Create FlashCopy Logical Drive Wizard - Specify FlashCopy Repository Capacity

A stores flashcopy metadata (data about the flashcopy) and any data needed during the life of the to maintain an accurate point-in-time image of the .


Important:

In most situations, the default value of 20 percent is an ample capacity for your flashcopy repository logical drive.

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 base logical drive and how long you need to keep the flashcopy logical drive. In general, choose a larger capacity for the flashcopy repository logical drive if one or both of these conditions exist:

Use historical performance monitor data or other operating system utilities to help you determine typical I/O activity to the base logical drive.


Note:

The absolute minimum size that a flashcopy repository logical drive can be is 8 MB. By default, the size of the flashcopy repository logical drive defaults to 20 percent of the base logical drive. 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 flashcopy repository logical drive, accept the default. Remember that a warning is issued when the flashcopy repository logical drive reaches a certain percentage full, which is called a . You can set the threshold level when you create a flashcopy logical drive by using the Advanced path, but the default threshold level is 50 percent on the Simple path.

If you receive a warning and determine that the flashcopy repository logical drive is in danger of filling up before you are finished with the flashcopy logical drive, you can increase the capacity of the flashcopy repository logical drive by selecting Logical Drive >> Increase Capacity . If the flashcopy repository logical drive fills up before you are finished with the flashcopy, the full conditions of the flashcopy repository logical drive specify what action to take.

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