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Dell EMC Metro node 7.0.1 Administrator Guide

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Volume Expansion

Perform volume expansion using one of the following techniques:

  • The virtual-volume expand CLI command.See the CLI Guide for the metro node for detailed information about this command.
  • Expand a virtual volume using the Unisphere. See the Online Help for the metro node for complete steps.

During volume expansion, using the storage-volume method, ensure that:

CAUTION:Performing a major host operation (such as a LIP reset, for example) in order to detect a change in volume size presents risk to volumes accessed by the host. It is best to avoid such resource intensive operations during volume expansion.
  • Expansion initialization traffic occurs on disk areas that are not performing host I/O. In addition, the amount of time taken to initialize the newly added capacity depends on the performance of the array hosting that is the storage volumes. However, the expected performance is still faster than the time taken to rebuild a volume.
  • Across distributed RAID 1 devices, the initialization process does not consume WAN data bandwidth as each cluster performs its initialization locally.
  • On RAID 1 and distributed RAID 1 devices, metro node ensures that all RAID 1 legs have consistent information on the expanded space.
  • The level of redundancy on RAID 1 and distributed RAID 1 device geometries is maintained through the expansion and initialization process.
  • The newly expanded virtual volume capacity will be available to use by hosts when the initialization process has finished.
  • If metro node has claimed the storage volumes as thinly provisioned, the initialization process will not affect the underlying provisioning of the additional capacity reported to metro node.

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