- Data ONTAP
- SAN Protocols (iSCSI & FC)
- VMware vSphere 5.5U2 and up
- ESXi hosts experience repeated LUN resets. For example, from the vmkernel.log, events similar to the following are seen:
2022-04-04T12:33:17.949Z: [scsiCorrelator] 5693120512199us: [vob.scsi.scsipath.por] Power-on Reset occurred on naa.600a0980xxxxxxxxxxxxxxxxxxxxxxx
- In addition to LUN resets, there is also evidence of datastore heartbeat timeouts:
2022-04-04T08:03:16.087Z: [vmfsCorrelator] 5677371531974us: [esx.problem.vmfs.heartbeat.timedout] xxxxxxxx-xxxxxxxx-xxx-xxxxxxxxxxx lun_vmfs_1
"Loss of access to volume (LUN_xyz) due to connectivity problems. A recovery attempt is underway and the result will be transmitted shortly."
SCSI 2 reservations
2022-04-04T08:03:31.105Z cpu1:2097761)NMP: nmp_PathDetermineFailure:3560: SCSI cmd RESERVE failed on path vmhba64:C2:T1:L3, reservation state on device naa.600a0980383136446f3f4e4c5a484355 is unknown.
ATS Compare and Write
2022-04-04T09:35:44.604Z cpu16:2098262)NMP: nmp_ThrottleLogForDevice:3872: Cmd 0x89 (0x45baf02353c0, 2099582) to dev "naa.600a0980xxxxxxxxxxxxxxxxxxxxxxx" on path "vmhba64:C3:T1:L2" Failed: H:0x0 D:0x2 P:0x0 Valid sense data: 0xe 0x1d 0x0. Act:NONE