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Important: In most situations, the 20 percent default value is an ample capacity for your snapshot repository virtual disk.
Use the spinner box to set the desired capacity. The capacity needed varies, depending on the frequency and size of I/O writes to the source virtual disk and how long you need to keep the snapshot virtual disk. In general, choose a larger capacity for the repository if you intend to keep the snapshot virtual disk for a long period of time, if a large percentage of data blocks will change on the source virtual disk during the life of the snapshot virtual disk due to heavy I/O activity, or both. Use historical performance monitor data or other operating system utilities to help you determine typical I/O activity to the source virtual disk.
Note: The absolute minimum size that a snapshot repository virtual disk can be is 8 MB. By default, the size of the snapshot repository virtual disk defaults to 20 percent of the source virtual disk. If there is not enough free capacity for 20 percent, it is set to the highest possible percentage.
If you are not sure how large to make the snapshot repository virtual disk, accept the default. Remember that a warning is issued when the snapshot repository virtual disk reaches a certain percentage full, called a
If you get a warning and determine that the snapshot repository virtual disk is in danger of filling up before you are finished with the snapshot virtual disk, you can increase its capacity by selecting Virtual Disk >> Increase Capacity. If the snapshot repository virtual disk fills up before you are finished with the snapshot, the snapshot repository virtual disk full conditions specify what action to take.