HP Surestore Disk Array 12h System Administrator's Guide for HP-UX, MPE, and W - Page 119

Tips for Configuring the Disk Array On MPE

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MPE Managing the HP SureStore E Disk Array 12H on MPE Tips for Configuring the Disk Array On MPE Tips for Configuring the Disk Array On MPE Before installing a new disk array, you should determine what is more important for your operating environment-performance or capacity. This decision will influence how you configure the disk array hardware. There are several configuration options that impact the performance of the disk array. Table 15 identifies the various configuration options, their impact on disk array performance, and any considerations regarding disk array capacity. NOTE! Overall system performance is a complex issue influenced by many factors. The configuration options described here will increase the potential performance of the disk array. However, the actual performance of the disk array will be determined largely by host demand. AutoRAID technology is particularly suited to I/O-intensive application environments such as OLTP and NFS. It is in these environments that the performance benefits offered by AutoRAID will be fully realized. Configuration Option Number of LUNs per disk array Number of disk arrays per SCSI host adapter Table 15. Configuration Options Impact on Performance and Capacity Performance. Increase the number of LUNs per disk array to improve performance. More LUNs increases the size of the I/O command queue allocated, which increases throughput. The recommended number of LUNs is 4 to 6. Capacity. To allow for future capacity expansion, avoid creating the maximum number of LUNs (8) on the disk array. New capacity is made available through the creation of a new LUN. If the maximum number of LUNs have already been created, it will be necessary to delete and recreate an existing LUN to increase capacity. Performance. Limit the number of disk arrays per host adapter to improve performance. Capacity. If maximum capacity is more important than performance, connect the maximum number of disk arrays to each adapter. 119

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Managing the HP SureStore E Disk Array 12H on MPE
Tips for Configuring the Disk Array On MPE
119
MPE
Tips for Configuring the Disk Array On MPE
Before installing a new disk array, you should determine what is more important for your operating
environment—performance or capacity. This decision will influence how you configure the disk array
hardware. There are several configuration options that impact the performance of the disk array. Table 15
identifies the various configuration options, their impact on disk array performance, and any considerations
regarding disk array capacity.
NOTE!
Overall system performance is a complex issue influenced by many factors. The
configuration options described here will increase the
potential
performance of the disk array.
However, the actual performance of the disk array will be determined largely by host demand.
AutoRAID technology is particularly suited to I/O-intensive application environments such as
OLTP and NFS. It is in these environments that the performance benefits offered by AutoRAID
will be fully realized.
Table 15. Configuration Options
Configuration
Option
Impact on Performance and Capacity
Number of LUNs
per disk array
Performance
. Increase the number of LUNs per disk array to improve
performance. More LUNs increases the size of the I/O command queue
allocated, which increases throughput. The recommended number of
LUNs is 4 to 6.
Capacity
. To allow for future capacity expansion, avoid creating the
maximum number of LUNs (8) on the disk array. New capacity is made
available through the creation of a new LUN. If the maximum number of
LUNs have already been created, it will be necessary to delete and
recreate an existing LUN to increase capacity.
Number of disk
arrays per SCSI
host adapter
Performance
. Limit the number of disk arrays per host adapter to
improve performance.
Capacity
. If maximum capacity is more important than performance,
connect the maximum number of disk arrays to each adapter.