SAN Drives mapped Via ISCSI disappeared from server

We have a HP MSA2012i SAN it was mapped to our backup server via ISCSI and appeared as 4 drives G,J,K and L.  Since Tuesday morning the drives have disappeared from the server.  I have had a look at the SAN and cant see any problems which are obvious with it.  In the backup server logs there were some iscsiPrt error logs see below

Connection to the target was lost. The initiator will attempt to retry the connection.
The initiator could not send an iSCSI PDU. Error status is given in the dump data.
Initiator failed to connect to the target. Target IP address and TCP Port number are given in dump data.

An help would be greatly appreciated?
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Hello ThereSystem AdministratorCommented:
Check if there is a network issue that the physical server can't access to the SAN.
Check if the physical can't reach the iSCSI drive because the SAN is down.
Check if there is the incorrect configuration on the NIC or switch so that the server can't access the iSCSI drive.
Check if the iSCSI has a configuration issue.

Antivirus might cause this too. Disable it and see if it helps.

Refer to this MS article about your issue:

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IMImobileAuthor Commented:
Thanks for your advice it helped
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