HP Array Controller HSG V8.7 Software - Manual (Page 92)

3–14 HSG80 User’s Guide
n Mirrorset units are set to WRITEBACK_CACHE by default which
increases a unit’s performance.
n A storageset should only contain disk drives of the same capacity.
The controller limits the capacity of each member to the capacity of
the smallest member in the storageset. Thus, if you combine 9 GB
disk drives with 4 GB disk drives in the same storageset, the 4 GB
disk drive will be the base member size, and you waste 5 GB of
capacity on each 9 GB member.
n Evenly distribute the members across the device ports to balance
load and provide multiple paths as shown in Figure 3–4 on page
3–11.
n Mirrorsets are well-suited for the following:
n Any data for which reliability requirements are extremely high
n Data to which high-performance access is required
n Applications for which cost is a secondary issue
n Mirrorsets are not well-suited for the following applications:
n Write-intensive applications (JBODs are better for this type of
application, but mirrorsets are preferred over Raid5 RADsets.)
n Applications for which cost is a primary issue