LAN WAN

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• LAN / WAN
• Business Proposal

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What is a LAN or WAN?

• A LAN is a Local Area Network it usually connects
  all computers in one building or several building
  within close proximity. Sharing files and
  folders, virtually as one computer.
• A WAN is a Wide Area Network that connects
  computer across a metropolitan area or a
  collection of several LANs across the world.

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Why should have a network?

• Network security is a major concern for all
  companies.
• By having a network you are then operating on an
  Intranet. (An internal private network, only
  accessible by its internal users with an Internet
  backbone. )
• Allowing for higher security of company data.

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Benefits vs Restrictions

• Higher security
• Less down time
• 24 hour 7days a week onsite service.
• Higher productivity
• Centralized Administration
• More reliable work stations
• Backup and Data storage on server

• No more random downloads (restricted sites)
• Shared bandwidth (all data packets in and out
  will be scanned for viruses)
• Authorized users (create user permissions)

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Disk Fault Tolerance..

• Fault tolerance is the ability of a computer to
  respond to catastrophic events with no data being
  lost or corrupted. Fully fault-tolerant systems
  using fault tolerant disk arrays prevent the loss
  of data.
• Disk fault tolerance is not an alternative to a
  back up strategy with off-site storage.
• RAID provides fault tolerance by using data
  redundancy. Writing data to more than one disk,
  for security in the event of a single hard drive
  failure.

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RAID

• Redundant Array of Independent Disks,
• a.k.a. Redundant Array of Inexpensive Disks is
  a standardization of fault tolerance options in
  five levels. The levels offer various
  combinations of performance, reliability and
  costs. RAID can save you time and money because
  you lose access to data while replacing the hard
  drive and uploading data.

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Types of RAID.

• RAID can be implemented as either a software or
  hardware solution
• RAID 1 mirrored volumes or RAID 5 volumes using
  Stripped volumes with parity are the software
  solutions.
• With software versions there is no fault
  tolerance following a failure until the fault is
  repaired. If a second fault occurs before the
  data lost from the first fault is regenerated,
  you can recover the data only by restoring it
  from a backup.

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Mirrored Volumes (RAID 1)
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RAID Hardware Solutions

• Hardware fault tolerance is more expensive than
  software fault tolerance
• Hardware fault tolerance solutions might use hot
  swapping of hard disks to allow for replacement
  of a failed hard disk without shutting down the
  computer and hot sparing so that a failed disk is
  automatically replaced by an online spare
• Windows operating system has RAID software-level
  restrictions that do not apply to RAID
  hardware-level configurations

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RAID 5

• Parity is a mathematical method of determining
  the number of odd and even bits in a number or
  series of numbers. This can also be used to
  reconstruct data if one number in a sequence of
  numbers is lost.
• If a single disk fails, Windows can use the data
  and parity information on the remaining disk to
  reconstruct the data that was on the failed disk.
  

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RAID 5 Parity Data Stripes
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RAID 5

• RAID 5 uses stripped volumes w/ parity
• RAID 5 has a cost advantage over mirrored volumes
  because disk usage is optimized. The more disk
  you have in a RAID 5 volume, the less the cost of
  the redundant stripe
• There are some restrictions that RAID-5 volumes
  implement in software. First, RAID-5 volumes
  involve a minimum of three drives and a maximum
  of 32 drives. Second, a software-level RAID-5
  volume cannot contain the boot or system
  partition

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• The following table shows how the amount of space
  required for the data stripe decreases with the
  addition of 2-gigabyte (GB) disks to the RAID-5
  volume

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How is this done?

• The software-level fault tolerance features of
  Windows Server are available only on Windows
  dynamic disks. In Windows Server, you create
  software-level mirrored and RAID-5 volumes by
  using the Create Volume wizard in the Computer
  Management snap-in.

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Data Backup and Storage

• Files You can store the files on a removable
  media device, such as an Iomega Zip drive, or on
  a network location, such as a file server. The
  file created contains the files and folders you
  have selected to backup. The file has a .bkf
  extension. Users can back up their personal data
  to a network server.
• Tape A less expensive medium than other removable
  media, a tape is more convenient for large backup
  jobs because of its high storage capacity.
  However, tapes have a limited life and can
  deteriorate. Be sure to check the tape
  manufacturer's recommendations for usage.

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Planning When to Backup

• You should plan your backup jobs to fit the needs
  of your company. The primary goal of backing up
  data is to be able to restore it if necessary, so
  any backup plan you develop should include how to
  restore data. You should be able to quickly and
  successfully restore critical lost data. There is
  no single correct backup plan for all networks.

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Determine What to Back Up

• Always back up critical files and folders that
  your company needs to operate, such as sales and
  financial records, the registry for each server,
  and the Active Directory store .

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Determine How Often to Back Up

• If data is critical for company operations,
  back it up daily. If users create or modify
  reports once a week, backing up the reports
  weekly is sufficient. You need to back up data
  only as often as it changes. For example, there
  is no need to do daily backups on files that
  rarely change, such as monthly reports

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Perform Network or Local Backup Jobs

• A network backup can contain data from multiple
  network computers. This allows you to consolidate
  backup data from multiple computers to a single
  removable backup media. A network backup also
  allows one administrator to back up the entire
  network. Whether you perform a network or local
  backup job depends on the data that must be
  backed up. For example, you can back up the
  registry and the Active Directory store only at
  the computer from which you are performing the
  backup.

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• If you decide to perform local backups, they must
  be performed at each computer, including servers
  and client computers. There are several things to
  consider in performing local backups. First you
  must move from computer to computer so that you
  can perform a backup at each computer, or you
  must rely on users to back up their own
  computers. Typically most users fail to back up
  their data on a regular basis. A second
  consideration with local backups is the number of
  removable storage media devices available. If you
  use removable storage media devices, such as tape
  drives, you must have one for each computer, or
  you must move the tape drive from computer to
  computer so that you can perform a local backup
  on each computer.

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• You can also choose to use a combination of
  network and local backup jobs. Do this when
  critical data resides on client computers and
  servers and you do not have a removable storage
  media device for each computer. In this
  situation, users perform a local backup and store
  their backup files on a server. You then back up
  the server.

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Recommended..

• I recommend a tape backup unit and tape backup
  software with a pack of tape media.
• Backups can be scheduled twice a week or as
  needed.

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Costs of the Installation

• Labor55 per/hour 8hrs/day 440 day
• 3 days 1320
• 4 days 1760
• Excluding the cost of the server hardware,
  software, and cost of wiring tech

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Network Options..

• Dell Servers
• HP Servers
• Customized McCoy Tech Servers