Red Hat ENTERPRISE LINUX 4.5.0 Reference Manual page 96

Chapter 5. The proc File System
The primary file in this directory is
SCSI device. From this listing, the type of device, as well as the model name, vendor, SCSI
channel and ID data is available.
For example, if a system contains a SCSI CD-ROM, a tape drive, a hard drive, and a RAID
controller, this file looks similar to the following:
Attached devices: Host: scsi1 Channel: 00 Id: 05 Lun: 00 Vendor: NEC Model:
CD-ROM DRIVE:466 Rev: 1.06 Type: CD-ROM ANSI SCSI revision: 02 Host: scsi1
Channel: 00 Id: 06 Lun: 00 Vendor: ARCHIVE Model: Python 04106-XXX Rev: 7350
Type: Sequential-Access ANSI SCSI revision: 02 Host: scsi2 Channel: 00 Id:
06 Lun: 00 Vendor: DELL Model: 1x6 U2W SCSI BP Rev: 5.35 Type: Processor
ANSI SCSI revision: 02 Host: scsi2 Channel: 02 Id: 00 Lun: 00 Vendor:
MegaRAID Model: LD0 RAID5 34556R Rev: 1.01 Type: Direct-Access ANSI SCSI
revision: 02
Each SCSI driver used by the system has its own directory within
files specific to each SCSI controller using that driver. From the previous example,
and directories are present, since two drivers are in use. The files in each of the
megaraid/
directories typically contain an I/O address range, IRQ information, and statistics for the SCSI
controller using that driver. Each controller can report a different type and amount of
information. The Adaptec AIC-7880 Ultra SCSI host adapter's file in this example system
produces the following output:
Adaptec AIC7xxx driver version: 5.1.20/3.2.4 Compile Options: TCQ Enabled
By Default : Disabled AIC7XXX_PROC_STATS : Enabled AIC7XXX_RESET_DELAY : 5
Adapter Configuration: SCSI Adapter: Adaptec AIC-7880 Ultra SCSI host
adapter Ultra Narrow Controller PCI MMAPed I/O Base: 0xfcffe000 Adapter
SEEPROM Config: SEEPROM found and used. Adaptec SCSI BIOS: Enabled IRQ: 30
SCBs: Active 0, Max Active 1, Allocated 15, HW 16, Page 255 Interrupts:
33726 BIOS Control Word: 0x18a6 Adapter Control Word: 0x1c5f Extended
Translation: Enabled Disconnect Enable Flags: 0x00ff Ultra Enable Flags:
0x0020 Tag Queue Enable Flags: 0x0000 Ordered Queue Tag Flags: 0x0000
Default Tag Queue Depth: 8 Tagged Queue By Device array for aic7xxx host
instance 1:
{255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255} Actual
queue depth per device for aic7xxx host instance 1:
{1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1} Statistics: (scsi1:0:5:0) Device using
Narrow/Sync transfers at 20.0 MByte/sec, offset 15 Transinfo settings:
current(12/15/0/0), goal(12/15/0/0), user(12/15/0/0) Total transfers 0 (0
reads and 0 writes) < 2K 2K+ 4K+ 8K+ 16K+ 32K+ 64K+ 128K+ Reads: 0 0 0 0 0 0
0 0 Writes: 0 0 0 0 0 0 0 0 (scsi1:0:6:0) Device using Narrow/Sync transfers
at 10.0 MByte/sec, offset 15 Transinfo settings: current(25/15/0/0),
goal(12/15/0/0), user(12/15/0/0) Total transfers 132 (0 reads and 132
writes) < 2K 2K+ 4K+ 8K+ 16K+ 32K+ 64K+ 128K+ Reads: 0 0 0 0 0 0 0 0 Writes:
0 0 0 1 131 0 0 0
This output reveals the transfer speed to the SCSI devices connected to the controller based on
channel ID, as well as detailed statistics concerning the amount and sizes of files read or written
by that device. For example, this controller is communicating with the CD-ROM at 20
72
, which contains a list of every recognized
/proc/scsi/scsi
, which contains
/proc/scsi/
aic7xxx/