An Overview of the Storage Options of Today and Tomorrow
This year, it is estimated that 75 cents of every dollar spent on information technology will be spent on storage
Capacity at U.S. Businesses and Government agencies is growing at 60% to 100% annually
The market for disk subsystems (all platforms) will be more than $32 billion this year.
More Interesting Facts
Storage capacity in terms of RAID subsystems shipments for Unix and Windows NT should grow at a compound annual growth rate of 91%.
Factory revenues for disk drives alone will top $25 billion this year, while the market for tape drives was $3.5 billion last year, and optical devices racked up $6.9 billion in revenues.
More Interesting Facts
Revenues from storage, networking and storage management software associated with Fibre Channel storage area networks (SANs) in open environments is expected to exceed $10 billion in 2002, up from less than $1 billion in 1997.
Primarily used for content exchange, backup and archiving and not for primary storage
Large Capacity—typically 300MB to 6GB
Random Access—average seek time 27 ms
Long Life—10 to 100 years
Issues with Optical Storage
Survivability of the Optical Media outlasting the format
There are records of the Korean War that are essentially irretrievable not because the tape deteriorated, but because they’re on some weird format. How long will there be a reading device that will read today’s current optical format? Try finding a drive to read a 15-year-old 8-inch floppy.
Considerations for Choosing Optical Storage
Performance—speed of data retrieval
Cost per Megabyte
Longevity of data
What’s the Deal?
Application of Tape
Primarily used for offline storage and backup of primary storage units.
New technologies such as Virtual Tape systems will compete with Optical storage.
Benefits of Tape
Extremely high capacity per cartridge
Lowest cost per Megabyte of all storage media options
Compatible with multitudes of formats
Performance—sequential read/write format making solution too slow for primary storage
Subject to high operational stresses
Relatively short operational life of tape cartridges compared to other storage media
Subject to deterioration and environmental hazards
A rray of
High Performance and Availability
Easier to Mirror Data to remote locations
Works with a variety of platforms and operating systems
Becoming the most common data storage configuration
NAS Network Attached Storage
What is it?
NAS devices contain embedded processors that run some sort of OS or micro kernel that understands networking protocols and is optimized for particular tasks, such as file service. NAS devices usually deploy some level of RAID storage.
More on NAS
NAS Devices can easily and quickly attach to a LAN
NAS is platform and OS independent and appears to applications as another server
NAS Devices provide storage that can be addressed via standard file system (e.g., NFS, CIFS) protocols
NAS is evolving in two directions:
The first is toward very low cost entry configurations to compete with magnetic (tape) or optical drives
The second is toward implementations with a dedicated gigabit Ethernet interconnection among storage elements
Additional Benefits of NAS
Files are easily shared among users at high demand and performance
Files are easily accessible by the same user from different locations
Demand for local storage at the desktop is reduced
Storage can be added more economically and partitioned among users—Highly scalable
Data can be backed up form the common repository more efficiently than from desktops
Multiple file servers can be consolidated into a single managed storage pool
SAN Storage Area Network (NAS’s Big Brother)
Okay—So what is it?
In short, SAN is essentially just another type of network, consisting of storage components (instead of computers), one or more interfaces, and interface extension technologies. The storage units communicate in much the same form and function as computers communicate on a LAN.
SANs are the Future of Storage
The Internet revolution will push SANs into mainstream along with NAS units. The need for storage connectivity and improved reliability will demand more than other storage media can produce
Advantages of SANs
Reduces Network bottlenecks
Allows backup of storage devices with minimal impact on production operations
Flexibility in configuration
Overview of Selection Criteria for Different Storage Mediums