VMFS Connectivity Degrading with Dell Powerflex

Products

• VMware vCenter Server

Issue/Introduction

Hosts continue to alert for "VMFS Volume Connectivity Degraded" in the vCenter.

Environment

ESXi (All versions)

Cause

Commands to the Dell Powerflex are timing out as seen in the following ESXi host vmkernel.log logging:

2025-06-04T10:58:17.023Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1463 :Mit: 0x45bb1f315a40. Retrying IO Type WRITE. Failed comb: 18d5801680c7. offsetInComb 9111024. SizeInLB 8. SDS_ID 1b0921600000000c. Comb Gen d42a. Head Gen d4aa
.
2025-06-04T10:58:17.023Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1477 :Mit: 0x45bb1f315a40. Vol ID 0x61f1ee09000002a7. Last fault Status IO_FAULT_NOT_PRI(12).Last error Status TIMEOUT(68) Retry count (1) chan (2)
2025-06-04T10:58:17.052Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1463 :Mit: 0x45bb1f2bfac0. Retrying IO Type WRITE. Failed comb: 18d500160077. offsetInComb 2045408. SizeInLB 168. SDS_ID 1b09215900000005. Comb Gen dc4a. Head Gen dd
af.
2025-06-04T10:58:17.052Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1477 :Mit: 0x45bb1f2bfac0. Vol ID 0x61f1ee08000002a6. Last fault Status IO_FAULT_NOT_PRI(12).Last error Status TIMEOUT(68) Retry count (1) chan (21)
2025-06-04T10:58:17.067Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1463 :Mit: 0x45baffc5e8c0. Retrying IO Type WRITE. Failed comb: 18dd801e820d. offsetInComb 3626952. SizeInLB 8. SDS_ID 1b09215300000001. Comb Gen f772. Head Gen f776
.
2025-06-04T10:58:17.067Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1477 :Mit: 0x45baffc5e8c0. Vol ID 0x61f1ee16000002b4. Last fault Status IO_FAULT_NOT_PRI(12).Last error Status TIMEOUT(68) Retry count (1) chan (3)
2025-06-04T10:58:18.137Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1463 :Mit: 0x45bb1f33e540. Retrying IO Type TEST_AND_SET. Failed comb: 18d680178015. offsetInComb 6046016. SizeInLB 1. SDS_ID 1b09215b00000007. Comb Gen e25d. Head G
en e2c9.
2025-06-04T10:58:18.137Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1477 :Mit: 0x45bb1f33e540. Vol ID 0x61f1ee0b000002a9. Last fault Status IO_FAULT_NOT_PRI(12).Last error Status TIMEOUT(68) Retry count (1) chan (1)
2025-06-04T10:58:18.137Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1463 :Mit: 0x45bb1624b880. Retrying IO Type TEST_AND_SET. Failed comb: 18df00200015. offsetInComb 14434624. SizeInLB 1. SDS_ID 1b09216600000012. Comb Gen 1161f. Head
 Gen 1166
2025-06-04T10:58:18.137Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1477 :Mit: 0x45bb1624b880. Vol ID 0x61f1ee19000002b7. Last fault Status IO_FAULT_NOT_PRI(12).Last error Status TIMEOUT(68) Retry count (1) chan (1)
2025-06-04T10:58:18.137Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1463 :Mit: 0x45baffdf02c0. Retrying IO Type TEST_AND_SET. Failed comb: 18d9001a0015. offsetInComb 6046016. SizeInLB 1. SDS_ID 1b09216400000010. Comb Gen 1227e. Head
Gen 122c2
2025-06-04T10:58:18.137Z cpu2:2098602)WARNING: PowerFlex mapVolIO_Do_CK:1477 :Mit: 0x45baffdf02c0. Vol ID 0x61f1ee0f000002ad. Last fault Status IO_FAULT_NOT_PRI(12).Last error Status BUSY(28) Retry count (1) chan (1)
2025-06-04T10:58:25.024Z cpu71:2099307)VMotionServer: 386: Error reading from pending connection: Connection closed by remote host, possibly due to timeout
2025-06-04T10:58:25.124Z cpu71:2099307)MigrateNet: vm 2099307: 3232: Accepted connection from <##.##.##.##>
2025-06-04T10:58:25.124Z cpu71:2099307)MigrateNet: vm 2099307: 3320: dataSocket 0x431c095a7b00 receive buffer size is 563040

Resolution

This issue was resolved by Dell Support, please open a case with Dell to review and refer to the KB article.