User manual

Chapter 5: Concepts
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RAID 10
Recommended Applications for RAID 10
• Imaging applications
• Database servers
• General fileserver
JBOD
Recommended Applications for JBOD
• Any application requiring multiple disk drives but where read/write speed or
fault-tolerance are not important
• Applications were low-cost operation critical
Other Logical Drive Features
Stripe Block Size
The choices are 32K, 64K and 128K. 64K is the default. This selection will
directly affect performance. There are two issues to consider when selecting the
stripe block size.
• Choose a stripe block size equal to or smaller than the smallest cache buffer
found on any disk drive in your logical drive. A larger value slows the logical
drive down because disk drives with smaller cache buffers need more time
for multiple accesses to fill their buffers.
Advantages Disadvantages
Implemented as a mirrored logical drive
whose segments are RAID 0 logical
drives
High I/O rates are achieved thanks to
multiple stripe segments
Very high disk overhead - uses only
50% of total capacity
Advantages Disadvantages
Enables you to manage a large number
of disk drives from a single controller
The failure of one drive has no effect
upon the data in other disk drives
An alternative to RAID without any
RAID advantages
Should not be used in mission critical
environments