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Dell Unity: Several drives in expansion enclosures showing as faulted (User Correctable)

Summary: This article explains the symptoms and resolution of several drives appearing as faulted in a newly installed array (this could also happen if there is cross cabling after Unity has been installed) ...

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Symptoms

  • Unisphere GUI shows alerts for several DAE drives:
Unisphere GUI shows alerts for several DAE drives
 
  • In this instant, due to looped backend connectivity, there were only three expansion enclosures connected, but it showed six enclosures.
  • Inability to create pools with these drives, and if array was already operational, the pools would be offline.
 

Cause

Improper backend cabling.

Problematic Connection:
** As seen below, SAS port 1 on the DPE SPA is connected to LCC A Port "B" not Port "A" and DPE SPB SAS Port 1 is connected to the last DAE's LCC B Port "B". This makes the last DAE connected 1_0 and 0_2 at the same time. Which created a loop?
Problematic Connection
 

Resolution

Rectify the connectivity to be as follows:
 
DAE 0_0 connectivity to DPE:
DPE SP A SAS port 0 DAE 0_0 LCC A port A
DPE SP B SAS port 0 DAE 0_0 LCC B port A
DAE 1_0 connectivity to DPE:
DPE SP A SAS port 1 DAE 1_0 LCC A port A
DPE SP B SAS port 1 DAE 1_0 LCC B port A
DAE 0_1 connectivity:
DAE 0_0 LCC A port B DAE 0_1 LCC A Port A
DAE 0_0 LCC B Port B DAE 0_1 LCC B Port A

Rectify the connectivity

DPE - DAE 1_0

Rectify the connectivity

DPE - DAE 0_0
** Remember, the first enclosure connected to SAS port 0 on the DPE is 0_0 if it is a UnityXT Family and would be 0_1 if it is Unity xxx/xxxF/x50 Family.
Rectify the connectivity
DAE - DAE (0_1) or (1_1)
Rectify the connectivity

Reference:
https://www.dell.com/en-ie/dt/documentation/unity-family/unity-p-unity-platforms-hardware-information-specs/05-generic-br-hwo-dae-cabling.htm
 
 
 

Affected Products

Dell EMC Unity, Dell Unity 300, Dell EMC Unity 300F, Dell EMC Unity 350F, Dell EMC Unity 400, Dell EMC Unity 400F, Dell EMC Unity 450F, Dell EMC Unity 500, Dell EMC Unity 500F, Dell EMC Unity 550F

Products

Dell EMC Unity XT 380, Dell EMC Unity XT 380F, Dell EMC Unity XT 480, Dell EMC Unity XT 480F, Dell EMC Unity 600, Dell EMC Unity 600F, Dell EMC Unity 650F, Dell EMC Unity XT 680, Dell EMC Unity XT 680F, Dell EMC Unity XT 880, Dell EMC Unity XT 880F , Dell EMC Unity Family |Dell EMC Unity All Flash, Dell EMC Unity Family, Dell EMC Unity Hybrid ...
Article Properties
Article Number: 000199915
Article Type: Solution
Last Modified: 30 May 2023
Version:  7
Find answers to your questions from other Dell users
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Article Properties
Article Number: 000199915
Article Type: Solution
Last Modified: 30 May 2023
Version:  7
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.