Raid 50; Raid 1N - American Megatrends StorTrends 1100-P User Manual

RAID 50

RAID 50 provides the features of both RAID 0 and RAID 5. RAID 50 includes both
parity and disk striping across multiple drives. RAID 50 is best implemented on two
RAID 5 disk arrays with data striped across both disk arrays. RAID 50 breaks up data
into smaller blocks, and then stripes the blocks of data to each RAID 5 raid set. RAID 5
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 array. The size of
each block is determined by the stripe size parameter, which is set during the creation of
the RAID set.
RAID 50 can sustain one to four drive failures while maintaining data integrity if each
failed disk is in a different RAID 5 array.
Point Description
uses RAID 50 works best when used with data that requires high reliability, high request rates, and
high data transfer and medium to large capacity.
strong points RAID 50 provides high data throughput, data redundancy, and very good performance.
weak points Requires 2 to 4 times as many parity drives as RAID 5.
hard disk drives Six to 32.
Note:
Supported on the StorTrends® 3100 Storage Appliance only. This is also the default
RAID level for the OS array.

RAID 1n

"RAID n" arrays are arrays that support multiple redundancies. RAID 1n supports a
minimum of three disks and supports a maximum of 16 disks.
RAID 1n, or n-way mirroring; mirrors the data stored in one hard disk drive to several
hard disk drives. This array type provides superior data redundancy because there are
three or more copies of the data. It is also useful for creating exact copies of an array for
backup purposes. However, this array type is expensive, in both performance and the
amount of disk space required to create an array type.
Point Description
uses Use RAID 1n for small databases or any other environment that requires the best fault tolerance
level but small capacity.
strong points RAID 1n provides complete data redundancy. RAID 1n is ideal for any application that requires
very strong fault tolerance and minimal capacity. RAID 1n and RAID 10n are great ways to
make backup copies of RAID 1 and RAID 10 arrays. For example, you can Transform the array
into an n array and then Split the array off and hide the Split array from the OS.
weak points RAID 1n requires at least three times as many hard disk drives. Performance is impaired during
hard disk drive rebuilds.
hard disk drives Three to 16 hard disk drives.
Note: Supported on the StorTrends® 3100 Storage Appliance only.
Appendix A : RAID 89