CLI Guide

Table 7. advanced-settings-table properties (continued)
Name Type Description
• 0: Disabled
• 1: Enabled
random-io-performance-
optimization
string Shows whether random I/O performance optimization is enabled or disabled.
random-io-performance-
optimization-numeric
uint32
• 0: Disabled
• 1: Enabled
cache-flush-timeout string Shows whether the cache flush timeout is enabled or disabled.
cache-flush-timeout-numeric uint32
• 0: Disabled
• 1: Enabled
cache-parameter
This basetype is used by show cache-parameters on page 163, when a volume is specified, to show volume cache properties.
Table 8. cache-parameter properties
Name Type Description
serial-number string If a volume is specified, its serial number.
volume-name string If a volume is specified, its name.
write-policy string If a volume is specified, its cache write policy.
• write-back: Write-back caching does not wait for data to be completely written
to disk before signaling the host that the write is complete. This is the preferred
setting for a fault-tolerant environment because it improves the performance of
write operations and throughput.
• write-through: Write-through caching significantly impacts performance by
waiting for data to be completely written to disk before signaling the host that the
write is complete. Use this setting only when operating in an environment with low
or no fault tolerance.
write-policy-numeric uint32 Numeric equivalents for write-policy values.
• 0: write-through
• 1: write-back
cache-optimization string If a volume is specified, its cache optimization mode.
• standard: This controller cache mode of operation is optimized for sequential and
random I/O and is the optimization of choice for most workloads. In this mode, the
cache is kept coherent with the partner controller. This mode gives you high
performance and high redundancy.
• no-mirror: In this mode of operation, the controller cache performs the same as
the standard mode with the exception that the cache metadata is not mirrored to
the partner. While this improves the response time of write I/O, it comes at the cost
of redundancy. If this option is used, the user can expect higher write performance
but is exposed to data loss if a controller fails.
cache-optimization-numeric uint32 Numeric equivalents for cache-optimization values.
• 0: standard
• 2: no-mirror
read-ahead-size string The read-ahead cache setting of the volume.
• Disabled: Read-ahead is disabled.
286 API basetype properties