Specifications

48 en | LCD Keypad Operation SCSI to SATA RAID Subsystem | Administrator’s Manual
F.01U.027.802 | V1 | 2006.11 Bosch Security Systems
5 LCD Keypad Operation
A navigation roadmap for the configuration menu options of LCD keypad is separately avail-
able as a PDF file. You may check your Product Utility CD or visit Bosch’s Extranet site for the
latest update.
5.1 Power On the RAID Enclosure
Before you start to configure a RAID system, make sure that hardware installation is com-
pleted before any configuration takes place. Power on your RAID enclosure.
5.2 Caching Parameters
5.2.1 Optimization Modes
Mass storage applications can be divided into two major categories according to its read/
write characteristics: database and video/imaging. To optimize a subsystem for these two cat-
egories, two embedded optimization modes are available with system behaviors adjusted to
different read/write parameters. They are the Optimization for Random I/O and the Optimiza-
tion for Sequential I/O.
Limitations:
There are limitations on the use of optimization modes.
1. System default is Optimization for Sequential I/O.
2. You can select the stripe size of each array (logical drive) during the initial configuration.
However, changing stripe size is only recommended for experienced engineers who have
tested the effects of tuning stripe sizes for different applications.
3. The array stripe size can only be changed during the initial configuration process.
4. Once the controller optimization mode is applied, access to different logical drives in a
RAID system will follow the same optimized pattern.
Database and Transaction-based Applications:
These kinds of applications usually include SQL server, Oracle server, Informix, or other data-
base services. These applications keep the size of each transaction down to the minimum, so
that I/Os can be rapidly processed. Due to their transaction-based nature, these applications
do not read or write a bunch of data in sequential order - access to data occurs randomly. The
transaction size usually ranges from 2K to 4K. Transaction performance is measured in “I/Os
per second” or “IOPS.”
Video Recording/Playback and Imaging Applications:
These kinds of applications usually includes video playback, video post-production editing, or
other similar applications. These applications have the tendency to read or write large files
from and into storage in sequential order. The size of each I/O can be 128K, 256K, 512K, or up
to 1MB. The efficiency of these applications is measured in “MB/sec.”
When an array works with applications such as video or image oriented applications, the appli-
cation reads/writes from the drive as large-block, sequential threads instead of small and ran-
domly accessed files.
The controller optimization modes have read-ahead buffer and other R/W characteristics
tuned to obtain the best performance for these two major application categories.