3.3-linux Disk Management

Linux System Management

Disk Management, File system management

RAID Fundamentals principle, LVM2

Network management: TCP/IP protocol, linux Network properties configuration

Package Management: Rpm,yum

Process Management: Htop,glance,tsar, etc.

Sed and awk

Linux system Boot Process

Kernel Management Basics: compiling kernels, modules

Linux system cropping

Kernel+busybox

Homework: LFS

Linux Disk Management

I/O Ports (interface): I/O device address

All documents:

Open (), read (), write (), close ()

Block devices: block, Access unit "blocks", disk

Character device: Char, Access unit "character", keyboard

Device files: A driver that is associated to a device that can communicate with the corresponding hardware device

Device number:

Main device number: Major numbers, identifying device types

Second device number: Minor numbers, identifying different devices under the same type

HDD Interface type:

Parallel:

ide:133mb/s

scsi:640mb/s

Serial:

sata:6gbps

sas:6gbps

usb:480mb/s

Rpm:rotations per minute

/dev/dev_file

Device file naming for disk devices

Ide:/dev/hd

Scsi,sata,sas,usb:/dev/sd

Different devices: A-Z

/dev/sda,/dev/sdb,......

Different partitions on the same device: ...

/dev/sda1,/dev/sda2 ...

Mechanical HDD:

Track: Tracks

Cylinder: Cylinder surface

Sector: Sector (512bytes)

How to Partition:

According to the cylinder to divide

0 Track 0 Sector: 512bytes

Mbr:master Boot Record (Master boot recording)

446bytes:boot Loader

64bytes: Partition Table

16bytes: Identify a partition

2bytes:55aa

4 primary partitions or 3 primary partitions +1 extended partitions (n logical partitions)

Question: Uefi,gpt?

Partition management tool: Fdisk,parted,sfdisk

Fdisk: Up to 15 partitions can be managed for a single drive

# fdisk-l [-u] [device ...] List disk Partitions

# fdisk Device Execution partition

Command Action

A toggle a bootable flag

b Edit BSD Disklabel

C Toggle the DOS compatibility flag

D Delete a partition (delete partition)

L list known partition types (list partition types)

M Print this menu (Get Help)

n Add a new partition (create partition)

o Create a new empty DOS partition table

P Print the partition table (shows existing partitions)

Q Quit without saving changes (discard update and exit)

s create a new empty Sun Disklabel

t change a partition ' s system ID (adjust partition ID)

U Change display/entry units

V Verify the partition table

W Write table to disk and exit (writes to disk and exits)

X Extra functionality (experts only)

See if the kernel has identified a new partition

# cat/proc/partitions

Notifies the kernel to re-identify the new partition

(1) # partx-a/dev/device

-N m:n

or m,m:,:n

(2) # kpartx-a/dev/device

-f:force

CentOS 5: Using Partprobe

Partprobe [/dev/device]

3.3-linux Disk Management