Raid 5; Raid 10 - American Megatrends StorTrends 1100-P User Manual

RAID 5

RAID 5 includes disk striping at the byte level and parity. In RAID 5, the parity
information is written to several hard disk drives. RAID 5 is best suited for networks that
perform a lot of small I/O transactions simultaneously.
RAID 5 addresses the bottleneck issue for random I/O operations. Since each hard disk
drive contains both data and parity numerous writes can take place concurrently. In
addition, robust caching algorithms and hardware based exclusive-or assist make RAID 5
performance exceptional in many different environments.
Point Description
uses RAID 5 provides high data throughput, especially for large files. Use RAID 5 for transaction
processing applications because each hard disk drive can read and write independently. If a hard
disk drive fails, the StorTrends® iTX Software uses the parity stored on each of the other hard
disk drives to recreate all missing information. Use also for office automation and online
customer service that requires fault tolerance. Use for any application that has high read request
rates but low write request rates.
strong points Provides data redundancy and good performance in most environments
weak points Hard disk drive performance will be reduced if a hard disk drive is being rebuilt. Environments
with few processes do not perform as well because the RAID overhead is not offset by the
performance gains in handling simultaneous processes.
hard disk drives Three to 32 hard disk drives

RAID 10

RAID 10 is a combination of RAID 0 and RAID 1. RAID 10 has mirrored drives. RAID
10 breaks up data into smaller blocks, and then stripes the blocks of data to each RAID 1
raid set. Each RAID 1 raid set then duplicates its data to its other drive. The size of each
block is determined by the stripe size parameter, which is set during the creation of the
RAID set. RAID 10 can sustain one to four drive failures while maintaining data integrity
if each failed disk is in a different RAID 1 array.
Point Description
uses RAID 10 works best for data storage that must have 100% redundancy of mirrored arrays and
that also needs the enhanced I/O performance of RAID 0 (striped arrays). RAID 10 works well
for medium-sized databases or any environment that requires a higher degree of fault tolerance
and moderate to medium capacity.
strong points RAID 10 provides both high data transfer rates and complete data redundancy.
weak points RAID 10 requires twice as many drives as all other RAID levels except RAID 1.
hard disk drives 2n, where n is greater than 1.
Note:
Supported on the StorTrends® 3100 Storage Appliance only.
88 ManageTrends (version 2.6) Web Interface User's Guide