CLI Guide

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.

Read Ahead Size

If a volume is specified, its read-ahead cache setting:

• Disabled: Read-ahead is disabled.

• Adaptive: Adaptive read-ahead is enabled, which allows the controller to dynamically calculate the

optimum read-ahead size for the current workload.

• Stripe: Read-ahead is set to one stripe. The controllers treat NRAID and RAID-1 disk groups internally

as if they have a stripe size of 512 KB, even though they are not striped.

• 512 KB, 1 MB, 2 MB, 4 MB, 8 MB, 16 MB, or 32 MB: Size selected by a user.

Examples Show the cache parameters for the system and for volume V1.

# show cache-parameters V1

Basetypes

cache-settings

cache-parameter

status