Adaptec 5325301656 Administration Guide - Page 68

physically take a disk drive from an expansion array and place it in a host Snap

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Expansion Arrays The Storage > Disks/Units screen displays the head unit and any expansion arrays attached to the head unit. For more information about the Disk/Units screen, please see "Disks and Units" on page 55. The disk drives of an expansion array are completely integrated into the host Snap Server's logic. The default RAID configurations can be deleted and the internal and external disk drives recombined as necessary. For example, to create one large RAID, you could delete the existing RAIDs on both the host server and a SANbloc S50 expansion array, then combine all drives into one high-capacity storage system. This configuration reduces administrative complexity and overhead, but the failure of any one unit in the system (due to a cable coming loose, for example) will render the entire RAID inaccessible. This configuration also increases the potential for multiple drive failures in a single RAID. See "RAID Groups" on page 45 for information on how to avoid this. Cautions (1) Host server disk drives and expansion array disk drives are logically interchangeable, but they are not physically interchangeable. That is, you cannot physically take a disk drive from an expansion array and place it in a host Snap Server. Snap Server disk drives contain GuardianOS-specific data that is lacking on expansion array disk drives. (2) Do not mix drives of different capacity in a RAID 1, 5, 6, or 10. The redundancy schemes in these RAID types limit capacity usage in all member drives to the capacity of the smallest member disk drive. For example, if a RAID consists of one 160 GB disk drive and three 250 GB disk drives, the RAID can use only 160 GB on each disk drive. In this case, the total RAID capacity is approximately 640 GB (4 x 160) rather than the expected 910 GB (160 + [3 x 250]). 54 Snap Server Administrator Guide

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Expansion Arrays
54
Snap Server Administrator Guide
The
Storage > Disks/Units
screen displays the head unit and any expansion arrays
attached to the head unit. For more information about the Disk/Units screen, please
see “Disks and Units” on page 55.
The disk drives of an expansion array are completely integrated into the host Snap
Server’s logic. The default RAID configurations can be deleted and the internal and
external disk drives recombined as necessary. For example, to create one large
RAID, you could delete the existing RAIDs on both the host server and a SANbloc
S50 expansion array, then combine all drives into one high-capacity storage system.
This configuration reduces administrative complexity and overhead, but the failure
of any one unit in the system (due to a cable coming loose, for example) will render
the entire RAID inaccessible. This configuration also increases the potential for
multiple drive failures in a single RAID. See “RAID Groups” on page 45 for
information on how to avoid this.
Cautions
(1) Host server disk drives and expansion array disk drives are logically
interchangeable, but they are not physically interchangeable. That is, you cannot
physically take a disk drive from an expansion array and place it in a host Snap
Server. Snap Server disk drives contain GuardianOS-specific data that is lacking on
expansion array disk drives. (2) Do not mix drives of different capacity in a RAID 1,
5, 6, or 10. The redundancy schemes in these RAID types limit capacity usage in all
member drives to the capacity of the smallest member disk drive. For example, if a
RAID consists of one 160 GB disk drive and three 250 GB disk drives, the RAID can
use only 160 GB on each disk drive. In this case, the total RAID capacity is
approximately 640 GB (4 x 160) rather than the expected 910 GB (160 + [3 x 250]).