Introduction to Shared PERC
High-level Shared PERC 8 specifications
Shared PERC features
The Shared PERC 8 cards are available in the following form factors:
The Shared PERC 8 Internal and External cards are two separate SAS domains. The PowerEdge VRTX system is available in the following configurations for both internal and external cards:
Single Non-Fault Shared PERC 8 Card Configuration: In this configuration, the controllers do not mirror their cache. The default cache policy for virtual disks created in this configuration is write-back. In this mode, the write completion information is returned to the host after the data is written to the Shared PERC 8 controller’s cache.
Dual Fault Tolerant Shared PERC 8 Card Configuration: In this configuration, there are two Shared PERC 8 cards configured in an active-passive cluster. Both controllers can access the same storage subsystem. However, only the active controller provides the data access. If one of the Shared PERC 8 cards fails, the other Shared PERC 8 card takes control in a seamless transition. The default cache policy for virtual disks created in this configuration is write-back.
NOTE: For Shared PERC 8 External controllers, the Fault Tolerance option must be set by the user and the required cabling topology must be used.
Dual Non-Fault Tolerant Shared PERC 8 External Cards Configuration: In this configuration, the PowerEdge VRTX system contains two Shared PERC 8 External cards where both are cabled to separate JBODs creating separate SAS domains. If one Shared PERC 8 External card fails, access to the storage 8 subsystem attached to that card is lost. This configuration option is not available for Shared PERC 8 Internal cards. However, migration of disks from Shared PERC 8 internal to external cards is possible as long as they have the same firmware.
Note: This configuration is only available for external cards.
The Shared PERC 8 Internal card controls the internal storage enclosure on the VRTX chassis.
Dell-qualified SAS hard drives and SAS solid-state drives (SSDs). Mixing disks of different speeds (7,200 rpm, 10,000 rpm, or 15,000 rpm) and bandwidth (6 Gbps or higher) while maintaining the same drive type (SAS) and technology (HDD or SSD) is supported. However, this may affect data transfer performance
0, 1, 5, 6, 10, 50, and 60
NOTE: Non-RAID drives are not supported.
Four virtual functions to support up to four host servers
Dell Chassis Management Controller (CMC). NOTE: Option ROM (OP-ROM) is not supported. Booting from a shared storage is not supported. You can only boot from the storage on the server module.
Enclosure per external domain
Dell Adapter SAS RAID-on-Chip, 8 Port with LSI 2208 chipset
Battery backup unit
1 GB DDR3, 1333 MHz
Write Back, Forced Write-Back, Write Through, Adaptive ReadAhead, No Read-Ahead, and Read Ahead
Maximum number of spans per disk group
Maximum number of virtual disks per disk group
Maximum number of virtual disks
Hardware XOR engine
PCIe hot plug of controller
PCIe Hot Add only supported with Shared PERC 8 External card
Required for systems with Fault Tolerant Shared PERC 8 card configuration.
Available only for systems with Fault Tolerant Shared PERC 8 card configuration.
The Dell PowerEdge RAID Controller (PERC) line of storage controllers offers the following high level features: