Dell EMC Metro node 7.0.1 Online Help

Use the Create Extents wizard to create extents from selected storage volumes. By default, metro node creates one extent equal to the size of the selected storage volume. However, you can create an extent that is less than the capacity of the storage volume, and use the unused capacity later. You can create a maximum of 128 extents per storage volume.

Best practices

• If the storage volume is larger than the wanted virtual volume, create an extent the size of the wanted virtual volume. Do not create smaller extents, and then use different RAID types to concatenate or stripe the extents.
• If the storage volume is smaller than the wanted virtual volume, create a single extent per storage volume, and then use devices to concatenate or stripe these extents into a larger device.

When a storage volume fails to create an extent

The View Results dialog box shows any storage volumes that failed to complete the operation. It may happen for any of the following reasons:

• The storage volume may have become unreachable shortly before or during the operation.
• The storage volume may have started to return read or write failures on other extents that have already been exported as virtual volumes.

If it occurs, investigate the status of the storage volume in the Storage volumes view and proceed accordingly.