44

Chapter 2. The

proc

File System

megaraid

directories are present, as those two drivers are being utilized. The files in each of the

directories typically contain IO address range, IRQ, and statistics for the particular 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

From this screen, you can see the transfer speed to the various SCSI devices connected to the con 

troller based on channel ID, as well as detailed statistics concerning the amount and sizes of files read

or written by that device. For instance, from the output above you can see in the can see that this