HP ProLiant DL380p ISS Technology Focus, Number 14
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- HP ProLiant DL380p | ISS Technology Focus, Number 14 - Page 1
Technology Focus Number 14 In this issue: » Choose the right solidstate storage solution » Efficiency of DC vs. AC power supplies » Tip: for ProLiant servers" at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01580706/c01580706.pdf. NAND flash memory Solid-state devices based on NAND - HP ProLiant DL380p | ISS Technology Focus, Number 14 - Page 2
hot plug removal), user data in write cache still writes to the drive and the drive can be ready in a short time. This allows HP SSDs to avoid the lengthy metadata rebuild process required for SSDs without power-loss protection. SmartSSD Wear Gauge support All HP SSDs incorporate sophisticated - HP ProLiant DL380p | ISS Technology Focus, Number 14 - Page 3
classes Efficiency of DC vs. AC power supplies HP offers 1200 W -48 V DC Common Slot Power Supplies with 90% efficiency for our ProLiant DL360 G7, DL380 G6 and G7, and DL385 G6 and G7 servers. We also offer selfcooled 2250 W -48 V DC power supplies with 90% efficiency specifically designed for - HP ProLiant DL380p | ISS Technology Focus, Number 14 - Page 4
from the utility to the server components, which increases efficiency. DC and AC power supplies For several years, -48 V DC power supplies were more efficient than AC power supplies. But today‟s AC power supplies, such as the HP Gold and Platinum Common Slot Power Supplies, achieve efficiencies that - HP ProLiant DL380p | ISS Technology Focus, Number 14 - Page 5
Control for Microsoft® System Center integration overview » Serial ATA Technology, 4th edition » Effects of virtualization and cloud computing on data center networks » Optimizing GPU-based application performance for the HP for the HP ProLiant SL390s G7 server » ISS Technology Communications
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ISS Technology Focus
Number 14
In this issue:
»
Choose the right solid-
state storage solution
»
Efficiency of DC vs. AC
power supplies
»
Tip: Check Hyper-
Threading status
remotely using
Microsoft® Windows®
PowerShell
»
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Choose the right solid-state storage solution
This article describes the features and applications of HP enterprise class solid-state
drives (SSDs) and IO accelerators. A subsequent article will detail the differences in these
solid-state storage devices based on performance, latency, lifetime writes, and expected
life at 100% writes. HP solid-state storage devices are based on NAND flash memory,
which is the predominant solid-state storage technology. Before describing the features
and applications of these devices, we must explain a few important characteristics of
NAND flash memory. If you are unfamiliar with NAND architecture, read the technology
brief “Solid state storage technology for ProLiant servers”
at
.
NAND flash memory
Solid-state devices based on NAND technology have a finite amount of writes and can be
„worn out‟ ove
r time. The life expectancy (endurance) of a SSD or IO accelerator is
dependent on the NAND technology, write workloads, and the capacity of the device.
There are two primary types of NAND flash technology, each with different endurance,
performance, densities, and costs.
•
Single-level cell (SLC) technology works by storing one of two different charge states in
each cell, representing a single bit of information.
•
Multi-level cell (MLC) technology stores two or more bits in one cell. This allows each cell
increase storage density by 100% or more. Two-bit MLC stores one of four different charg
states in a cell. Three-bit MLC stores one of eight different charge states in a cell.
As shown in Figure 1-1, SLC NAND has higher endurance, retention, and write
performance than MLC NAND. MLC technology is the dominant NAND technology used in
consumer products where cost is a primary factor. SLC-based SSDs provide the highest
performance and endurance for enterprise server storage. MLC-based SSDs provide a
lower cost per GB solution but have lower write performance and write endurance. MLC-
based SSDs are a good option for read-intensive application environments with limited
write requirements.