8
Sun StorEdge 3000 Family Best Practices Manual
• May
2005
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In a single-controller configuration, disable the Write-Back Cache feature to avoid
the possibility of data corruption in the event of a controller failure. This will have
a negative effect on performance. To avoid either issue, use dual controllers.
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Using two single-controllers in a clustering environment with host-based
mirroring provides some of the advantages of using a dual controller. However,
you still need to disable the Write-Back Cache in case one of the single controllers
fails and you want to avoid data corruption. For this reason, a dual-controller
configuration is preferable.
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Prior to creating logical drives and mapping them to host channels, set the
appropriate cache optimization and controller channel IDs. Reset the controller
after these configuration parameters have been set.
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For best performance and RAS, create logical drives across expansion units.
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To avoid disruptions to other hosts sharing the same array, do not share a logical
drive among multiple hosts.
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Use either local or global spare drives when creating logical drives. Any free drive
can be designated as a spare and more than one drive can be used as a spare.
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The maximum number of LUNs is 128.
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Power-up the equipment in the following order:
a. Expansion units
b. RAID array
c. Host computers
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Install Sun Storage Automated Diagnostic Environment (StorADE) software.
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Connect the Ethernet management ports to a private Ethernet network.
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After completing the configuration of the array, save the configuration using the
firmware “Save nvram to disks” menu option and the Sun StorEdge
Configuration Service Console's “save configuration” utility.
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Partial or complete loss of data can be caused by the presence of media read error
conditions on physical disk drives. The impact varies, depending on RAID level.
To minimize availability issues caused by possible media read error conditions,
enable Media Scan frequently (at least once every thirty days) on logical drives.
