External Storage XP user guide 131
presentation to the XP12000/XP10000. For example, suppose you want to create a 40 GB (40960 MB)
LU on the MSA for use as XP12000/XP10000 external storage. If you request only the exact size needed,
the ACU optimizes the LU to a size of 40959 MB, which is 1 MB smaller than needed. In this case, the
optimization algorithm the ACU uses can be compensated for by specifying a size of 40963 MB, which
results in the correct size of 40960 MB (40 GB).
Figure 66 Defining MSA LUs with ACU
Selective Storage Presentation
You must institute LUN security on MSAs using the ACU Selective Storage Presentation (SSP) feature
(Figure 67). Use SSP to limit access to individual MSA LUs (in this case, logical drives 1 and 2) by selected
host (or XP12000/XP10000) HBA world wide names. When using SSP, set the operating system mode
corresponding to the XP12000/XP10000 array port WWN to TRU64. For more information about
configuring the MSA using the ACU, see the ACU Online User Guide.
Figure 67 Configuring SSP with ACU
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