HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 - (English) Advanc - Page 244
How are disk modules in the array identified?, Channel number, SCSI ID
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Selecting disks in the incorrect order of 1:2, 2:2, 1:3, and 2:3 results in mirrored pairs of 1:2/1:3 and 2:2/2:3. This puts the primary disk and mirror disk of each pair in the same enclosure, making the LUN vulnerable to an enclosure failure. Correct Disk Selection Order Pair 1 Pair 2 1:2 1:3 Primary and mirror disks on separate 2:2 channels. 2:3 Incorrect Disk Selection Order 1:2 Pair 1 2:2 Primary and mirror disks on the same 1:3 channel. 2:3 Pair 2 Figure 85 Disk Selection for a RAID 0/1 LUN How are disk modules in the array identified? When performing tasks such as binding LUNs , disk modules are identified by a numbered pair of the form "channel number:SCSI ID". For example, 1:3 identifies the disk module on channel 1 with a SCSI ID of 3. Status information may also include the enclosure number and slot number. • Channel number indicates the SCSI channel that the disk enclosure containing the disk module is connected to. There are six channels available (1 - 6). If the disk enclosure is using full-bus configuration, all disk modules within the enclosure will be on the same SCSI channel. If the disk enclosure is configured for split-bus operation, disks in the even-numbered slots will be on one channel, and disks in the odd-numbered slots will be on a different channel. • SCSI ID identifies the ID assigned to the disk module. SCSI ID's are determined by the slot in which the disk module is installed in the disk enclosure. If the disk enclosure is using full-bus configuration, the even-numbered slots are assigned SCSI IDs 0 - 4, and the odd-numbered slots are assigned IDs 8 - 12. (The gap in addresses is necessary for 244 Managing Disk Array Capacity