What is raid 1 ? and how to configure in redhat linux server 1


hello guys today we will discuss about RAID 1. RAID 1 is a storage management method .Here we will learn how to implement in redhat linux .RAID 1 is aslo call disk mirroring because this method in used two or more heard drive every heard drive in data copy data same size so call mirroring .RAID 1 is provide full data redundancy .this method is provide very best data back up system .here we learn RAID 1 in redhat linux server .here i used partition if u want u can also real machine.

note if u used in real machine so just follow instruction

1{     #fdisk /dev/sda  is used virtual box  and real machine  if u install or connect external other heard driver so u need #fdisk /dev/sdb its used for external 1 heard disk if u add another add so u used #fdisk /dev/sdc  like this we add heard drive  so used #fdisk /dev/sdb ,#fdisk /dev/sdc #fdisk /dev/sdd ,#fdisk /dev/sde  }

raid 1 configure in linux

 

now we start with partition 

 

[root@localhost ~]# fdisk /dev/sda
The number of cylinders for this disk is set to 4177.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): p
Disk /dev/sda: 34.3 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        3315    26627706   83  Linux
/dev/sda2            3316        3697     3068415   82  Linux swap / Solaris
/dev/sda4            3698        4177     3855600    5  Extended
Command (m for help): m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)
Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
l
First cylinder (3698-4177, default 3698):
Using default value 3698
Last cylinder or +size or +sizeM or +sizeK (3698-4177, default 4177): +200M
Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
l
First cylinder (3723-4177, default 3723):
Using default value 3723
Last cylinder or +size or +sizeM or +sizeK (3723-4177, default 4177): +200M
Command (m for help): p
Disk /dev/sda: 34.3 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        3315    26627706   83  Linux
/dev/sda2            3316        3697     3068415   82  Linux swap / Solaris
/dev/sda4            3698        4177     3855600    5  Extended
/dev/sda5            3698        3722      200781   83  Linux
/dev/sda6            3723        3747      200781   83  Linux
Command (m for help): t
Partition number (1-6): 6
Hex code (type L to list codes): l
 0  Empty           1e  Hidden W95 FAT1 80  Old Minix       bf  Solaris
 1  FAT12           24  NEC DOS         81  Minix / old Lin c1  DRDOS/sec (FAT-
 2  XENIX root      39  Plan 9          82  Linux swap / So c4  DRDOS/sec (FAT-
 3  XENIX usr       3c  PartitionMagic  83  Linux           c6  DRDOS/sec (FAT-
 4  FAT16 <32M      40  Venix 80286     84  OS/2 hidden C:  c7  Syrinx
 5  Extended        41  PPC PReP Boot   85  Linux extended  da  Non-FS data
 6  FAT16           42  SFS             86  NTFS volume set db  CP/M / CTOS / .
 7  HPFS/NTFS       4d  QNX4.x          87  NTFS volume set de  Dell Utility
 8  AIX             4e  QNX4.x 2nd part 88  Linux plaintext df  BootIt
 9  AIX bootable    4f  QNX4.x 3rd part 8e  Linux LVM       e1  DOS access
 a  OS/2 Boot Manag 50  OnTrack DM      93  Amoeba          e3  DOS R/O
 b  W95 FAT32       51  OnTrack DM6 Aux 94  Amoeba BBT      e4  SpeedStor
 c  W95 FAT32 (LBA) 52  CP/M            9f  BSD/OS          eb  BeOS fs
 e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi ee  EFI GPT
 f  W95 Ext'd (LBA) 54  OnTrackDM6      a5  FreeBSD         ef  EFI (FAT-12/16/
10  OPUS            55  EZ-Drive        a6  OpenBSD         f0  Linux/PA-RISC b
11  Hidden FAT12    56  Golden Bow      a7  NeXTSTEP        f1  SpeedStor
12  Compaq diagnost 5c  Priam Edisk     a8  Darwin UFS      f4  SpeedStor
14  Hidden FAT16 <3 61  SpeedStor       a9  NetBSD          f2  DOS secondary
16  Hidden FAT16    63  GNU HURD or Sys ab  Darwin boot     fb  VMware VMFS
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep
1c  Hidden W95 FAT3 75  PC/IX           be  Solaris boot    ff  BBT
Hex code (type L to list codes): fd
Changed system type of partition 6 to fd (Linux raid autodetect)
Command (m for help): p^H^H
Disk /dev/sda: 34.3 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        3315    26627706   83  Linux
/dev/sda2            3316        3697     3068415   82  Linux swap / Solaris
/dev/sda4            3698        4177     3855600    5  Extended
/dev/sda5            3698        3722      200781   83  Linux
/dev/sda6            3723        3747      200781   fd  Linux raid autodetect
Command (m for help): t
Partition number (1-6): 5
Hex code (type L to list codes): fd
Changed system type of partition 5 to fd (Linux raid autodetect)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
[root@localhost ~]# partprobe /dev/sda

After creating partition  we will going to create Raid1

[root@localhost ~]#mdadm   – -create   /dev/md1   – -level=0  – -raid-devices=2    /dev/sda5   /dev/sda6

now u can check your raid1 through # cat /proc/mdstat

[root@localhost ~]# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda5 /dev/sda6
mdadm: array /dev/md0 started.
[root@localhost ~]# cat /proc/mdstate
cat: /proc/mdstate: No such file or directory
[root@localhost ~]# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid0 sda6[1] sda5[1t]
      594176 blocks 64k chunks
unused devices: <none>
[root@localhost ~]#

Thank you 

by vishnu sharma

 

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