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MaxAttach NAS 6000 Administration Guide
Volume Set
A volume set is an additional storage type, not included in the RAID specifications but
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supported by Windows NT is a VOLUME SET.
A volume set simply allows the logical drive to be extended to an additional physical
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drive.
It offers no additional performance or fault tolerance and is in fact quite dangerous since
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the failure of one of the members of the volume will destroy the entire volume.
Logical (System) Drives
After all physical drive groups are defined and arranged, one or more logical drives must be
created. Logical drives are the drives presented to the operating system.
A logical drive's capacity may encompass any portion of a drive group (up to the total
capacity of that Drive Group), or the capacity of more than one drive group. Up to 8
(below PCI firmware version 2.6, and all External Controller firmware) or 32 (PCI
firmware version 2.6 and above) logical drives may be created. The following illustration
shows a RAID 0+1 configuration with three mirrored logical drives created in a drive
group containing three disk drives.
System Drives
Each System Drive has a defined RAID Level (0, 1, 5, 0+1, etc.) based on the number of
drives in the Drive Group from which it is created. If a Drive Group has enough drives to
support several different RAID levels, the System Drive can be assigned any available
levels. However, a System Drive may have only one RAID level.
Chapter #11 - Appendix - Disk Array RAID Concepts
11/07/01 -- Revision 2.0.03A
Chapter #11 - Appendix - Disk Array RAID Concepts
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Comparison of Terms
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