Rorke Data The Galaxy 65, Руководство пользователя

Страница: 163 / 258

Managing Arrays & Partitions
143
3 Select Read-Ahead Size and press Enter
The Read-Ahead Size screen displays.
4 Select the amount of data you want the Storage Manager to read ahead for this partition and press Enter .
C.3.7 Enabling or Disabling Write-back Cache
Important This function is not available with the current software level (January 2003).
You can enable or disable the write-back cache for a partition. By default, partition write- back cache is
enabled. For most applications, this is the best setting.
Note This feature is intended for advanced users only. You may hinder your system’s performance if used
incorrectly.
If you are writing large chunks of sequential data (as would be done in video editing, telemetry acquisition,
or data logging), you might want to experiment with disabling the write-back cache. You may see large
performance gains if you are writing data under the following circumstances:
• Sequential writes
• Large I/Os in relation to the stripe size
• Deep queue depth
If you are doing any type of random access to this partition, leave the write-back cache enabled.