You are here: silicon.com > Resources > White Papers > Storage > Storage Hardware > RAID

RAID White Papers

VC-RAID: A Large Virtual NVRAM Cache for Software Do-It-Yourself RAID

Tags:
raid,
log,
disk,
cache

Overview This paper presents the design, implementation and measured performance of VCRAID, a technique for overcoming the small write problem in RAID5. The approach is to use a combination of a small portion of the system RAM and a log disk to form a hierarchical cache. The log disk can be either a dedicated physical disk or several partitions of disks in the RAID. Since the log disk quickly absorbs write data from the small RAM, this hierarchical cache appears to the host as a large nonvolatile RAM. A prototype VC-RAID implemented under the Linux kernel has been tested for an extended period of time to show that it functions properly.

Further White Paper Details
Publisher	University of Rhode Island	File Format	PDF
Date Published	March 2002
Format	White Papers
Topics	RAID, Removable Storage, Virtualization

Did you find this white paper useful?

Torvalds' chip venture sets sail

The first of two chips runs at 400MHz, has 100KB of cache RAM, and is fully x86 compatible. The second, which is built for higher-end laptops runs at 700MHz and stores 400KB of on-chip cache. Three-quarters of the chip's functions will be carried...

Channel:
PDAs

Windows 2000 Special: Roll-out! Roll-out! The greatest OS on earth?

The implementation process also takes time and won't be cheap, and system requirements such as RAM, processors and hard drives might need to be upgraded. It supports the Kerberos protocol that sends encrypted passwords over a network instead of...

Channel:
Comment & Analysis

The Bloor Perspective: EMC's top spot scrutinised, UK Even-More-Online, revenge of the helpdeskers

It is blindingly obvious to just about everybody that storage management is no longer an issue about disk space or RAID or HSM controllers attached to a system. Even a SAN doesn't get all of its capabilities just by plugging a shed load of disks...

Channel:
Comment & Analysis

Windows XP: Five reasons to be cheerful

Provided there's enough RAM (double the stated 128Mb, as usual) it really is seamless. The facility to seamlessly switch users (available in Unix for years) will help support people quickly log in and out without the user being able to prove that...

Channel:
Comment & Analysis

Tiny hard drive is made for gadgets

The drive, for instance, doesn't have its own internal, dedicated pool of memory; instead, it uses the memory shared by the rest of the device to cache data. Texas Instruments manufactures silicon for the SE, while the platters are made by Hoya...

Peter Cochrane's Uncommon Sense: A sea of bits

My guess is that by 2015 we will also be using around 10GB of RAM. I drew gasps from the class when I told them: "When I was just two years older than you I was purchasing Winchester Disk Drives at $20,000 for 20MB - and they were about the size of...

Live Webcast: Telecoms 2.0 - Where is telecoms heading?

In this webcast, our panel of experts will review where we are with next generation telecoms in the UK, working through the concept of 'Telecoms 2.0': - Realising the potential of Next Generation Networks - why it isn't just about the technology? - What attributes should firms be looking for in their telco partner? - Is the relationship between telco provider and customer changing? - What things need to happen to make next generation services a reality? - You say you want the supplier to change. Do you want to change too? - What is Telecoms 2.0?

Publisher:
ZDNet UK

Telecom 2.0: Mind over matter

ntl:Telewest Business believes that the role of the telco is evolving. Gone are the days when it was enough to simply focus on circuits and minutes, customers now need a far higher degree of interaction and look for suppliers who will talk business solutions with them.

Publisher:
ntl:Telewest Business

IBM Information Server Change Data Capture

In today's fast-paced world, access to real-time data has never been more important. To be successful, organizations need to be able to report and analyze corporate data quickly and easily, regardless of what applications created the data, what platform they're running on, or what database they're stored in.

Publisher:
IBM

An examination of server consolidation: the trends that can drive efficiencies and help businesses gain a competitive edge

This white paper provides a starting point for organizations contemplating server consolidation. It includes an overview of server consolidation concepts and techniques and provides guidance on methodologies. It also looks at the potential cost savings associated with server consolidation and offers information on how organizations can sustain the advantage they have gained by consolidating their servers.

Publisher:
IBM

Also on silicon.com

Site Navigation:

RAID White Papers

VC-RAID: A Large Virtual NVRAM Cache for Software Do-It-Yourself RAID

Quick Sitemap Links:

About Us

Search

Blogs

Verticals

Advertising Features

CNET Networks in Europe

CNET Networks in the United States

CNET Networks in Asia Pacific