Mirrored Volume & Disk Duplexing Definition
Mirrored volume needs two identical disks even these don’t have same amount of space but it is advised that the model of disks is same from the same vendor. Mirrored volume offer fault tolerance. It creates a copy of entire information, which is written to the volume, with one copy on each physical disk. So when one disk is fails, other one will take its place. But, when this happens, fault tolerance no longer exists. We have to break the mirror then we can create a new mirrored volume with other disk to restore fault tolerance. It is not expandable and this volume provides 50 percent disk utilization. This volume gives negative impact on performance due to overhead of writing on dual disks at a time.
Disk Duplexing is another form of fault tolerant in mirroring. Disk duplexing is the same like mirroring; except every disk in mirror is linked to a different disk controller. This gets rid of the disk controller as a single point of breakdown. Duplexed disks come into view to the Operating System the same as mirrored; if we have duplexed disks, they will be publicized as mirrored in the Disk Management Console.
Conditions Those Must be Met In Order To Start Mirroring
When We Have To Use Mirrored Volume?
We can use mirrored volume in the given conditions:
Create Mirrored Volume Windows Server 2003
Step 1: Right-click the simple volume that we want to mirror and select Add Mirror from the menu.
Step 2: On the next we have to select location to hold a mirror of selected drive. And select the disk on which we want to create the copy of mirror.
Step 3: Click the Add Mirror and the created mirror will appear.
When mirror is created, the Disk Management console will show the same drive letter of the both volumes that make up in the mirror.
Video for Creating Mirrored Volume in Windows Server 2003
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