Sun Microsystems StorEdge T3+, Installation And Configuration Manual

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118 Sun StorEdge T3+ Array Installation and Configuration Guide • April 2002
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Attribute-intensive NFS file system, version 3
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64-Kbyte data block size
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Data-intensive NFS file system, version 3
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Decision Support Systems (DSS)
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Data Warehouse (DW)
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High Performance Computing (HPC)
Note –
The data block size must be configured before any logical volumes are
created on the units. Remember, this block size is used for every logical volume
created on the unit. Therefore, it is important to have similar application data
configured per unit.
Data block size is universal throughout a partner group. Therefore, you cannot
change it after you have created a volume. To subsequently change the data block
size, you must first delete the volume(s), change the data block size, and then create
a new volume(s).
Caution –
Unless you back up and restore the data on these volumes, it will be lost.
Mirrored Cache Enabling
By enabling mirrored cache, you can safeguard cached data if a controller fails.
Note – Mirrored cache is possible only in a redundant enterprise configuration.
Cache Allocation Configuration
Cache is allocated based on the read/write mix and it is dynamically adjusted by the
controller firmware, based on the I/O profile of the application. If the application
profile is configured for a 100 percent read environment, then 100% of the cache is
used for reads. If the application profile has a high number of writes, then the upper
limit for writes is set to 80 percent.