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iSCSI connections are lost on some hosts after E-Series controller replacement

  1. Last updated
    Jan 27, 2025
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Category:
e-series-systems
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Last Updated:
1/27/2025, 4:13:16 AM

Applies to

  • E-Series
  • SANtricity OS
  • Linux DM-MP (Device Mapper Multipath)
  • Controller replacement was performed

Issue

  • Some hosts loose iSCSI connection(s) after replacement of E-Series controller
  • Recovery Guru and MAJOR-EVENT-LOG (MEL) reports the following errors:
    • Loss of host-side connection redundancy detected
    • Volume not on preferred path due to AVT/RDAC failover
    • ALB_HOST_REDUNDANCY_LOST
    • NON_PREFERRED_PATH
  • Redistribute volumes temporary resolves these errors but they are detected again after several minutes
  • No configuration changes performed both on controller and host other than the controller replacement
  • STATE-CAPTURE-DATA > spmShow indicates that the replaced controller does not have iSCSI connections from some hosts that the partner controller has

Example of after the replacement of controller A:

Executing spmShow(0,0,0,0,0,0,0,0,0,0) on controller A:

---I-T-Nexus (PORT) Objects (ITN)---
ITNID InitiatorPort                  TargetPort                     Online
----- ------------------------------ ------------------------------ ------
x0005 Host_0000000000000003          iSCSI_TargetPortPR_Ah_ch7      on     <IQN>:<HOST1>
x0006 Host_0000000000000004          iSCSI_TargetPortPR_Ah_ch8      on     <IQN>:<HOST1>


Executing spmShow(0,0,0,0,0,0,0,0,0,0) on controller B:

---I-T-Nexus (PORT) Objects (ITN)---
ITNID InitiatorPort                  TargetPort                     Online
----- ------------------------------ ------------------------------ ------
x0005 Host_0000000100000004          iSCSI_TargetPortPR_Bh_ch8      off    <IQN>:<HOST1>
x0006 Host_0000000100000002          iSCSI_TargetPortPR_Bh_ch8      on     <IQN>:<HOST1>
x0007 Host_0000000100000002          iSCSI_TargetPortPR_Bh_ch8      on     <IQN>:<HOST1>
x0008 Host_0000000100000020          iSCSI_TargetPortPR_Bh_ch8      off    <IQN>:<HOST2>
x0009 Host_0000000100000001          iSCSI_TargetPortPR_Bh_ch7      on     <IQN>:<HOST2>
x000a Host_000000010000001f          iSCSI_TargetPortPR_Bh_ch7      off    <IQN>:<HOST1>
x000b Host_0000000100000002          iSCSI_TargetPortPR_Bh_ch8      off    <IQN>:<HOST2>
x000c Host_0000000100000001          iSCSI_TargetPortPR_Bh_ch7      on     <IQN>:<HOST2>
x000d Host_0000000100000002          iSCSI_TargetPortPR_Bh_ch8      on     <IQN>:<HOST3>
x000e Host_0000000100000002          iSCSI_TargetPortPR_Bh_ch8      on     <IQN>:<HOST3>

 

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