Adaptec 5325301638 Administration Guide - Page 52
Status Devices, The Disk Drive Detail Screen
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Status Devices On the Storage > Devices screen, an expansion array's disk drives are distinguished from those of the host server by the label EXTN. The following graphic shows the Devices screen of a host Snap Server 4500. The disk drives of the expansion array connected to Port 1 of the host server's Serial ATA card display with the label EXTN1; the disk drives of a second expansion array connected to Port 2 display with the label EXTN2. With multiple Snap Disk 30SAs or Snap Disk 32SAs, the disk drives are numbered in the order in which they are daisy chained. The disk drives of an expansion array are completely integrated into the host Snap Server's logic. The default configurations are preconfigured as separate RAIDs, but you can delete these configurations and recombine the internal and external disk drives as necessary. For example, to create one large RAID, you could delete the existing RAIDs on both the host server and the expansion arrays, and then recombine all drives into one high-capacity storage system. This configuration reduces administrative complexity and overhead, but because the failure of any one unit in the system (due to a cable coming loose, for example) will render the entire RAID inaccessible. Caution (1) Host server disk drives and expansion array disk drives are logically interchangeable, 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 or 5. 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 116 MB disk drive and three 237 MB disk drives, the RAID can use only 116 MB on each disk drive. In this case, the total RAID capacity is approximately 464 MB (4 x 116) rather than the expected 827 MB (116 + [3 x 237]). Status Devices To view the status of the disk drives installed on the server, navigate to the Storage > Devices screen. If the system consists of a single Snap Server, a Disk Drive Detail screen displays. If the system consists of a Snap Server 4500 or 15000 and one or more expansion arrays, an enclosure summary screen displays, with links to the Disk Drive Detail screen for each enclosure. The Disk Drive Detail Screen If the system consists of a single Snap Server, a Disk Drive Detail screen displays. Understanding the Disk Drive Detail table The table displays the location, model, actual capacity, and status of each drive. 38 Snap Server Administrator Guide
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