Dell PowerEdge RAID Controller 12 User’s Guide PERC H965i Adapter, PERC H965i Front, PERC H965i MX, and PERC H965e Adapter

PDF

Hardware Accelerated I/O

The PERC12 provides improved hardware accelerated I/O when compared to the previous generation of controllers. The following table lists the different types of I/O provided by PERC 12 and previous generation of storage controllers:

Table 1. Comparison of performance for different I/O type for PERC 12 and previous generation of controllersComparison of performance for different I/O type for PERC 12 and previous generation of controllers
I/O Type	VD Cache	Hardware Accelerated in previous generations	Hardware Accelerated in PERC12 generation
SAS/SATA non-RAID Read-Write	N/A	Yes	Yes
NVMe non-RAID Read Write	N/A	Yes	Yes
Any RAID Level Single-Strip-Read	Write-Through	Yes	Yes
R0, R1, R10 Single-Strip-Write	Write-Through	Yes	Yes
R0, R1, R10 Single-Strip-Read	Write-Back with cache miss	Yes	Yes
R0, R1, R10 Single-Strip-Write	Write-Back with cache miss	Yes	Yes
R5, R6 Single-Strip-Read	Write-Back with cache miss	Yes	Yes
Any RAID Level MultiStrip-Read	Write-Through	No	Yes
Any RAID Level MultiStrip-Read	Write-Back	No	Yes
R0, R1, R10 MultiStrip-Write	Write-Through	No	Yes
R0, R1, R10 Single-Strip-Read	Write-Back with cache hit	No	Yes
R0, R1, R10 Single-Strip-Write	Write-Back with cache hit	No	Yes
R5, R6 Write	Write-Through	No	Yes
R5, R6 Write	Write-Back	No	Yes
R5, R6 Single-Strip-Read	Write-Back with cache hit	No	Yes
Cache Flush	Write-Back	No	Yes
Degraded VD-Read	Write-Through and Write-Back	No	Yes