Lenovo ThinkServer TS430 User Manual

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MegaRAID SAS Software User Guide Chapter 2: Introduction to RAID
| RAID Levels
Figure 11: RAID 00 Drive Group Example with Two Drives
2.5.8 RAID 10 RAID 10 is a combination of RAID 0 and RAID 1, and consists of stripes across mirrored
drives. RAID 10 breaks up data into smaller blocks and then mirrors the blocks of data
to each RAID 1 drive group. The first RAID 1 drive in each drive group then duplicates its
data to the second drive. The size of each block is determined by the stripe size
parameter, which is set during the creation of the RAID set. The RAID 1 virtual drives
must have the same stripe size.
Spanning is used because one virtual drive is defined across more than one drive
group. Virtual drives defined across multiple RAID 1 level drive groups are referred to as
RAID level 10, (1+0). Data is striped across drive groups to increase performance by
enabling access to multiple drive groups simultaneously.
Each spanned RAID 10 virtual drive can tolerate multiple drive failures, as long as each
failure is in a separate drive group. If there are drive failures, less than total drive
capacity is available.
Configure RAID 10 by spanning two contiguous RAID 1 virtual drives, up to the
maximum number of supported devices for the controller. RAID 10 supports a
maximum of eight spans, with a maximum of 32 drives per span. You must use an even
number of drives in each RAID 10 virtual drive in the span.
NOTE: Other factors, such as the type of controller, can restrict the number of drives
supported by RAID 10 virtual drives.
Table12 provides an overview of RAID 10.
Segment 1
Segment 2 Segment 3
Segment 6
Segment 8
Segment 5
Segment 7
Segment 9
Segment 11
Segment 13
Segment 15
Segment 10
Segment 12
Segment 14
Segment 16
Segment 4
...
...
...
...
RAID
0
RAID 0
RAID 0
RAID 0
RAID 00
RAID 0
Segment 17
Segment 18 Segment 19
Segment 20 Segment 21
Segment 22 Segment 23
Segment 24
Table 12: RAID 10 Overview
Uses Appropriate when used with data storage that needs 100 percent
redundancy of mirrored drive groups and that also needs the enhanced I/O
performance of RAID 0 (striped drive groups.) 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 Provides both high data transfer rates and complete data redundancy.
Weak Points Requires twice as many drives as all other RAID levels except RAID 1.
Drives 4 - The maximum number of drives supported by the controller (using an
even number of drives in each RAID 10 virtual drive in the span)

Lenovo ThinkServer TS430 Specifications

General

Brand	Lenovo
Model	ThinkServer TS430
Category	Server
Language	English