Users Guide

• RAID Level 10 (Striping Over Mirror Sets)
• Comparing RAID Level And Concatenation Performance
• No-RAID
Concatenation
In Storage Management, concatenation refers to storing data on either one physical disk or on disk space that spans multiple physical
disks. When spanning more than one disk, concatenation enables the operating system to view multiple physical disks as a single disk. Data
stored on a single disk can be considered a simple volume. This disk could also be defined as a virtual disk that comprises only a single
physical disk.
Data that spans more than one physical disk can be considered a spanned volume. Multiple concatenated disks can also be defined as a
virtual disk that comprises more than one physical disk.
A dynamic volume that spans to separate areas of the same disk is also considered concatenated.
When a physical disk in a concatenated or spanned volume fails, the entire volume becomes unavailable. Because the data is not
redundant, it cannot be restored by rebuilding from a mirrored disk or parity information. Restoring from a backup is the only option.
Because concatenated volumes do not use disk space to maintain redundant data, they are more cost-efficient than volumes that use
mirrors or parity information. A concatenated volume may be a good choice for data that is temporary, easily reproduced, or that does not
justify the cost of data redundancy. In addition, a concatenated volume can easily be expanded by adding an additional physical disk.
• Concatenates n disks as one large virtual disk with a capacity of n disks.
• Data fills up the first disk before it is written to the second disk.
• No redundant data is stored. When a disk fails, the large virtual disk fails.
• No performance gain.
• No redundancy.
RAID level 0 - striping
RAID 0 uses data striping, which is writing data in equal-sized segments across the physical disks. RAID 0 does not provide data
redundancy.
Understanding RAID concepts
19