After we extended the volume in storage array, in Failover cluster, it shows the volume is of 30.0 TB.
If we right click this volume, we will see the capacity of this volume is 15TB
But disk management console shows that this volume is of 15 TB. No part to extend.
Note in the first screenshot, it says “Chkdsk scan needed on the volume”.
What is going on here?
Follow the instruction of “Chkdsk scan needed on the volume”, as the following:
After this, we can see the unallocated part of the volume.
This volume cannot be extended, since it is reserved by failover cluster.
To fix this, we should:
1. Remove this disk from CSV.
2. Remove this disk from failover cluster.
3. Online this disk in disk management console.
4. Then we can extend the volume and then add it back to the failover cluster.
Now the problem is fixed.
原文：http://www.cnblogs.com/awpatp/p/5182082.html