Navisphere Command Line Interface (CLI) Reference - VMware Communities

LUN Expansion (MetaLUN) CommandsFigure 3 depicts a LUN using stripe expansion to add two LUNs. Theresult is a metaLUN with a single component consisting of all threeLUNs with the data on the base LUN re-striped across all threeLUNs.EMC2705Figure 3Sample stripe expansionFigure 4 depicts a LUN using concatenate expansion to add twoLUNs. The result is a metaLUN with two components. The firstcomponent is the base LUN. The second component consists of twonew LUNs striped together, but not striped to the first component.EMC2706Figure 4Sample concatenate expansionNote: EMC does not recommend that you expand LUN capacity byconcatenating LUNs of different RAID types. Do this only in an emergencysituation when you need to add capacity to a LUN and you do not haveLUNs of the same RAID type or the disk capacity to bind new ones.Concatenating metaLUN components with a variety of RAID types couldimpact the performance of the resulting metaLUN. Once you expand a LUN,you cannot change the RAID type of any of its components withoutdestroying the metaLUN. Destroying a metaLUN unbinds all LUNs in themetaLUN, and therefore causes data to be lost.327