Description

This command can change the name of the specified host to a new name, or it can change the type of host. This command does not affect any of the current host mappings.

Note: When all I/O groups are removed from an iSCSI host, the lsiscsiauth command does not display the authentication entry for that host. Use the addhostiogrp command to map the iSCSI host to at least one I/O group, and then use the addhostport command to add the iSCSI port into it. You must also add authentication for that host by using the chhost command with either the chapsecret or nochapsecret parameter.
  • Policy to check portset port_type must match the type of the host (FC, NVMe or iSCSI) created.
Note: The 100 GB ports are mainly used for NVMe over RDMA connections to host attachments. Any attempt to map an iSCSI host using chhost to a 100 GB portset will fail. This iSCSI mapping using chhost cannot be completed through any plugins or GUI. This fails because 100 GB portset will not match the performance expectation for iSCSI host attach connectivity. However, user can use -force flag CLI command to map an iSCSI host to a 100 GB port for less demanding application or boot from SAN applications.
Note: To change the portset by using the chhost command user has to check portset port_type and it must match the type of the host (FC, NVMe, or iSCSI) created.

An invocation example

chhost -portset myportset myhost

The following output is displayed: 

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An invocation example

chhost -name testhostlode  hostone

The following output is displayed: 

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An invocation example

chhost -type openvms 0

The following output is displayed: 

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