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Skip the media check unless you have a reason not to.
Skip the media check unless you have a reason not to.
[[File:pic03.gif|590px|frameless|none|Media check]]
[[File:pic03.gif|590px|frameless|none|Media check]]
Select your language.
In this example we choose English.
[[File:pic04.gif|589px|frameless|none|Media check]]
Click next.
Select your keyboard layout.
In this example we choose U.S. English.
[[File:pic05.gif|587px|frameless|none|Media check]]
Click next.
Select Basic Storage Devices.
[[File:pic06.gif|588px|frameless|none|Media check]]
Click next.
Select Yes, discard any data.
[[File:pic07.gif|590px|frameless|none|Media check]]
Click next.
Select your timezone.
[[File:pic08.gif|589px|frameless|none|Media check]]
Click next.
Select Create Custom Layout.
[[File:pic09.gif|589px|frameless|none|Media check]]
Click next.
You are given a default RAID1 layout which uses the full disk capacity.
This is where we start costomizing the partition layout.
For the example I have two 40GByte SSD disks.
Both disks have a 250MB system partition (sda1 and sdb1) and a larger partition for the rest of the data (sda2 and sdb2).
[[File:pic10.gif|590px|frameless|none|Media check]]
Click next.
Remove all partitions by selecting sda and sdb and selection delete with both.
After that you have a 2 partition free SSD’s like shown below.
You can see the disk is 40959 MB in size.
[[File:pic11.gif|590px|frameless|none|Media check]]
Now, Over Provisioning usually is set somewhere between 5% and 25% and like said before, there is no right value to set for Over Provisioning.
Usually people set it at 10% and that is what most SSD tools advise. Setting it lower than that will age your SSD disk faster and will compromise your SSD’s performance.
If you are rather safe that sorry and the diskcapacity of your RAID1 set is not an issue you could set it to 15% or 20%.
Setting it higher seems like overkill to me.
In our example we will use 10% Over Provisioning.
The system (250MB) and swap (4064MB) partitions will be the same size as in the default setting.
That will make the size of the larger data partition: 40959MB x 0,9 = 36863MB – 250MB = 36613MB.
We will start bij partitioning disk sda.
Select sda and click create.
Select RAID Partition and click create.
Set all options like shown in the folowing screen and select OK:
[[File:pic12.gif|293px|frameless|none|Media check]]
The size of the partition (250MB) will be the same whatever size SSD you will be using.
Under sda select the Free space and click create.
Select RAID Partition and click create.
Set all options like shown in the folowing screen and select OK:
[[File:pic13.gif|295px|frameless|none|Media check]]
The size of the partition will be 90% of the SSD size - 250MB.
So this size will depend on the size SSD you are using and using 10% Over Provisioning.
Now we will do the same for the disk sdb.
Select sdb and click create.
Select RAID Partition and click create.
Set all options like shown in the folowing screen and select OK:
[[File:pic14.gif|295px|frameless|none|Media check]]
The size of the partition (250MB) will be the same whatever size SSD you will be using.
Under sda select the Free space and click create.
Select RAID Partition and click create.
Set all options like shown in the folowing screen and select OK:
[[File:pic15.gif|294px|frameless|none|Media check]]
The size of the partition will be 90% of the SSD size - 250MB.
So this size will depend on the size SSD you are using and using 10% Over Provisioning.
Select Hard Drives and select create.
Select RAID Device and click create.
Set all options like shown in the folowing screen and select OK:
[[File:pic16.gif|239px|frameless|none|Media check]]
Make sure you select both system partitions sda1 and sdb1 witch both are 250MB.
Select Hard Drives and select create.
Select RAID Device and click create.
Set all options like shown in the folowing screen and select OK:
[[File:pic17.gif|240px|frameless|none|Media check]]
Make sure you select both system partitions sda2 and sdb2.
Under RAID Devices select md1 and click create.
Select LVM Volume Group and click create.
Select Add and set all options like shown in the folowing screen and select OK:
[[File:pic18.gif|323px|frameless|none|Media check]]
Set the swap size the same as the default setting that was presented to you earlier.
Select Add again and set all options like shown in the folowing screen and select OK:
[[File:pic19.gif|323px|frameless|none|Media check]]
Set the size the same as the maximum size shown in the same window.
Select OK again in this window to start the installation.
[[File:pic20.gif|323px|frameless|none|Media check]]
The RAID1 set you just created is shown now.
Notice that both sda and sdb have 10% of free space now.
[[File:pic21.gif|592px|frameless|none|Media check]]
Click next.
Select Write changes to disk.
[[File:pic22.gif|235px|frameless|none|Media check]]
After the partitioning/formatting has finished you will see the screen below:
[[File:pic23.gif|593px|frameless|none|Media check]]
Click next.
The packages will now be installed.
[[File:pic24.gif|594px|frameless|none|Media check]]
After some time your installation will be completed and you are asked to reboot:
[[File:pic25.gif|592px|frameless|none|Media check]]
Click Reboot.
After reboot, finish your SME configuration as you are used to, set an admin password, IP-settings and so on…
Login to your server with user root and use the command cat /proc/mdstat to check if your RAID1 set is synchronising:
[[File:pic26.gif|591px|frameless|none|Media check]]
After the synchronisation finished the command cat /proc/mdstat output should look something like this:
[[File:pic27.gif|340px|frameless|none|Media check]]
'''Tip:'''
Do not use the admin account to add an SSD disk to a RAID1 set that is custum partitioned to use less than 100% of the disk space from the menu (Option 5. Manage disk redundancy) because the script behind this option will not check how the disk that needs to be cloned is partitioned.
The script will add the disk but will partition it using 100% of the disk space even when the first SSD disk in the RAID1 set is partitioned using less than 100% of the disk space.
