Xsan: Guidelines for volume expansion

  • Last Modified: November 11, 2008
  • Article: HT2769
  • Old Article: 303570

Summary

When adding LUNs to an Xsan volume, follow these guidelines:

Products Affected

Xsan

  • Deciding Bandwidth Expansion and Storage Expansion
    Adding LUNs to an existing storage pool will increase both the capacity of a volume as well as the amount of data that can be written to a volume per unit of time, so it's known as "bandwidth expansion." Alternately, adding LUNs to a new storage pool will increase the capacity of a volume, but it will not increase bandwidth, so it's known as "storage expansion."
     
  • Verifying the volume
    Always verify the Xsan filesystem's integrity before and after adding LUNs to the filesystem.
     
  • After Bandwidth Expansion
    If you have added new LUNs to an existing storage pool, run the following command in the Terminal after expanding the Xsan volume:
    $ sudo snfsdefrag -dr /Volumes/<Volume_Name>
Not helpful Somewhat helpful Helpful Very helpful Solved my problem