Other Device Discovery Or Iscsi Session Problems; Using Mixed Ipv4 And Ipv6 Configurations; Virtual Disk Not On Preferred Path (Vnop); Verifying Device Discovery - Dell PowerVault MD3260i Troubleshooting Manual

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Other Device Discovery or iSCSI Session Problems

Before starting the discovery process, verify that your host server can ping all iSCSI target ports.

When you initially set up your iSCSI storage array, the discovery process returns all accessible network

portals on the storage array. If both IPv4 and IPv6 are enabled and there are multiple storage arrays on

the same subnet, duplicate iSCSI sessions may be established. While both are supported, there is no

performance advantage to having multiple sessions established.

If an error message is displayed indicating that a virtual disk is not on a preferred path, verify that your

iSCSI session topology is configured in accordance with all information in this document. To establish a

virtual disk on a preferred path, the following minimal connectivity is required:

At least one active iSCSI session to each RAID controller module must be established.

Each iSCSI session must have disk ownership.

There must be a data path between the RAID controller owning the virtual disk and the host

server(s).

There are several ways to verify that you have successfully created an iSCSI session. First, check that

your host server appears in the Mappings tab of MD Storage Manager Array Management Window.

Second, right-click on a LUN and compare the information with that shown in the iSCSI initiator on the

host sever.

If necessary, define a new host in the Setup tab of the Array Management Window using the Manually

Define Hosts option.

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