When you create a RAID array, you can protect it from failure by setting one or more Spares to it.
When you add a Spare to an array, you can add it as "Dedicated Spare" (as we did in our "Adaptec SmartRAID 3154-8i8e - Automatic reconstruction with a dedicated Hot Spare (Dedicated Spare)" tutorial), but you can also add it as "Auto replace Spare" (which reduces the total time required for rebuilding and calculating parity in the event of a failure of a hard drive in the array).
As explained previously, Hot Spares can be defined as "Dedicated Spare" or "Auto-Replace Spare".
In the case of this tutorial, we will configure it as "Auto-Replace Spare", which means that :
In summary, the limitations of Hot Spares are :
For more information about these limitations, refer to our previous tutorial : Adaptec SmartRAID 3154-8i8e - Automatic reconstruction with a dedicated Hot Spare (Dedicated Spare).
The procedure is identical to the one we used for "Dedicated Spare" type Spares.
So, refer to steps 2 to 5 included.
To add a physical disk as an "Auto-Replace Spare", the procedure is identical to step 6 of our previous tutorial, except that you will need to select "Auto-Replace Spare" after selecting the desired physical disk(s).
To define a physical disk as Auto Replace Spare via the maxView Storage Manager web interface, the procedure is identical to step 7 of our previous tutorial, except that you will have to select "Auto Replace".
To find out which Spares have been added to your cluster, go to "Array Configuration -> Manage Arrays -> [Array name] -> [Logical drive name]".
Press the "CTRL + S" keys and you will see the list of "Auto-Replace Spare Drives" displayed.
If you want to verify that your array is protected by your Spare using the "maxView Storage Manager" web interface, select your logical drive and you will see it appear in the "Hot Spare Drive(s)" section as "Auto Replace Spare".
If you select the physical disk defined as Spare, you will see that its status is "Auto Replace Hot Spare", that its configuration type is "Spare" and that it protects your array "A".
If you look in the "Disk Utilities" section of ACU, you will see that the physical disk defined as Spare belongs to your array.
As described in step 10 of our previous tutorial.
If you select your Microsemi Adaptec SmartRAID controller on the left, you will see that it has : 4 hard disk drives, 3 of which are for storage (Data) and another as Spare.
If you look in the "Resources" tab of your Microsemi Adaptec SmartRAID controller, you will see that the status of the disk is set as Spare is "Auto Replace Spare".
If you select the array protected by this Spare, you will see that the Spare Rebuild Mode is : Auto Replace.
If you look in the "Resources" tab of your array, you will find your Spare in the "Spare Drive(s)" list.
This indicates that it's configured as a Spare for this cluster, but is on standby since all members (physical disks) of your array are in optimal state.
If you select a logical drive of the array protected by your Spare, you will see that it's protected by a Hot Spare.
In the right column, you will also see on which port it's connected (in our case : Slot 3 - CN4) and what type of Hot Spare it is : Auto Replace Hot Spare.
In the event of a hard drive failure, the error message (Drive Improperly Connected) will be identical to that displayed with a Dedicated Spare.
When you start your computer, an error message will appear asking you to press CTRL + H to set your logical drive status to "degraded".
Once you have pressed these 2 keys, the status will automatically be : Rebuilding.
If you go to the configuration tool of your Microsemi Adaptec SmartRAID controller when starting your computer / server, you will see that your logical drive is being rebuilt (Rebuilding) and that your controller will have replaced the failed physical drive with your Spare (and vice versa).
Our "Auto Replace Spare" connected to the "CN4:01:03" port has therefore become a permanent member of our array and is being rebuilt (Rebuild).
And our failed disk therefore became the "Auto Replace Spare".
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