SAS port PHY disabled even after cable and IOM replacement
Applies to
- FAS systems
- AFF systems
Issue
- DegradedOnlinePort alert is reported for a SAS port:
[node-name: nchmd: hm.alert.raised:alert]: Alert Id = DegradedOnlinePort_Alert , Alerting Resource = 0c raised by monitor node-connect
Cluster::> system health alert show
Node: Node-01
Alert ID: DegradedOnlinePort_Alert
Resource: Port 0c
Severity: Major
Indication Time: Mon Dec 15 12:11:32 2025
Suppress: false
Acknowledge: false
Probable Cause: SAS port 0c on controller Node-01 has 3 disabled
PHYs.
Possible Effect: Inactive PHYs might cause degraded link performance.
Corrective Actions: 1. Verify that SAS port 0c has disabled PHYs by using the "storage port show -node node-01 -port 0c" command.
2. If the disk shelves connected to port 0c have multiple path to the node, reset port 0c by using the (privilege: advanced) "storage port reset -node node-01 -port 0c" command.
3. Verify that the physical cable connection is secure and operational. If the disk shelves are multipathed, reseat the cable.
4. If the connected disk shelf is multipathed, replace
the SAS cable.
Cluster::> system health subsystem show
Subsystem Health
----------------- ------------------
SAS-connect degraded
Environment ok
Memory ok
Service-Processor ok- From
sysconfig -alogs, it is found that one of the PHYs is disabled:
slot 0: SAS Host Adapter 0d (Broadcom SAS3616W rev. 2, SAS, <UP>)
Firmware rev: 12.00.00.00
NVDATA rev: 12.03.01.02
Base WWN: 5:XXXXX:XXXXX:4e
Temperature: Not Available
Phy State: [0] Enabled, 12.0 Gb/s
[1] Enabled, 12.0 Gb/s
[2] Enabled, 12.0 Gb/s
[3] Disabled
- The PHY remains disabled, even after replacing the cable and IOM connected to it.