SAS subsystem overview
Learn about the features and locations of the SAS subsystem parts in an 8408-44E or 8408-E8E system.
Use this information in conjunction with your specific system and operating system documentation.
Feature locations for the SAS subsystem parts in the Dual RAID Controllers with Write Cache configuration
Use Table 1 with Figure 1 for a list of parts and their locations.
| Diagram location | Part name | Feature code (FC) | Customer card identification numbers (CCINs) | Physical location codes |
|---|---|---|---|---|
| A | PCIe3 x8 Cache SAS RAID internal adapter 6 Gb (quantity 2) | EPVN | 2CCA |
P3 (Two controllers in P3-R1 and P3-R2) |
| B, C | Disk drive backplane with 8 SFF bays and four 1.8" SDD bays | 2CCB |
P4 |
|
| D | One Slimline DVD bay |
P4-D1 (controlled by P3-R1) |
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Note: Both P3-R1 and P3-R2 controllers can access drives D2 - D13
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Feature locations for the SAS subsystem parts in the Dual RAID Controllers without Write Cache configuration
Use Table 2 with Figure 2 for a list of parts and their locations.
| Diagram location | Part name | Feature code (FC) | Customer card identification numbers (CCINs) | Physical location codes |
|---|---|---|---|---|
| A | PCIe3 x8 SAS RAID internal adapter 6 Gb (quantity 2) | EPVP | 2CD2 |
P3 (Two controllers in P3-R1 and P3-R2) |
| B, C | Disk drive backplane with 8 SFF bays and four 1.8" SDD bays | 2CCB |
P4 |
|
| D | One Slimline DVD bay |
P4-D1 (controlled by P3-R1) |
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Note: Both P3-R1 and P3-R2 controllers can access drives D2 - D13
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Feature locations for the SAS subsystem parts in the Split Storage Backplane with Two RAID Controllers without Write Cache configuration
Use Table 3 with Figure 3 for a list of parts and their locations.
| Diagram location | Part name | Feature code (FC) | Customer card identification numbers (CCINs) | Physical location codes |
|---|---|---|---|---|
| A | PCIe3 x8 SAS RAID internal adapter 6 Gb (quantity 2) | EPVQ | 2CCD | P3 (Two controllers in P3-R1 and P3-R2) |
| B, C1, C2 | Disk drive backplane with 8 SFF bays and four 1.8" SDD bays | 2CCB |
P4 |
|
| D | One Slimline DVD bay |
P4-D1 (controlled by P3-R1) |
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Note:
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- SAS RAID adapters
- The SAS RAID adapters have the following features:
- PCI Express 3 (PCIe3) system interface
- Physical link (phy) speed of 6 Gbps SAS
- Optimized for SAS disk configurations that use dual paths through dual expanders for redundancy and reliability
- Adapter managed path redundancy and path switching for multiported SAS devices
- Embedded PowerPC processor, hardware XOR DMA Engine, and hardware Finite Field Multiplier (FFM) DMA Engine (for Redundant Array of Independent Disks (RAID))
- Support for RAID 0, 5, 5T2, 6, 6T2, 10, and 10T2 disk arrays
- Additional features when the PCIe3 x8 cache SAS RAID internal adapter 6 Gb card is installed:
- Adapters support nonvolatile write cache
- Adapters configured in dual storage IOA or high availability (HA) RAID mode for best reliability and availability
- RAID disk arrays supported as a boot device
- Advanced RAID features:
- Hot spares for RAID 5, 6, 10, 5T2, 6T2, and 10T2 disk arrays
- Background parity checking
- Background data scrubbing
- Disks formatted to 528 bytes per sector, providing cyclical redundancy checking (CRC) and logically bad block checking (T10 Data Integrity Fields)
- Optimized hardware for RAID 5 and 6 sequential write workloads
- Optimized skip read/write disk support for transaction workloads
