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iSCSI Issues

Can't remove some targets form iSCSI
iSCSI Authorization Failure Cases
iSCSI and SAN Issue
iSCSI and Dynamic Disk issue
iSCSI firewall exception has not been enabled
iSCSI issue after upgrading EqualLogic SAN Firmware
iSCSI Target doesn't show any SAN Volume
Lost file sharing on iSCSI devices when restarting Windows
Some of the iscsi share lost after server 2003 restarted
Lost file shares on iSCSI devices after rebooting the server
Problem to set Multi-path on Windows 2008
System running slow because of iSCSI
Using Vista as initiator to copy files to iSCSI target fail
Windows 2008 losses iSCSI drive after restart

iSCSI and SAN Issue

Situation: The client configured 3 NICs to access EqualLogic SAN, However, the Networking under Windows Task Manager shows only one NIC has traffics. If you open iSCSI Initiator, you should see all connections under Dell EquallLogic MPIO. If not, we may have SAN connection issues.



Case 1: Need to install EqulLogic Integration (MPIO) Tools.

Case 2: If you don't install MPIO Tool, you may configure MPIO  Manually. To configure MPIO manually, open iSCSI and select Discovery tab. Click Discovery Portal and enter group IP address. Select Advanced. In the General tab, select Microsoft iSCSI Initiator under Local adapter. In Initiator IP, select the SAN IP in the server.  Click OK when finishing it.

Case 3: One of SAN NIC has a connectivity issue.

Case 4: The Cisco switch port didn't configure right. Missing VLAN configuration

Case 5: .The client uses VLAN 800 for SAN. He needs to add 800 to the Properties of the NIC configuration.
Case 6: Configure the NIC TCP/IP settings.. EqualLogic recommends to disable all services except IPv4 as shown below.

SAN TCP/IP settigns

Case 7: Re-configure NIC, for example, enable Flow Control; disable both IPv4 and 6 Large send offload; disable both IPv4 and 6 TCP Connection offload.

Case 8: Q: We have 3 SQL servers running on windows 2003 and windows 2008. We are planning to use SQL backup to back up all SQL servers' data to a volume in EqualLogic SAN. Then use Backup Exec to  back up all files in the SAN.

The problem is the Backup server can't see the files in the SQL servers created. For example, REPEWIN server backs up the SQL data to a folder called REPEWIN under the SAN volume called SQLinSAN
.



The PEONLINE server backs up it SQL data to a folder called PEONLINE under the same SAN volume.


The Backup server doesn't see these two folders: REPEWIN and PEONLINE.  The two SQL servers don't see each other's folder. Why?


A:

What you see is expected. In order to present a LUN to more than one server you will need to use something like Windows Cluster Server. Consider this, if you could concurrently access the same single LUN, how do you protect the data consistency? Two servers could be writing to the same file at the same time which would cause the data corruption. In order to share a LUN you need some lock management here to ensure the data is locked when being concurrently accessed and written to.

What you need to do is to backup the SQL data to the LUN, un-present the LUN from the SQL server, present it to the BackupExec server, backup the data and then un-present and present back. You need to do it in the SAN configuration tool. You could contact your storage vendor and they will share you with the information you

iSCSI Target doesn't show any SAN Volume

Situation: After the client added SAN group IP address to the iSCSI Discovery and refresh, the Target doesn't show any SAN Volume.

Troubleshooting: 1. Make sure the computer running iSCSI has right to access the SAN.

 

 

 

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