Reliability; Recovery Rom; Cache Error Checking And Correction (Ecc); Thermal Monitoring - HPE Smart Array P824i-p MR Gen10 User Manual

Reliability

Recovery ROM

HPE Smart Array controllers store a redundant copy of the controller firmware image to protect against
data corruption. If the active firmware image becomes corrupt, HPE Smart Array controllers use the
redundant firmware image and continue operating. The recovery ROM provides protection against power
outages during firmware flashing.

Cache Error Checking and Correction (ECC)

Error checking and correction (ECC) DRAM technology protects the data while it is in cache. The ECC
scheme generates 8 bits of check data for every 64 bits of regular data transferred. The Smart Array
memory controller uses this information to detect and correct data errors originating inside the DRAM chip
or across the memory bus.

Thermal monitoring

Smart Array monitors the temperature of each drive in the server. iLO periodically collects these drive
temperatures from Smart Array to control the fan speed. The fan speed is optimized so that each drive is
maintained below its maximum continuous operating temperature regardless of the workload.
This method has the benefit of saving cost by allowing the fans to run at an optimal setting while ensuring
that drives do not overheat.

Performance

SAS storage link speed

The Manage SAS Storage Link Speed feature allows you to change the link speed between the controller
and an expander or between the controller and a drive that is directly connected to the controller. All phys
(physical links) in a SAS port can have different link speeds or can have the same link speed.
If phys in a SAS port have different link speed settings and if a phy is connected to a drive or an
expander, the firmware overrides the link speed setting you have selected and instead uses the common
maximum link speed among all the phys.
The default setting for all phys is Max, and options include 3 GB/s, 6 GB/s, and 12 GB/s.

HPE Smart Array MR FastPath

The HPE Smart Array MR FastPath feature is an intelligent I/O passthrough mechanism for Solid State
Drive (SSD) arrays. This advanced software is an optimized version of controller technology that can
dramatically boost storage subsystem and overall application performance, especially for applications that
demonstrate high random read/write operation workloads.
FastPath is enabled for a logical drive when the logical drive is created with properties Direct IO, Write
Through, and No Read Ahead.
The logical drive must be in an optimal state for FastPath to be enabled.
FastPath allows the following IO scenarios:
• Read IOs to all RAID levels when IO size is less than or equal to the strip size.
• Write IOs to RAID 0 when IO size is less than or equal to the strip size.
• All IOs targeted to a single drive RAID 0.
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