Only 1 path active on XS which is part of the pool
While creating new SR on XS 6.0.2 on EMC VNX 5300 will show one host with 1 active path rest all have all the active path . When multipath -ll is run it will also show one path . This shows that all the path is not having access to the lun .
From the host which has an issue logoff all the active path
iscsiadm -m node -U all and then logback in iscsiadm -m node -L all.
Restart the multipathd service /etc/init.d/multipathd restart. This will bring all the path active on the host.
How to map iSCSI interface of XenServer and 5.6, 6.0.2 VNX 5300
First define storage interface on XenServer and for that choose configure under “Management Interface ” and then select “New Interface” . Now specify the name and then choose the NIC which will be configure for storage traffic. Supply IP address. This needs to be repeated for all the interface which is connected to the storage.
Once this is done then perform discovery of the nic for the logging into EMC. This can be perform via CLI as well as via XenCenter.
My experience is to use XenCenter
To perform via XenCenter select new storage and choose “Software iSCSI”. Choose “Name” and then under location provide information as follows :
Target host: This will be IP address of target Storage Processor or controller . Specify all the IP address with ,
Target IQN: Here you will find IQN of the target storage processor . If it has 4 ports then you will see 4 IQN. We need to choose the one which is highlighted (*)
This will log all the targets on the EMC VNX box to mapped .
From the command line following needs to be run from the host in order to login.
Once all the message says successfully login , open EMC Unishpere and select “Connectivity status ” on left hand side under “Hosts “. This will popup Host initiators window. You will find one name with just IQN as shown below. This is the new targets which has logged in . Select “Edit ” from bottom and then provide information about “host name” “IP address” . IP address is of XenServer management IP . Make sure you choose initiator type as “clarion open ” and Fail Over mode as “ALUA 4”. ALUA is the latest fail over mode as per EMC.
iscsiadm -m discovery -t st -p 10.0.6.20
iscsiadm -m node -L all