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SANtricity 11.6
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What do I need to know before increasing my reserved capacity on a mirrored pair volume?


Typically, you should increase reserved capacity when you receive a warning that the reserved capacity for a mirrored pair is becoming full. You can increase reserved capacity only in increments of 8 GiB.

For asynchronous mirroring operations, reserved capacity is typically 20 percent of the base volume. Choose a larger capacity for reserved capacity if one or both of these conditions exist:

  • You intend to keep the mirrored pair for a long period of time.

  • A large percentage of data blocks will change on the primary volume due to heavy I/O activity. Use historical performance data or other operating system utilities to help you determine typical I/O activity to the primary volume.

You can increase the reserved capacity for a mirrored pair by performing one of these actions:

  • Adjust the capacity percentage for a mirrored pair volume by selecting Storage  Pools and Volume Groups and then clicking the Reserved Capacity tab.

  • Create a new volume using free capacity that is available on a pool or volume group.

    If no free capacity exists on any pool or volume group, you can add unconfigured capacity in the form of unused drives to a pool or volume group.