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Permanent Device Loss (PDL) And All-Paths-Down (APD) In vSphere 5.x and 6.x

Permanent Device Loss (PDL) in vSphere 5.x and 6.x

  • A data store might appear as unavailable in the Storage view
  • A storage adapter specifies the Operational State of the device as “Lost Communication”.
  • All the pathways to the device are marked “Dead”.
  • In the /var/log/vmkernel.log file, you see entries same as:cpu2:853571)VMW_SATP_ALUA: satp_alua_issueCommandOnPath:661: Path “vmhba3:C0:T0:L0” (PERM LOSS) command 0xa3 failed with status Device is permanently unavailable. H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x25 0x0.
    cpu2:853571)VMW_SATP_ALUA: satp_alua_issueCommandOnPath:661: Path “vmhba4:C0:T0:L0” (PERM LOSS) command 0xa3 failed with status Device is permanently unavailable. H:0x0 D:0x2 P:0x0 Valid sense data: 0x5 0x25 0x0.
    cpu2:853571)WARNING: vmw_psp_rr: psp_rrSelectPathToActivate:972:Could not select path for device “naa.60a98000572d54724a34642d71325763”.
    cpu2:853571)WARNING: ScsiDevice: 1223: Device
    :naa.60a98000572d54724a34642d71325763 has been removed or is permanently inaccessible.
    cpu3:2132)ScsiDeviceIO: 2288: Cmd(0x4124403c1fc0) 0x9e, CmdSN 0xec86 to dev “naa.60a98000572d54724a34642d71325763” failed H:0x8 D:0x0 P:0x0
    cpu3:2132)WARNING: NMP: nmp_DeviceStartLoop:721:NMP Device “naa.60a98000572d54724a34642d71325763” is blocked. Not starting I/O from device.
    cpu2:2127)ScsiDeviceIO: 2316: Cmd(0x4124403c1fc0) 0x25, CmdSN 0xecab to dev “naa.60a98000572d54724a34642d71325763” failed H:0x1 D:0x0 P:0x0 Possible sense data: 0x5 0x25 0x0.
    cpu2:854568)WARNING: ScsiDeviceIO: 7330: READ CAPACITY on device “naa.60a98000572d54724a34642d71325763” from Plugin “NMP” failed. I/O error
    cpu2:854568)ScsiDevice: 1238: Permanently inaccessible device :naa.60a98000572d54724a34642d71325763 has no more open connections. It is now safe to unmount datastores (if any) and delete the device.
    cpu3:854577)WARNING: NMP: nmpDeviceAttemptFailover:562:Retry world restore device “naa.60a98000572d54724a34642d71325763” – no more commands to retry

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All-Paths-Down (APD) in vSphere 5.x and 6.x

    • A data store is presented as inaccessible in the “Storage view”.
    • A storage adapter shows the” Operational State” of the device such as Dead or Error
    • All paths to the device are marked Dead vSphere 5.x and 6.x
    • You are not able to connect to  ESXi directly, host using the vSphere 5.x and 6.x Client
    • The ESXi host shows as Disconnected in vCenter Server
    • In the /var/log/vmkernel.log file, you see entries comparable to:cpu1:2049)WARNING: NMP: nmp_IssueCommandToDevice:2954:I/O could not be issued to device “naa.60a98000572d54724a34642d71325763” due to Not found
      cpu1:2049)WARNING: NMP: nmp_DeviceRetryCommand:133:Device “naa.60a98000572d54724a34642d71325763”: awaiting fast path state update for failover with I/O blocked. No prior reservation exists on the device.
      cpu1:2049)WARNING: NMP: nmp_DeviceStartLoop:721:NMP Device “naa.60a98000572d54724a34642d71325763” is blocked. Not starting I/O from device.
      cpu1:2642)WARNING: NMP: nmpDeviceAttemptFailover:599:Retry world failover device “naa.60a98000572d54724a34642d71325763” – issuing command 0x4124007ba7c0
      cpu1:2642)WARNING: NMP: nmpDeviceAttemptFailover:658:Retry world failover device “naa.60a98000572d54724a34642d71325763” – failed to issue command due to Not found (APD), try again…
      cpu1:2642)WARNING: NMP: nmpDeviceAttemptFailover:708:Logical device “naa.60a98000572d54724a34642d71325763”: awaiting fast path state update…
      cpu0:2642)WARNING: NMP: nmpDeviceAttemptFailover:599:Retry world failover device “naa.60a98000572d54724a34642d71325763” – issuing command 0x4124007ba7c0
      cpu0:2642)WARNING: NMP: nmpDeviceAttemptFailover:658:Retry world failover device “naa.60a98000572d54724a34642d71325763” – failed to issue command due to Not found (APD), try again…
      cpu0:2642)WARNING: NMP: nmpDeviceAttemptFailover:708:Logical device “naa.60a98000572d54724a34642d71325763”: awaiting fast path state update…

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  • You may also see that the device is no longer listed:cpu17:10107)WARNING: Vol3: 1717: Failed to refresh FS 4beb089b-68037158-2ecc-00215eda1af6 descriptor: Device is permanently unavailable
    cpu17:10107)ScsiDeviceIO: 2316: Cmd(0x412442939bc0) 0x28, CmdSN 0x367bb6 from world 10107 to dev “eui.00173800084f0005” failed H:0x1 D:0x0 P:0x0 Possible sense data: 0x0 0x0 0x0.
    cpu17:10107)Vol3: 1767: Error refreshing PB resMeta: Device is permanently unavailable.

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