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Red Hat Enterprise Linux 6 Essentials eBook now available in PDF and ePub formats for only $9.99
RHEL 6 Essentials contains 40 chapters and over 250 pages.

Chapter 9. SCSI Tapset

probe::scsi.ioentry — Prepares a SCSI mid-layer request
probe::scsi.iodispatching — SCSI mid-layer dispatched low-level SCSI command
probe::scsi.iodone — SCSI command completed by low level driver and enqueued into the done queue.
probe::scsi.iocompleted — SCSI mid-layer running the completion processing for block device I/O requests
probe::scsi.ioexecute — Create mid-layer SCSI request and wait for the result
probe::scsi.set_state — Order SCSI device state change
This family of probe points is used to probe SCSI activities. It contains the following probe points:

Name

probe::scsi.ioentry — Prepares a SCSI mid-layer request

Synopsis

scsi.ioentry

Values

disk_major
The major number of the disk (-1 if no information)
device_state_str
The current state of the device, as a string
device_state
The current state of the device
req_addr
The current struct request pointer, as a number
disk_minor
The minor number of the disk (-1 if no information)

Name

probe::scsi.iodispatching — SCSI mid-layer dispatched low-level SCSI command

Synopsis

scsi.iodispatching

Values

device_state_str
The current state of the device, as a string
dev_id
The scsi device id
channel
The channel number
data_direction
The data_direction specifies whether this command is from/to the device 0 (DMA_BIDIRECTIONAL), 1 (DMA_TO_DEVICE), 2 (DMA_FROM_DEVICE), 3 (DMA_NONE)
lun
The lun number
request_bufflen
The request buffer length
host_no
The host number
device_state
The current state of the device
data_direction_str
Data direction, as a string
req_addr
The current struct request pointer, as a number
request_buffer
The request buffer address

Name

probe::scsi.iodone — SCSI command completed by low level driver and enqueued into the done queue.

Synopsis

scsi.iodone

Values

device_state_str
The current state of the device, as a string
dev_id
The scsi device id
channel
The channel number
data_direction
The data_direction specifies whether this command is from/to the device.
lun
The lun number
host_no
The host number
data_direction_str
Data direction, as a string
device_state
The current state of the device
scsi_timer_pending
1 if a timer is pending on this request
req_addr
The current struct request pointer, as a number

Name

probe::scsi.iocompleted — SCSI mid-layer running the completion processing for block device I/O requests

Synopsis

scsi.iocompleted

Values

device_state_str
The current state of the device, as a string
dev_id
The scsi device id
channel
The channel number
data_direction
The data_direction specifies whether this command is from/to the device
lun
The lun number
host_no
The host number
data_direction_str
Data direction, as a string
device_state
The current state of the device
req_addr
The current struct request pointer, as a number
goodbytes
The bytes completed

Name

probe::scsi.ioexecute — Create mid-layer SCSI request and wait for the result

Synopsis

scsi.ioexecute

Values

retries
Number of times to retry request
device_state_str
The current state of the device, as a string
dev_id
The scsi device id
channel
The channel number
data_direction
The data_direction specifies whether this command is from/to the device.
lun
The lun number
timeout
Request timeout in seconds
request_bufflen
The data buffer buffer length
host_no
The host number
data_direction_str
Data direction, as a string
device_state
The current state of the device
request_buffer
The data buffer address

Name

probe::scsi.set_state — Order SCSI device state change

Synopsis

scsi.set_state

Values

state_str
The new state of the device, as a string
dev_id
The scsi device id
channel
The channel number
state
The new state of the device
old_state_str
The current state of the device, as a string
lun
The lun number
old_state
The current state of the device
host_no
The host number

 
 
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