DataDirect Networks EF2800, User Manual

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C r e a t i n g a n d M a n a g i n g A r r a y s & P a r t i t i o n s
DataDirect Networks EF2800 FC RAID Storage System User Guide (V 1.0)
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D.3.7 Enabling or Disabling Write-back Cache
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.
To enable or disable write-back cache:
1.
Bring up the Partition menu.
From the Array Menu:
- From the System Menu, select
Array Menu
and press <Enter>.
The Select Array screen displays with a list of existing arrays.
- Select the array you want and press <Enter>. The array menu
displays.
- Select
Partition Menu
and press <Enter>. The Select Partition
screen displays with a list of existing partitions for the current
array.
- Select the partition you want and press <Enter>. The Partition
menu displays
(Figure 130)
.