Chapter 4. IBM System Storage DS planning and configuration 249
4.10.6 Cache parameters
The Storage Manager utility enables various cache settings to be configured:
Specify the DS5000 system wide settings:
– Start and stop cache flushing levels (this setting will affect all arrays and logical drives
created on the system)
– Cache Block size
Specify settings per logical drive:
– Read caching
– Cache read-ahead multiplier
– Write caching or write-through mode (write caching disabled)
– Enable or disable write cache mirroring
Figure 4-112 shows the typical values when using the Create Logical Drive Wizard. With the
Storage Manager, cache settings can be specified for each logical drive independently, giving
greater flexibility.
Figure 4-112 Default values used by the Create Logical Drive Wizard
Changing cache settings
This can be achieved at logical drive and subsystem levels.
Note: We recommend that the values are manually set during creation to suit the
performance needs of the logical drive. These settings can be changed after logical drive
creation for tuning purposes.
To Next Page
Loading...
Need help?
General