How to Create and configure RAID?


Hot Swap:-  Hot swap is the replacement of hard disk. If hard disk got faulty then  You can easily replace hard disk in running environment without stopping , shutting down, or rebooting the server. It is plug & Play device.


IDE:- IDE Stands for Integrated Device Electronics. It is commonly known as ATA or PATA (Parallel ATA). It was first developed by Western Digital and Compaq in 1986 for compatible Hard Drive for IBM Computers. It can run 5800 and upto 7200 rpm & transfer rates of 16.7 Mbps.

 

SATA:- SATA Stands for "Serial Advance Technology Attachment". SATA is a computer bus interface that connects host bus adapters to mass storage devices such as hard disk drives, optical drives, and solid-state drives. SATA transfer rates is high rather than IDE.

 

SCSI:-  SCSI stands for "Small Computer System Interface".

SCSI is most commonly used for hard disk drives & tape drives but SCSI can connect a wide range of other devices. SCSI is a set of standards for physically connecting and transferring data between computers and devices. SCSI is a set of parallel interface standards developed by the  (ANSI) American National Standards Institute for attaching printers, disk drives, scanners and other peripherals to computers.

It  is supported by all major operating systems. It can run at 15,000 RPM and support transfer rates of 20 Mbps.

 

Redundant  Array of Inexpensive Disk configurations.

FD is the code of RAID.

 

 

 

FD

FD

FD

 

 

# fdisk  -l

#fdisk  /dev/sd1

=> n

=> Press Enter

=> +512M

=> Press t

=> :12

=> fd


#mdadm -C /dev/md0 -n 3(No of Partition) -l 5(Level of RAID) /dev/sda{11,12,13}

#mkfs.ext3 /dev/md0

#mkdir /raid

#mount  /dev/md0  /raid

#mount  -a

#vi  /etc/fstab


 /dev/md0  /raid  ext3  default  0  0

:wq then press Enter


 #mount  -a

 => To see any problem in RAID devices.

#mdadm  --details  /dev/md0

=> Format each RAID devices with a filesystem .

# mke2fs  -j  /dev/md0

 =>  RAID devices are named  /dev/md0, /dev/md1, /dev/md3 .


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