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Advanced Hardware Fundamentals for Servers

Advanced Hardware Fundamentals for Servers. Network Servers. Servers can be any size Normally determined by number and type of hard drives or processors. What makes a Network Server is the software. Windows 2003 Server Novell Netware Linux. Services Provided by Servers.

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Advanced Hardware Fundamentals for Servers

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  1. Advanced Hardware Fundamentals for Servers

  2. Network Servers • Servers can be any size • Normally determined by number and type of hard drives or processors. • What makes a Network Server is the software. • Windows 2003 Server • Novell Netware • Linux

  3. Services Provided by Servers • Centralized security and login verification • Centralized backup and other utilities • Shared Storage Areas • Shared Applications • Communication between connected workstations

  4. RAID • Redundant Array of Independent (or Inexpensive) Disks. • Provides: • Performance Enhancement • Data Protection • Combination of Both • Any type of RAID requires multiple physical disk drives.

  5. RAID Controllers • Hardware • Controller functionality built into BIOS • If the motherboard doesn't support RAID, can be added with PCI card. • Software • All three NOS's provide for RAID functionality. • Software RAID consumes a LOT of resources, and should be the last choice.

  6. Types of RAID • Raid 0 (Striped Set) • Not really RAID because it doesn't provide redundant backup. • Combines two physical drives into one logical drive to increase performance. • Data is written to both drives at the same time. • Increases performance 30 to 50%. • If one drive fails, all information is lost. • Requires a minimum of 2 HD.

  7. Types of RAID • Raid 1 (Mirrored Set) • Provides perfect Fault Tolerance by copying everything done to a drive onto a second drive. • If a drive fails, the other can simply be inserted in its place. • For better Fault Tolerance, mirrored drives should be on different controllers.

  8. Types of RAID • RAID 0/1 (Also called RAID 10) • Combination of performance enhancement and fault tolerance. • Requires a minimum of 4 disks: 2 disks form a striped set, and the other 2 mirror them.

  9. Types of RAID • RAID 5 • Uses a more complicated scheme to provide fault tolerance. • Parity and error correction information is stored on each one of the drives. • If any one drive fails, information can be rebuilt from the parity information on the other drives. • The overhead is the equivalent of one drive. • Requires a minimum of 3 drives.

  10. Other Hardware Considerations For Servers • Most network servers have multiple network cards. • One to connect to the local network, and one to connect to ISP. • The two cards must use the same drivers. • Manufacturers of commercial grade cards (Cisco, 3Com) make dual cards, two NIC's on a single PCI card.

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