Changes

{{Level|Advanced}}

{{Level|Advanced}}

{{Warning box|Get it right or you will lose data. Take a backup, and keep in mind if you commit a mistake you can loose a whole hard disk, mainly if you switch /dev/sda with /dev/sdb for example}}

SME Servers Raid Options are largely automated, if you built your system with a single hard disk simply logon as ''admin'' and select ''Disk Redundancy'' to add a new drive to your RAID1 array. The same procedure is used if you have a disk failure in a RAID array and you have replaced that failed disk.

{{note box|SME Servers Raid Options are largely automated, if you built your system with a single hard disk, or have a hard disk failure, simply logon as ''admin'' and select ''Disk Redundancy'' to add a new drive to your RAID1 array.

But with the best laid plans things don't always go according to plan, these are the processes required to do it manually.

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

=== Is the Disk Partitioned Correctly ? ===

Here two disks are partitioned identically

Here two disks are partitioned identically

===== message Log showing Grub errors during the processus of installation=====

===== message Log showing Grub errors during the processus of installation=====

If we try to install the grub we will have these errors messages

If we try to install grub you will see these errors messages

  add_drive_to_raid: Waiting for boot partition to sync before installing grub...

  add_drive_to_raid: Waiting for boot partition to sync before installing grub...

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

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

{{note box|if you use the disk for the first time you can go to the next section otherside you need to erase old partitions before create new one.We suppose you have two existing partitions as is the default partitioning on a SME Server raid1.}}

{{note box|if you are using the disk for the first time you can go straight to the next section otherwise you need to erase the old partitions before you create a new one. We will presume you have two existing partitions as is the default partitioning on a SME Server raid1.}}

=== Delete Existing Partitions ===

=== Delete Existing Partitions ===

=== Create new partitions ===

=== Create new partitions ===

{{note box|Now we will create two partitions for md1 and md2, as it is the default partitioning of SME. You can make another choice to create just one partition if you want a data disk in a raid array. At this point you will give the whole disk to the partition 1. In this case there is no need to give a boot flag (see below the flag "a")}}

{{note box|Now we will create two partitions for md1 and md2, as it is the default partitioning schema of SME. You can make another choice to create just one partition if you want a data disk in a raid array. At this point you will allocate the whole disk to partition 1. In this case there is no need to give a boot flag (see below the flag "a")}}

{{warning box|Note: change the partitions system id to reflect Linux raid autodetect}}

{{warning box|Note: change the partitions system id to reflect Linux raid autodetect}}

== HowTo: Write the GRUB boot sector ==

== HowTo: Write the GRUB boot sector ==

{{note box|The grub on the new disk is necessary to secure the boot sequence}}

{{note box|The new disk requires grub to ensure the boot sequence}}

 

{{Warning box|as the dd command is named "data destroyer" you need to be extremely prudent and sure of the name of source partition and/or destination. At first you should skip the dd command, Step 1 below, and attempt to install grub without it, see Step 2 below. If grub can be installed without using dd, then Step 1 can be discarded. }}

  [root@ ~]# '''dd if=/dev/sda1 of=/dev/sdb1'''

  [root@ ~]# '''dd if=/dev/sda1 of=/dev/sdb1'''

     completions of a device/filename.]

     completions of a device/filename.]

   

   

  grub> '''device (hd0) /dev/sdb'''

  grub> '''device (hd1) /dev/sdb'''

   

   

  grub> '''root (hd0,0)'''

  grub> '''root (hd1,0)'''

   Filesystem type is ext2fs, partition type 0xfd

   Filesystem type is ext2fs, partition type 0xfd

   

   

  grub> '''setup (hd0)'''

  grub> '''setup (hd1)'''

   Checking if "/boot/grub/stage1" exists... no

   Checking if "/boot/grub/stage1" exists... no

   Checking if "/grub/stage1" exists... yes

   Checking if "/grub/stage1" exists... yes

   Checking if "/grub/stage2" exists... yes

   Checking if "/grub/stage2" exists... yes

   Checking if "/grub/e2fs_stage1_5" exists... yes

   Checking if "/grub/e2fs_stage1_5" exists... yes

   Running "embed /grub/e2fs_stage1_5 (hd0)"...  16 sectors are embedded.

   Running "embed /grub/e2fs_stage1_5 (hd1)"...  16 sectors are embedded.

  succeeded

  succeeded

   Running "install /grub/stage1 (hd0) (hd0)1+16 p (hd0,0)/grub/stage2 /grub/grub.conf"... succeeded

   Running "install /grub/stage1 (hd1) (hd1)1+16 p (hd1,0)/grub/stage2 /grub/grub.conf"... succeeded

  Done.

  Done.