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Linux+ Chapter 6
Linux+ Chapter 6
51
Computer Networking
Undergraduate 1
02/16/2013

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Term
For what was SCSI designed?
Definition
A way to connect multiple peripherals to the system in a scalable, high-speed manner.
Term
What are the three types of SCSI disk configurations?
Definition
-Parallel SCSI
-Serial attached SCSI
-iSCSI
Term
Which SCSI technology is considered the traditional SCSI technology?
Definition
Parallel SCSI
Term
How are devices attached to the SCSI controller card?
Definition
Via one cable with several connectors for the devices to plug into.
Term
What prevents signal bounce on a SCSI cable?
Definition
Each end of the cable must be terminated with a device that stops signals from being perpetuated.
Term
How are SCSI devices uniquely identified by the system?
Definition
-SCSI ID
-Target ID
Term
How many SCSI devices can most controllers support?
Definition
15 devices
Term
In what order are Parallel SCSI devices prioritized?
Definition
The highest priority device is 7, followed by 6,5,4,3,2,1,0,15,14,13,12,11,10,9, and 8.
Term
What is LUN and what does it do?
Definition
(Logical Unit Number)Some SCSI devices act as a gateway to other devices, if this is the ease, each device is associated with a LUN.
Term
What is SAS? How many disks can it support and at what speed?
Definition
(Serial Attached SCSI)Up to 65,535 SAS hard disks that can transfer data at up to 768 MB/s.
Term
How is SAS configuration performed?
Definition
It is performed automatically by the SCSI controller, but can be changed manually if you access the SCSI BIOS.
Term
IEEE 1394 devices are treated how by the Linux OS?
Definition
Firewire hard disks are not supported for hosting the Linux OS during installation.
Term
What is iSCSI?
Definition
Internet SCSI
Term
The computers that use the same iSCSI target are said to be what?
Definition
Storage Area Network(SAN)
Term
To implement iSCSI, what must you select at installation?
Definition
Specialized Storage Devices
Term
Why should partitions be spread across several different hard disks?
Definition
To minimize the impact of a hard disk failure.
Term
Why implement RAID?
Definition
-Create a fault-tolerant system
-Speed up access to hard disks
-Combine multiple hard disks into a single volume
Term
What is RAID?
Definition
Redundant array of independent disks
Term
How many basic RAID configurations are there? How are they named?
Definition
-7 basic RAID configurations
-0 to level 6
Term
Is RAID level 0 fault tolerant?
Definition
NO
Term
What is spanning?
Definition
Consists of two hard disks that the system sees as one large volume.
Term
What is disk striping? What is it's advantage?
Definition
An individual file is divided into sections and saved concurrently on multiple disks, one section per disk.(speeds up disk access)
Term
What happens if one hard disk fails in a RAID level 0 configuration?
Definition
All data lost.
Term
What is RAID level 1? What does it do? Is it fault tolerant?
Definition
Disk mirroring and provides fault tolerance. This results in two hard disks with identical information.
Term
What is a drawback of RAID level 1?
Definition
It is the cost, because you need to purchase twice the hard disk space.
Term
Why isn't RAID level 2 anymore?
Definition
It was a variant of RAID level 0 nad modern disks do this intrinsically
Term
What level of RAID is disk striping with parity? How many hard disks does it require?
Definition
-Minimum of three hard disks
-Level 3 & 5
Term
What is the advantage of RAID level 4 over RAID level 3?
Definition
Level 4 offers greater access speed than RAID level 3.
Term
How is RAID level 5 commonly referred?
Definition
Disk striping with parity
Term
What are the advantages of RAID level 5?
Definition
The parity information is not stored on a separate drive, but is intermixed with data on the drives that make up the set.
Term
What is RAID level 6?
Definition
Is basically the same as RAID level 5, but adds a second set of parity bits for added fault tolerance.
Term
How will multiple RAID disks appear to Fedora?
Definition
Standard hard disk volumes
Term
What is the most common installation method Linux?
Definition
DVD-based
Term
How many CDs are required to install Fedora 13?
Definition
6
Term
How do you prompt the Fedora installation program to perform a nonstandard installation and prompt you for the location of the installation files?
Definition
Press TAB on your keyboard and add ask method to the end of the boot options line.
Term
What are some of the protocols that can be used to share the Linux installation ISO for a network based installation?
Definition
-Network File System(NFS)
-File Transfer Protocol(FTP)
-Hypertext Transfer Protocol(HTTP)
Term
What is the script file called that can be used to automate the installation of Linux? What is the actual file?
Definition
-Kickstart file
-Contains the choices you made during the installation program.
Term
What is the automated installation script contain, by default?
Definition
Sections on the system configuration, disk partitioning, and package selection.
Term
In the automated configuration file, what are the lines that start with the "#" character?
Definition
# Symbol is a comment line and is ignored by the installation program.
Term
What is the utility used to make major changes to the kickstart file? What command installs this utility?
Definition
-kickstart configurator
-yum install system-config-kickstart
Term
How do you implement the kickstart file for a new installation?
Definition
Once you have a kickstart file, place it on a CD, DVD, USB flash memory drive, or hard disk partition and boot from the Fedora DVD.
Term
What are three categories of installation problems?
Definition
-Problems starting the installation
-Problems during installation
-Problems after installation
Term
What are some of the problems that can occur at the start of the installation?
Definition
The boot order in the BIOS is set incorrectly.
Term
What are some of the problems that can occur during installation?
Definition
-video card
-plug-and-play support
-RAM errors
-Overclocking
-Boot loader on the hard disk
Term
What are some of the problems that can occur after installation?
Definition
-detect hardware properly
-programs were not installed as expected
Term
Where are the installation logs created during installation located?
Definition
-/root/install.log
-/root/install.log.syslog
Term
In which directory can you find information to help verify hardware settings? What is special about this directory?
Definition
-/proc directory
-It is mounted to a special filesystem contained within RAM that lists system information made available by the Linux kernel.
Term
In what log file and directory can you find the hardware detected at system boot?
Definition
/var/log/dmesg logfile
Term
How are old copies of log files managed?
Definition
The system archives old copies of the log files in the /var/log directory and appends the date to them.
Term
What is "System Rescue"? How is it accessed?
Definition
A small bootable Linux kernel and virtual filesystem that you can load into RAM and issued to fix problems. Boot from the Fedora DVD and select Rescue installed system at the initial welcome screen.
Term
In System Rescue, what will the command chroot /mnt/sysimage do?
Definition
Force your system rescue Linux kernel to set the /(root) directory of System Rescue to /mnt/sysimage in order to make it easier to navigate your /(root) filesystem on the hard disk.
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