Overview
The IO Control Block (IOCB) is used by the device driver to send data and
commands to the fibre channel adapter. These commands are used to send
commands and data to the SAN (fabric (switch), an N_Port or a SCSI/IP target),
If an IOCB was rejected, the status code will give the reason that the
command failed .
DETAIL SENSE DATA
Here below is a cut from the full error log sense template. Click here to see full error template.
RRRR RRRR EEEE EEEE TTCC OOOO NNNN NNNN NNNN NNNN IIII IIII MMMM MMMM LLLL LLLLAIX Version 5.3 and below
AIX 6 and above:
The IOCB command and the completion status
The command field "CD" field contains the IOCB command sent to the adapter.
In same row, the command completion status "S" field contains the completion status
The command "CD" is not needed for problem determination, but here is the list of IOCB commands.
| Completion status "S" |
What it means | What to do |
| 0x0 | successful completion | the IOCB completed successfully, no action required |
| 0x1 | FCP (SCSI) Error | The target device is indicating an SCSI error. This is a target device issue, contact SAN AIX.. |
| 0x2 | Stopped by Remote Port | The target port has stopped the command this is a target device issue. |
| 0x3 | Local Reject (the adapter has rejected the cmd) | Action depends on the local reject code |
| 0x4 | Remote Port sent a reject (P_RJT) | The target port rejected the cmd. This is a target device issue, contact SAN AIX support |
| 0x5 | Fabric sent a reject (F_RJT) | The switch has rejected the cmd. This a switch/SAN issue. |
| 0x6 | Remote Port Sent a P_BSY | The target device is busy. This is a target device issue, contact SAN AIX support. |
| 0x7 | Remote N_Port sent a F_BSY | The switch is busy. This is a switch/SAN issue. |
| 0x8 | Intermediate Response IOCB | The target device has responded with a intermediate response. |
| 0x9 | Received a Link Service Reject (LS_RJT) | The switch has sent a link service reject. This is a switch/SAN issue,.contact SAN AIX support or SAN Central |
| 0xA | Intermediate Response IOCB with Basic Reject (BA_RJT) | The target device has responded with a intermediate reject response. This is a target device issue, contact SAN AIX support. |
DETAIL SENSE DATA
Here below is a cut from the full error log sense template. Click here to see full error template.
| Destination ID | What does this mean |
| 0x 0000 0000 | Unknown Port or Port ID not included |
| 0x FBFF FF00 | Time Server ID |
| 0x FCFF FF00 | Directory Server (DNS) |
| 0x FDFF FF00 | Fabric Controller |
| 0x FEFF FF00 | N_Port identifier for the Fabric F_Port |
| 0x FFFF FF00 | Broadcast address |
If the IOCB command is a extend link service command, the word following
the command block contains the extended link service command.
The word following the IOCB you are looking for is the (LSOC LSOC field, see the sense data below for reference.
AIX Version 5 and below
DETAIL SENSE DATA
Here below is a cut from the full error log sense template. Click here to see full error template.
| Opcode :LSOC LSPC |
Name | Definition |
| 0x 0100 0000 | LS_RJT | Link Service Reject |
| 0x 0200 000 | LS_ACC | Link Service Accept |
| 0x 0300 0000 | PLOGI | N_Port_Login |
| 0x 0400 0000 | FLOGI | F_Port (Fabric) Login |
| 0x 0500 0000 | LOGOUT | Logout (N_Port or Fabric) |
| 0x 0600 0000 | ABTX | Abort Exchange |
| 0x 0700 0000 | RCS | Read Connection Status |
| 0x 0800 0000 | RES | Read Exchange Status block |
| 0x 0900 0000 | RSS | Read Sequence Status Block |
| 0x 0A00 0000 | RSI | Request Sequence Initiative |
| 0x 0B00 0000 | ESTS | Establish Streaming |
| 0x 0C00 0000 | ESTC | Estimate Credit |
| 0x 0D00 0000 | ADVC | Advise Credit |
| 0x 0E00 0000 | RTV | Read Timeout Value |
| 0x 0F00 0000 | RLS | Read Link Error Status Block |
| 0x 1000 0000 | ECHO | Echo |
| 0x 1100 0000 | Test | Test |
| 0x 1200 0000 | RRQ | Reinstate Recovery Qualifier |
| 0x 1300 0000 | REC | Read Concise Exchange status (In current standards, this is a reserved opcode |
| 0x 2000 0000 | PRLI | Process Login |
| 0x 2100 0000 | PRLO | Process Logout |
| 0x 2200 0000 | SCN | State Change Notification |
| 0x 2300 0000 | TPLS | test Process Login State |
| 0x 5000 0000 | PDISC | Discover N_Port Service Parameters |
| 0x 5100 0000 | FDISC | Discover F_Port Service Parameters |
| 0x 5200 0000 | ADISC | Discover Address |
| 0x 5300 0000 | RSNC | Registered State Change Notification |
| 0x 5400 0000 | FARP | FC Address Resolution Request |
| 0x 5500 0000 | FARP | FC Address Resolution Reply |
| 0x 5800 0000 | FAN | Fabric Address Notification |
| 0x 6100 0000 | RSCN | Registered State Change Notification |
| 0x 6200 0000 | SCR | State Change Registration |
| 0x 6300 0000 | RNFT | Report Node FC-4 Types |
| 0x 7800 0000 | RNID | Request Node Identification Data |
| 0x 7D00 0000 | RPSC | Report Port Speed Capabilities |
| Command "CD" |
What it does |
| 0x0C | Queues receive header buffers |
| 0x30 0xB0 |
Creates exchange resource indicator from a remote port indicator |
| 0x31 0xB1 |
Transmits data in one fibre channel sequence |
| 0x01 0x81 |
Received an incoming sequence |
| 0x02 0x82 |
Create and transmit data in one fibre channel sequence |
| 0x03 0x83 |
Create and transmit data in one fibre channel sequence |
| 0x84 | Create and transmit data in one fibre channel sequence |
| 0x85 | Create and transmit data in one fibre channel sequence |
| 0x06 0x86 |
Queue buffers for a receive |
| 0x87 | Queue buffers for a receive |
| 0x08 0x88 |
Continuation of a previous IOCB |
| 0x89 | Return queued buffers |
| 0xC1 | Return queued buffers with received sequence |
| 0xC2 | Creates, transmits payload and waits for a response |
| 0xC3 | Create and transmit data in one fibre channel sequence and wait for a response |
| 0xC6 | Queue for receive |
| 0xC7 | Queue for receive |
| 0xC8 | Continuation entry |
| 0xC9 | Return queued receive |
| 0x8A | Extended links Service (ELS) request |
| 0x8B | Extended links Service (ELS) request |
| 0x8D | Received Extended links Service (ELS) request |
| 0xCD | Received Extended links Service (ELS) request |
| 0x95 | Transmit Extended links Service (ELS) response |
| 0x8C | Abort exchange |
| 0x0E | Abort exchange |
| 0x0F | Abort exchange |
| 0x10 | Close exchange |
| 0x11 | Close exchange |
| 0x12 | Create exchange |
| 0x13 | Create exchange |
| 0x17 | Exchange aborted |
| 0x18 0x98 |
Create write exchange |
| 0x1A 0x9A |
Create write exchange |
| 0x1B 0x9B |
Create read exchange |
| 0x1C 0x9C |
Create read exchange |
| 0x1D 0x9D |
Create exchange |
| 0x1F 0x9F |
Create FCP SCSI target exchange |
| 0x21 0xA1 |
FCP SCSI target read exchange |
| 0x23 0xA3 |
FCP target response |
| 0xA5 | Intermediate response |
| 0x29 | FCP target response |
| 0x2B | Exchange creation notification. |