LSI Corporation
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12Gb/s MegaRAID SAS Software User Guide
March 2014
Chapter 2: Introduction to RAID
RAID Levels
Table 13 RAID 50 Overview
Figure 13 RAID 50 Level Virtual Drive
2.2.10
RAID 60
RAID 60 provides the features of both RAID 0 and RAID 6, and includes both parity and disk striping across multiple
drive groups. RAID 6 supports two independent parity blocks per stripe. A RAID 60 virtual drive can survive the loss of
two drives in each of the RAID 6 sets without losing data. RAID 60 is best implemented on two RAID 6 drive groups
with data striped across both drive groups.
RAID 60 breaks up data into smaller blocks and then stripes the blocks of data to each RAID 6 disk set. RAID 6 breaks
up data into smaller blocks, calculates parity by performing an exclusive-or on the blocks, and then writes the blocks
of data and parity to each drive in the drive group. The size of each block is determined by the stripe size parameter,
which is set during the creation of the RAID set.
RAID 60 can support up to 8 spans and tolerate up to 16 drive failures, though less than total drive capacity is
available. Two drive failures can be tolerated in each RAID 6 level drive group.
Uses
Appropriate when used with data that requires high reliability, high request rates, high data transfer, and
medium-to-large capacity.
Strong points
Provides high data throughput, data redundancy, and very good performance.
Weak points
Requires two times to eight times as many parity drives as RAID 5.
Drives
8 spans of RAID 5 drive groups containing 3 to 32 drives each (limited by the maximum number of devices
supported by the controller)
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Summary of Contents for ThinkServer RD650
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