4.3 Probing Policy and Querying Logical Flow Status
The following diagram demonstrated the steps taken to probe current policy configuration for an open and to query logical flow status.

Figure 2: Probing policy and querying logical flow status
The client sends an SMB2 IOCTL Request with a STORAGE_QOS_CONTROL_REQUEST buffer to query the status of an existing logical flow and probe its policy configuration:
01 01 00 00 1C 00 00 00 E4 32 3A B1 AD E2 B2 5D A4 F8 5C D3 BE 9D 69 6E 4E F2 B4 04 E9 B3 94 45 AD AA E3 27 52 8D E5 4B C6 4D 9E 1B C0 F8 9F 41 87 85 80 65 BC FF 72 84 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 8F 01 00 00 00 00 00 00 8F 01 00 00 00 00 00 00 E0 3E 47 02 00 00 00 00 E0 3E 47 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ProtocolVersion: 0x0101 Reserved: 0x0000 Options: 0x0000001C (STORAGE_QOS_CONTROL_FLAG_PROBE_POLICY | STORAGE_QOS_CONTROL_FLAG_GET_STATUS | STORAGE_QOS_CONTROL_FLAG_UPATE_COUNTERS) LogicalFlowID: b13a32e4-e2ad-5db2-a4f8-5cd3be9d696e PolicyID: 04b4f24e-b3e9-4594-adaa-e327528de54b InitiatorID: 1b9e4dc6-f8c0-419f-8785-8065bcff7284 Limit: 0x0000000000000000 Reservation: 0x0000000000000000 InitiatorNameOffset: 0 (0x0000) InitiatorNameLength: 0 (0x0000) InitiatorNodeNameOffset: 0 (0x0000) InitiatorNodeNameLength: 0 (0x0000) IoCountIncrement: 399 (0x000000000000018F) NormalizedIoCountIncrement: 399 (0x000000000000018F) LatencyIncrement: 38223584 (0x0000000002473EE0) LowerLatencyIncrement: 38223584 (0x0000000002473EE0) BandwidthLimit: 0x0000000000000000 KilobyteCountIncrement: 0x0000000000000000
The server sends an SMB2 IOCTL Response with STATUS_SUCCESS and a STORAGE_QOS_CONTROL_RESPONSE output buffer:
01 01 00 00 00 00 00 00 E4 32 3A B1 AD E2 B2 5D A4 F8 5C D3 BE 9D 69 6E 4E F2 B4 04 E9 B3 94 45 AD AA E3 27 52 8D E5 4B C6 4D 9E 1B C0 F8 9F 41 87 85 80 65 BC FF 72 84 8D 0F 00 00 00 00 00 00 64 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 C8 00 00 00 00 00 00 00 00 20 00 00 00 00 00 00 ProtocolVersion: 0x0101 Reserved: 0x0000 Options: 0x00000000 LogicalFlowID: b13a32e4-e2ad-5db2-a4f8-5cd3be9d696e PolicyID: 04b4f24e-b3e9-4594-adaa-e327528de54b InitiatorID: 1b9e4dc6-f8c0-419f-8785-8065bcff7284 TimeToLive: 3981 (0x00000F8D) Status: 0x00000000 (StorageQoSStatusOk) MaximumIoRate: 100 (0x0000000000000064) MinimumIoRate: 0 (0x0000000000000000) MaximumBandwidth: 200 (0x00000000000000C8) BaseIoSize: 8192 (0x00002000) Reserved: 0 (0x00000000)