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=== Are the Disk Partitioned Correctly ? ===

Here two disks are partitioned identically

 [root@ ~]# '''fdisk -lu /dev/sda; fdisk -lu /dev/sdb'''
 
 Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
 Units = sectors of 1 * 512 = 512 bytes
 
    Device Boot      Start         End      Blocks   Id  System
 /dev/sda1   *          63      208844      104391   fd  Linux raid autodetect
 /dev/sda2          208845  1953520064   976655610   fd  Linux raid autodetect
 
 Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
 Units = sectors of 1 * 512 = 512 bytes
 
    Device Boot      Start         End      Blocks   Id  System
 /dev/sdb1   *          63      208844      104391   fd  Linux raid autodetect
 /dev/sdb2          208845  1953520064   976655610   fd  Linux raid autodetect

==== Example : Incorrecty Partitioned 2nd Disk ====

In this example the partitions are set too close to the start of the disk and there is no room for GRUB to be written, the disk will not boot, there will not be enough room for grub ''staging''

 [root@ ~]# '''fdisk -l /dev/sdb; fdisk -lu /dev/sdb'''
 
 Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
 255 heads, 63 sectors/track, 121601 cylinders
 Units = cylinders of 16065 * 512 = 8225280 bytes
 
    Device Boot      Start         End      Blocks   Id  System
 /dev/sdb1   *           1          13      104384+  fd  Linux raid autodetect
 '''Partition 1 does not end on cylinder boundary.'''
 /dev/sdb2              13      121601   976655647   fd  Linux raid autodetect
 
 Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
 Units = sectors of 1 * 512 = 512 bytes
 
    Device Boot      Start         End      Blocks   Id  System
 /dev/sdb1   *           1      208769      104384+  fd  Linux raid autodetect
 '''Partition 1 does not end on cylinder boundary.'''
 /dev/sdb2          208770  1953520063   976655647   fd  Linux raid autodetect

===== message Log showing Grub errors =====

 add_drive_to_raid: Waiting for boot partition to sync before installing grub...
 add_drive_to_raid: Probing devices to guess BIOS drives. This may take a long time.
 add_drive_to_raid:
 add_drive_to_raid:
 add_drive_to_raid:     GNU GRUB  version 0.95  (640K lower / 3072K upper memory)
 add_drive_to_raid:
 add_drive_to_raid:  [ Minimal BASH-like line editing is supported.  For the first word, TAB
 add_drive_to_raid:    lists possible command completions.  Anywhere else TAB lists the possible
 add_drive_to_raid:    completions of a device/filename.]
 add_drive_to_raid: grub> device (hd0) /dev/sdb
 add_drive_to_raid: grub> root (hd0,0)
 add_drive_to_raid:  Filesystem type is ext2fs, partition type 0xfd
 add_drive_to_raid: grub> setup (hd0)
 add_drive_to_raid:  Checking if "/boot/grub/stage1" exists... no
 add_drive_to_raid:  Checking if "/grub/stage1" exists... yes
 add_drive_to_raid:  Checking if "/grub/stage2" exists... yes
 add_drive_to_raid:  Checking if "/grub/e2fs_stage1_5" exists... yes
 add_drive_to_raid:  Running "embed /grub/e2fs_stage1_5 (hd0)"... failed (this is not fatal)
 add_drive_to_raid:  Running "embed /grub/e2fs_stage1_5 (hd0,0)"... failed (this is not fatal)
 add_drive_to_raid:  Running "install /grub/stage1 (hd0) /grub/stage2 p /grub/grub.conf "... succeeded
 add_drive_to_raid: Done.
 add_drive_to_raid: grub> quit



== HowTo: Partition / Re-Partition a disk ==

=== Delete Existing Partitions ===

 [root@ ~]# '''fdisk /dev/sdb'''
 
 The number of cylinders for this disk is set to 121601.
 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/sdb: 1000.2 GB, 1000204886016 bytes
 255 heads, 63 sectors/track, 121601 cylinders
 Units = cylinders of 16065 * 512 = 8225280 bytes
 
    Device Boot      Start         End      Blocks   Id  System
 /dev/sdb1   *           1          13      104384+  fd  Linux raid autodetect
 Partition 1 does not end on cylinder boundary.
 /dev/sdb2              13      121601   976655647   fd  Linux raid autodetect
 
 Command (m for help): '''d'''
 Partition number (1-4): '''1'''
 
 Command (m for help): '''d'''
 Selected partition 2
 
 Command (m for help): '''w'''
 The partition table has been altered!
 
 Calling ioctl() to re-read partition table.
 Syncing disks.

=== Create new partitions ===

Note: change the partitions system id to reflect Linux raid autodetect

 [root@ ~]# fdisk /dev/sdb
 
 The number of cylinders for this disk is set to 121601.
 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): '''n'''
 Command action
    e   extended
    p   primary partition (1-4)
 '''p'''
 Partition number (1-4): 1
 First cylinder (1-121601, default 1):
 Using default value 1
 Last cylinder or +size or +sizeM or +sizeK (1-121601, default 121601): 13
 
 Command (m for help): '''n'''
 Command action
    e   extended
    p   primary partition (1-4)
 '''p'''
 Partition number (1-4): 2
 First cylinder (14-121601, default 14):
 Using default value 14
 Last cylinder or +size or +sizeM or +sizeK (14-121601, default 121601):
 Using default value 121601
 
 Command (m for help): '''a'''
 Partition number (1-4): '''1'''
 
 Command (m for help): '''t'''
 Partition number (1-4): '''1'''
 Hex code (type L to list codes): '''fd'''
 Changed system type of partition 1 to fd (Linux raid autodetect)
 
 Command (m for help): '''t'''
 Partition number (1-4): '''2'''
 Hex code (type L to list codes): '''fd'''
 Changed system type of partition 2 to fd (Linux raid autodetect)
 
 Command (m for help): '''p'''
 
 Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
 255 heads, 63 sectors/track, 121601 cylinders
 Units = cylinders of 16065 * 512 = 8225280 bytes
 
    Device Boot      Start         End      Blocks   Id  System
 /dev/sdb1   *           1          13      104391   fd  Linux raid autodetect
 /dev/sdb2              14      121601   976655610   fd  Linux raid autodetect
  
 Command (m for help): '''w'''
 The partition table has been altered!
 
 Calling ioctl() to re-read partition table.
 Syncing disks.

== HowTo: Write the GRUB boot sector ==

 [root@ ~]# '''grub'''
 
     GNU GRUB  version 0.95  (640K lower / 3072K upper memory)
 
  [ Minimal BASH-like line editing is supported.  For the first word, TAB
    lists possible command completions.  Anywhere else TAB lists the possible
    completions of a device/filename.]
 
 grub> '''device (hd0) /dev/sdb'''
 
 grub> '''root (hd0,0)'''
  Filesystem type is ext2fs, partition type 0xfd
 
 grub> '''setup (hd0)'''
  Checking if "/boot/grub/stage1" exists... no
  Checking if "/grub/stage1" exists... yes
  Checking if "/grub/stage2" exists... yes
  Checking if "/grub/e2fs_stage1_5" exists... yes
  Running "embed /grub/e2fs_stage1_5 (hd0)"...  16 sectors are embedded.
 succeeded
  Running "install /grub/stage1 (hd0) (hd0)1+16 p (hd0,0)/grub/stage2 /grub/grub.conf"... succeeded
 Done.
 
 grub> '''quit'''
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