Comparing Raid Levels; Understanding Drive Segments - Adaptec CDP-00278-02-A User Manual

Comparing RAID Levels

Use this table to select the RAID levels that are most appropriate for the logical drives on your storage
space, based on the number of available disk drives and your requirements for performance and reliability.
RAID Level Redundancy
RAID 0 No
RAID 1 Yes
RAID 1E Yes
RAID 10 Yes
RAID 5 Yes
RAID 5EE Yes
RAID 50 Yes
RAID 6 Yes
RAID 60 Yes
Disk drive usage, read performance, and write performance depend on the number of drives in the
logical drive. In general, the more drives, the better the performance.

Understanding Drive Segments

A drive segment is a disk drive or portion of a disk drive that is used to create a logical drive. A disk drive
can include both RAID segments (segments that are part of a logical drive) and available segments. Each
segment can be part of only one logical drive at a time. If a disk drive is not part of any logical drive, the
entire disk is an available segment.
Proprietary and Confidential to PMC-Sierra, Inc.
Document No.: CDP-00278-02-A Rev. A, Issue:
Disk Drive Read
Performance
Usage
100% ***
50% **
50% **
50% **
67 – 94% ***
50 – 88% ***
67 – 94% ***
50 – 88% **
50 – 88% **
maxView Storage Manager User's Guide
Write Built-in Hot
Performance Spare
*** No
** No
** No
** No
* No
* Yes
* No
* No
* No
Minimum
Disk Drives
2
2
3
4
3
4
6
4
8
115