HP Surestore Disk Array FC60 ISS Technology Focus, Number 14
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- HP Surestore Disk Array FC60 | ISS Technology Focus, Number 14 - Page 1
ISS Technology Focus Number 14 In this issue: » Choose the right solidstate storage solution » Efficiency of DC vs. AC power read the technology brief "Solid state storage technology for ProLiant servers" at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01580706/c01580706.pdf. NAND flash - HP Surestore Disk Array FC60 | ISS Technology Focus, Number 14 - Page 2
hot plug removal), user data in write cache still writes to SmartSSD Wear Gauge support All HP SSDs incorporate sophisticated storage, allowing applications to access them like other storage volumes. However, an I/O Accelerator is both a controller and storage device, with its own specialized driver - HP Surestore Disk Array FC60 | ISS Technology Focus, Number 14 - Page 3
product. Table 1-1: Enterprise solid-state storage device classes Efficiency of DC vs. AC power supplies HP offers 1200 W -48 V DC V DC power supplies with 90% efficiency specifically designed for the HP BladeSystem c7000 Enclosure. Each c7000 enclosure can contain up to six 2250 W 48 V DC power - HP Surestore Disk Array FC60 | ISS Technology Focus, Number 14 - Page 4
servicing HP Gold and Platinum Common Slot Power Supplies, achieve efficiencies that reach or exceed 90%. In particular, HP support for Hyper-Threading (HT) Technology, also known as simultaneous multi-threading. HT, which is enabled by default, allows the OS to schedule two instruction Manager. number - HP Surestore Disk Array FC60 | ISS Technology Focus, Number 14 - Page 5
papers published since our last edition of the ISS Technology Focus. » Configuring HP Integrated Lights-Out 3 with Microsoft Active Directory HOWTO, 2nd edition » Serial Attached SCSI technologies and architectures, 4th edition » HP Insight Control for Microsoft® System Center integration overview
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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
»
Recent publications
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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.