Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 44)

44 Chapter 2. The /proc File System

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+

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+

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 controller

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

written by that device. By referring to the /proc/scsi/scsi ﬁle, we can see that this controller is

communicating with the CD-ROM at 20 megabits per second, while the tape drive is only connected

at 10 megabits per second.

2.3.8. /proc/sys/

The /proc/sys/ directory is different from others in /proc because it not only provides information

about the system but also allows you to make conﬁguration changes to the kernel. This allows the

administrator of the machine to immediatley enable and disable kernel features.

Warning

Use caution when changing settings on a production system using the various ﬁles in the /proc/sys/

directory. Changing the wrong setting may render the kernel unstable, requiring a reboot of the sys-

tem.

For this reason, be sure you know the valid options for that ﬁle and the expected outcome before

attempting to change a value in /proc/sys/.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 44

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