Milliondollarloading907

Instructions

The following procedures describe how to identify and correct the problem with SCSI ID mappings in XenServer.

Identify the SCSI ID mapping which has issue:

1. In XenCenter, iSCSI SR General Tab indicates that the Storage Repository is unplugged:

2. Repair fails with “No such device” error:

3. Identify what is the current SCSI ID on the LUN containing your Storage Repository:
   # xe sr-probe type=lvmoiscsi device-config:target=<Target IP> device-
   config:targetIQN=<Target IQN>

   Example:
   # xe sr-probe type=lvmoiscsi device-config:target=10.12.45.10 device-config:targetIQN=iqn.1992-08.com.netapp:sn.135027806
   Error code: SR_BACKEND_FAILURE_107
   Error parameters: , The SCSIid parameter is missing or incorrect, <?xml version='1.0' ?>
   <iscsi-target>
   <LUN>
   <vendor>
   NETAPP
   </vendor>
   <serial>
   P3LfCZIcoVML
   </serial>
   <LUNid>
   150
   </LUNid>
   <size>
   23622320128
   </size>
   <SCSIid>
   360a9800050334c66435a49636f564d4c
   </SCSIid>
   </LUN>
   </iscsi-target>

4. Identify what SCSI ID the XenServer expects to be on the LUN containing your Storage Repository by running the following commands:
   # xe sr-list type=lvmoiscsi - Identify UUID of the SR that is unplugged.
   # xe pbd-list sr-uuid=<SR UUID> - Identify expected SCSI ID of the LUN containing SR that is unplugged.

   Example:
   # xe sr-list type=lvmoiscsi
   uuid ( RO) : f6a7d8be-cd21-d9b2-1864-9c67d7ed1724
   name-label ( RW): iSCSI virtual disk storage
   name-description ( RW): iSCSI SR [10.12.45.10 (iqn.1992-08.com.netapp:sn.135027806)]
   host ( RO): xenserver-dellAMDR131
   type ( RO): lvmoiscsi
   content-type ( RO):

   # xe pbd-list sr-uuid=f6a7d8be-cd21-d9b2-1864-9c67d7ed1724
   uuid ( RO) : 9cd47f3e-944d-0ea2-522c-5c7e399543ab
   host-uuid ( RO): ac3e1d25-c12e-4588-bc35-857ad1fa7e43
   sr-uuid ( RO): f6a7d8be-cd21-d9b2-1864-9c67d7ed1724
   device-config (MRO): port: 3260; target: 10.12.45.10; SCSIid: 360a9800050334c66435a49636f545143; targetIQN: iqn.1992-08.com.netapp:sn.135027806
   currently-attached ( RO): false

   Note: This SCSI ID should match the entry under the XenCenter iSCSI SR General Tab.
   SCSI ID collected from steps 3 and 4 must match. If they do not your LUN SCSI ID has been changed.

Correct SCSI ID mappings

To correct the issue you must recreate a PBD with the entry to reflect the right SCSI ID.

1. Destroy the existing PBD by running the following commands:
   # xe pbd-unplug uuid=<PBD UUID> - PBD of the iSCSI Storage Repository with mismatched SCSI ID collected from the output of the pbd-list command during your investigation.
   # xe pbd-destroy uuid=<PBD UUID> - PBD of the iSCSI SR with mismatched SCSI ID collected from the output of the pbd-list command during your investigation.

   Example:
   # xe pbd-unplug uuid=9cd47f3e-944d-0ea2-522c-5c7e399543ab
   # xe pbd-destroy uuid=9cd47f3e-944d-0ea2-522c-5c7e399543ab

2. Create new PBD and activate Storage Repository by running the following commands:
   # xe pbd-create sr-uuid=<SR UUID> host-uuid=<Host UUID> device- config:target=<Target IP> device-config:targetIQN=<Target IQN> device-config:SCSIid=<SCSI ID> - SCSI ID collected from the output of the pbd-list command during your investigation.

   # xe pbd-plug uuid=<PBD UUID> > - Activate SR by plugging in newly created PBD.

   Example:
   # xe pbd-create sr-uuid=f6a7d8be-cd21-d9b2-1864-9c67d7ed1724 host -uuid=ac3e1d25-c12e-4588-bc35-857ad1fa7e43 device-config:target=10.12.45.10 device-config:targetIQN=iqn.1992 -08.com.netapp:sn.135027806 device-config:SCSIid=360a9800050334c66435a49636f564d4c
   2cb5ead5-0184-e5ec-e25d-2897ce402a81 <- Will return UUID of the created PBD.
   # xe pbd-plug uuid=2cb5ead5-0184-e5ec-e25d-2897ce402a81

3. Confirm that the Storage Repository is active in XenCenter iSCSI SR General Tab.
   Note: XenCenter have to be restarted.

Additional Resources

Additional background and/or reference information can be obtained from the XenServer Administrators guide.

Welcome to Carl Stalhood’s website. Carl Stalhood is a Citrix Technology Professional (CTP), a VMware EUC vExpert, a VMware Implementation Expert 7 Desktop & Mobility (VCIX7-DTM) and works as a Principal Consultant for Sirius Computer Solutions in Kansas City. More info at About Carl Stalhood.

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