Planning of Device Layout in a Bay (Applicable to 18000F Series)
Before laying out devices in a bay or expanding your storage capacity, familiarize yourself with the layout principles.
Background Information
- To ensure performance and data security of a storage system, you are advised to divide all SAS disk enclosures into 16 expansion loops and all smart disk enclosures into 8 expansion loops. For the expansion loops and disk enclosure IDs, see 2 U SAS Disk Enclosures Only and Smart Disk Enclosures Only.
- Table 7-6 describes the meanings of the abbreviations in the figures.
Table 7-6 Port naming rules
Name
Description
Example
DAExxx
Disk enclosure number
DAE000
CTEx
Controller enclosure number
CTE0
H/Lx
Slot number of the interface module on the controller enclosure
H6
Px
Port number of the interface module on the controller enclosure
P0
- CTE represents a controller enclosure. CTE0 indicates a controller enclosure in system bay 0; CTE1 indicates a controller enclosure in system bay 1.
- DAE represents a disk enclosure. DAEXXX indicates a disk enclosure number, where:
- The first X indicates the ID of the system bay to which the disk enclosure is connected.
- The second X indicates the ID of the loop to which the disk enclosure belongs.
- The third X indicates the ID of the disk enclosure in the loop. A larger value indicates a higher cascading depth.
For details about disk enclosure naming rules, see Loop ID and Disk Enclosure ID Naming Rules.
- Figure 7-15 shows the colors that represent different cascading depths of the disk enclosure in the figures.
- Description of loop IDs:All disk enclosures in a fully loaded bay are divided into eight cascading loops. The loops are numbered from 0 to 7 from bottom to top.
- Upper half: 1 U to 16 U, that is, loop 0 to loop 3
- Lower half: 17 U to 42 U, that is, loop 4 to loop 7
2 U SAS Disk Enclosures Only
If only 2 U SAS disk enclosures are configured, a maximum of sixteen 2 U SAS disk enclosures are required for a bay in full configuration.
- If the number of 2 U SAS disk enclosures is a multiple of 16, the configuration of 2 U SAS disk enclosures and expansion ports is shown in Figure 7-16.
The green and orange areas indicate level-1 and level-2 disk enclosures respectively (that is, first and second disk enclosures in a loop). On the right of a disk enclosure ID is the port ID of the controller enclosure connecting to the disk enclosure. For example, DAE000 indicates the level-1 disk enclosure connecting to port P0 in slot 6 of controller enclosure 0, and DAE001 indicates the level-2 disk enclosure connecting to port P0 in slot 6 of controller enclosure 0.
- If the number of 2 U disk enclosures is not a multiple of 16:
- Each loop contains only one disk enclosure.
Disk bays and system bays use the same disk enclosure layout. The following uses system bay 0 as an example.
Allocate disk enclosures to loops 0 to 7 in the sequence of DAE000 > DAE010 >...> DAE0E0 > DAE0F0.
- Each loop contains up to two disk enclosures.
Install level-1 disk enclosures in the same bay and level-2 disk enclosures in the same bay. Disk bays and system bays use the same disk enclosure layout. The following uses system bay 0 and disk bay 0_0 as an example.
- Allocate level-1 disk enclosures to loops 0 to 7 in system bay 0 in the sequence of DAE000 > DAE010 >...> DAE0E0 > DAE0F0.
- Allocate level-2 disk enclosures to loops 0 to 7 in disk bay 0_0 in the sequence of DAE001 > DAE011 >...> DAE0E1 > DAE0F1.
- Each loop contains only one disk enclosure.
Smart Disk Enclosures Only
If only smart disk enclosures are configured, a maximum of eight smart disk enclosures are required for a bay in full configuration. Each smart disk enclosure occupies 4 U. For example, if DAE000 is installed in 3 U and 4 U, then keep 1 U and 2 U idle.
- If the number of smart disk enclosures is a multiple of 8, the configuration of smart disk enclosures and expansion ports is shown in Figure 7-17.
The green, orange, yellow, and pink areas indicate the level-1, level-2, level-3, and level-4 disk enclosures respectively (that is, first, second, third, and fourth disk enclosures in a loop). On the right of a disk enclosure ID is the port ID of the controller enclosure connecting to the disk enclosure. For example, DAE000 indicates the level-1 disk enclosure connecting to port P0 in slot 6 of controller enclosure 0, and DAE001 indicates the level-2 disk enclosure connecting to port P0 in slot 6 of controller enclosure 0.
- If the number of smart disk enclosures is not a multiple of 8:
- Each loop contains only one disk enclosure.
Disk bays and system bays use the same disk enclosure layout. The following uses system bay 0 as an example.
Allocate disk enclosures to loops 0 to 7 in the sequence of DAE000 > DAE010 >...> DAE060 > DAE070.
- Each loop contains up to two disk enclosures.
Install level-1 disk enclosures in the same bay and level-2 disk enclosures in the same bay. Disk bays and system bays use the same disk enclosure layout. The following uses system bay 0 and disk bay 0_0 as an example.
- Allocate level-1 disk enclosures to loops 0 to 7 in system bay 0 in the sequence of DAE000 > DAE010 >...> DAE060 > DAE070.
- Allocate level-2 disk enclosures to loops 0 to 7 in disk bay 0_0 in the sequence of DAE001 > DAE011 >...> DAE061 > DAE071.
- Each loop contains only one disk enclosure.