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Technical white paper | HP RA for Red Hat Storage Server on HP ProLiant SL4540 Gen8 Server

• Unified global namespace. Red Hat Storage Server aggregates disk and memory resources into a single common pool.

This flexible approach simplifies management of the storage environment and eliminates data silos. Global namespaces

may be grown and shrunk dynamically, with no interruption to client access.

• Rapid and random access. Unlike archival systems based on tape, Red Hat Storage Server offers fast random access, and

data can be both accessed and recovered rapidly.

From a technical perspective, Red Hat Storage Server provides distinct advantages over other technologies.

• Software-defined storage. Red Hat believes that storage is a software problem that cannot be solved by locking

organizations into a particular storage hardware vendor or a particular hardware configuration. Instead, Red Hat Storage

Server is designed to work with a wide variety of industry-standard storage, networking, and compute server solutions.

• Open source. Red Hat believes that the best way to deliver functionality is by embracing the open source model. As a

result, Red Hat Storage Server users benefit from a worldwide community of thousands of developers who are

constantly testing the product in a wide range of environments and workloads, providing continuous feedback, and

providing unbiased feedback to other users.

• Complete storage operating system stack. Red Hat Storage Server delivers more than just a distributed file system. The

complete storage solution adds distributed memory management, I/O scheduling, software RAID, self-healing, local N-

way synchronous replication, and asynchronous long-distance replication via Red Hat Geo-Replication.

• User space. Unlike traditional file systems, Red Hat Storage Server operates in user space, rather than kernel space. This

innovation makes installing and upgrading Red Hat Storage Server significantly easier, and greatly simplifies

development efforts since specialized kernel experience is not required.

• Modular, stackable architecture. Red Hat Storage Server is designed using a modular and stackable architecture

approach. Configuring Red Hat Storage Server for highly-specialized environments is a simple matter of including or

excluding particular modules.

• Data stored in native formats. With Red Hat Storage Server, data is stored on disk using native formats (i.e., XFS) with

various self-healing processes established for data. As a result, the system is extremely resilient and files are naturally

readable without Red Hat Storage Server.

• No metadata with the elastic hash algorithm. Unlike other storage systems with a distributed file system, Red Hat

Storage Server does not create, store, or use a separate index of metadata in any way. Instead, Red Hat Storage Server

places and locates files algorithmically. The performance, availability, and stability advantages of not using metadata are

significant, and in some cases, dramatic.

Two-node HP ProLiant SL4540 Gen8 server

The HP ProLiant SL4500 Gen8 server is the industry’s first ever purpose-built server for big data. With support for up to 540

drives and over 2PB per rack, these servers are ideal for building dense scale-out storage infrastructure. At the same time,

the server features a converged and balanced architecture that is ideal for a range of workloads, with an efficient chassis

that scales easily as data grows. The server is designed with workload optimization in mind, with different ratios of compute

and storage capacity per server, and with scalable performance and throughput demanded by those workloads.

• The one-node chassis supports up to 60 disk drives.

• The two-node chassis supports up to 25 disk drives per node (up to 50 drives per chassis).

• The three-node chassis supports up to 15 disk drives per node (up to 45 drives per chassis).

The HP and Red Hat scale-out storage solution and use cases described in this document are based on the two-node HP

ProLiant SL4540 Gen8 server. However, depending on application needs, Red Hat Storage Server can be run on one-, two-,

and three-node HP ProLiant SL4540 Gen8 servers as described below in the section on capacity and sizing. Importantly,

each node within the two-node and three-node chassis is electrically isolated. Power and cooling are shared, reducing both

CAPEX and OPEX required for the entire system. HP ProLiant SL4540 Gen8 servers can be configured to order.

For all of the HP ProLiant SL4540 Gen8 servers, each compute node is further divided into three zones to provide

serviceability and balanced performance:

• Compute node module. The compute module includes two processor sockets and 12 DIMM slots. One or two Intel

E5-2400 or E5-2400 v2 series processors can be configured. Two 2.5-inch small form factor (SFF) hot pluggable SATA

drive slots provide redundant boot and operating system space, allowing all of the large form factor (LFF) drives to be

used for data storage.

• I/O module. The I/O module includes an HP Smart Array P420i controller and an optional low-profile PCI Express slot.

Dual Gigabit Ethernet connections are provided and an optional dual-port 10 Gigabit Ethernet NIC is supported

(upgradable to a single 40Gb InfiniBand port).

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