Creating logical devices > advanced settings
Note: Not all options
are available for all RAID levels.
Use the Advanced settings in the Configuration wizard to tune
your logical device configuration for optimal performance. You can set the following
options:
- Write cache - Determines how data is stored in the controller's
cache memory. You can choose from two available settings: write-through
and write-back.
- stripe size - Determines the amount of data, in kilobytes
(KB), written to one segment of a logical device
before the next segment is used for subsequent data. Depending on the controller, you can choose a stripe size from 16 KB to 1024 KB.
Notes:
- The default stripe size usually provides the best performance for typical applications.
-
To change the stripe size of an existing logical device, you must expand or migrate the logical device.
- For RAID Level-6 and Level-60 logical devices,
the number of choices for stripe size decreases as the number of disks in the logical device increases.
- Read cache - Enables and disables read caching. When read-caching
is enabled, the controller monitors read access to the logical device. If it
detects a pattern, it pre-loads the cache with the data that seems most likely
to be read next. The default is Enabled.
- Initialize method - Determines the method used to initialize
the logical device. You can choose from three available methods:
- Build - For RAID Level-1 logical devices,
copies the data from the primary drive to the mirror drive. For RAID Level-5
logical devices, computes and writes the correct parity for the entire
logical device.
Note: Build
can be a lengthy operation. The Adaptec Storage Manager performs this task in
the background. However, you cannot use the logical device until the task
is complete.
- Clear - removes pre-existing data by overwriting every
block in the logical device. This method is faster than build
but the logical device is not available immediately.
For HostRAID
controllers, the Adaptec Storage Manager supports the Clear initialization method
only.
- Quick - makes the logical device available immediately.
It is the fastest method but should be used only for new physical
disks.
- Initialize priority - Adjusts the priority of the initialization
task. The default is High: initialize the logical device as fast as possible.
When you are ready to continue, click Next. The "Configuration
summary" window opens.
More information
x-0754-ASM-00-16-EN