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Disaster Recovery Planning (DRP)

Disaster Recovery Planning (DRP). Disaster Recovery Planning (DRP). DRP is the process of regaining access to the data, hardware and software necessary to resume critical business operations after a natural or human-induced disaster .

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Disaster Recovery Planning (DRP)

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  1. Disaster Recovery Planning (DRP)

  2. Disaster Recovery Planning (DRP) • DRP is the process of regaining access to the data, hardware and software necessary to resume critical business operations after a natural or human-induceddisaster. • A disaster recovery plan (DRP) should also include plans for coping with the unexpected or sudden loss of key personnel, although this is not covered in this article, the focus of which is data protection. • DRP is part of a larger process known as business continuity planning (BCP).

  3. What is the difference DRP and BCP(1/2) • Disaster recovery is the process by which you resume business after a disruptive event. • The event might be • something huge-like an earthquake or the terrorist attacks on the World Trade Center • something small, like malfunctioning software caused by a computer virus. • Given the human tendency to look on the bright side, many business executives are prone to ignoring "disaster recovery" because disaster seems an unlikely event.

  4. What is the difference DRP and BCP(2/2) • "Business continuity planning" suggests a more comprehensive approach to making sure you can keep making money. • Often, the two terms are married under the acronym BC/DR. • At any rate, DR and/or BC determines how a company will keep functioning after a disruptive event until its normal facilities are restored.

  5. What do these plans include (1/2) • All BC/DR plans need to encompass • how employees will communicate • where they will go • how they will keep doing their jobs. • The details can vary greatly, depending on the size and scope of a company and the way it does business.

  6. What do these plans include (2/2) • For example, The plan at one global manufacturing company • restore critical mainframes with vital data at a backup site within four to six days of a disruptive event, • obtain a mobile PBX unit with 3000 telephones within two days • recover the company's 1000-plus LANs in order of business need • set up a temporary call center for 100 agents at a nearby training facility.

  7. Events that necessitate disaster recovery • Natural disasters • Fire • Power failure • Terrorist attacks • Organized or deliberate disruptions • Theft • System and/or equipment failures • Human error • Computer viruses • Testing

  8. Prevention against data loss (1/2) • Backups sent off-site in regular intervals • Includes software as well as all data information, to facilitate recovery • Create an insurance copy on Microfilm or similar and store the records off-site. • Use a Remote backup facility if possible to minimize data loss • Storage Area Networks (SANs) over multiple sites make data immediately available without the need to recover or synchronize it

  9. Prevention against data loss (2/2) • Surge Protectors — to minimize the effect of power surges on delicate electronic equipment • Uninterruptible Power Supply (UPS) and/or Backup Generator • Fire Preventions — more alarms, accessible extinguishers • Anti-virus software and other security measures

  10. Techniques and technology • Mirroring • Disk mirroring : Redundant arrays of inexpensive disks 1 (RAID1) • Server mirroring: web / ftp /email • RAID : RAID0 – 6 and combination • On-site data storage • Back up - Tape / optical disk • Off-site data storage (backup-site) • Cold sites • Warm sites • Hot site

  11. Mirroring • Mirroring can occur locally or remotely. • Locally means that a server has a second hard drive that stores data. • A remote mirror means that a remote server contains an exact duplicate of the data. The second drive is called a mirrored drive. • Data is written to the original drive when a write request is issued. Data is then copied to the mirrored drive, providing a mirror image of the primary drive. • If one of the hard drives fails, all data is protected from loss.

  12. Disk mirroring (RAID1) • The replication of logical disk volumes onto separate physical hard disks in real time to ensure continuous availability, currency and accuracy. • A mirrored volume is a complete logical representation of separate volume copies

  13. Server mirroring • Mirror sites are most commonly used to provide multiple sources of the same information, and are of particular value as a way of providing reliable access to large downloads. • Mirroring is a type of file synchronization • Web server • To preserve a website or page, especially when it is closed or is about to be closed. • To counteract censorship and promote freedom of information • Email server • To protect loss of email information • ftp server • To allow faster downloads for users at a specific geographical location • Load balancing

  14. Redundant arrays of inexpensive disks (RAID) • The organization distributes the data across multiple smaller disks, offering protection froma crash that could wipe out all data on a single, shared disk. • Benefits of RAID include the following • Increased storage capacity per logical disk volume • High data transfer or I/O rates that improve information throughput • Lower cost per megabyte of storage • Improved use of data center floor space

  15. RAID0 • RAID Level 0 -aka. a stripe set or striped volume) splits data evenly across two or more disks (striped) with no parity information for redundancy. • It is important to note that RAID 0 provides zero data redundancy. • RAID 0 is normally used to increase performance • A RAID 0 can be created with disks of differing sizes, but the storage space added to the array by each disk is limited to the size of the smallest disk

  16. RAID1 • A RAID 1 creates an exact copy (or mirror) of a set of data on two or more disks. • This is useful when read performance or reliability are more important than data storage capacity. • Such an array can only be as big as the smallest member disk. • A classic RAID 1 mirrored pair contains two disks (see diagram), which increases reliability

  17. RAID2 • A RAID 2 stripes data at the bit (rather than block) level, and uses a Hamming code for error correction. • Extremely high data transfer rates are possible. • RAID 2 is the only standard RAID level which can automatically recover accurate data from single-bit corruption in data. • At the moment, there are no commercial implementations of RAID-2

  18. RAID3 • RAID Level 3uses byte-level striping with a dedicated parity disk. • RAID 3 is very rare in practice. • One of the side-effects of RAID 3 is that it generally cannot service multiple requests simultaneously. • This comes about because any single block of data will, by definition, be spread across all members of the set and will reside in the same location. • So, any I/O operation requires activity on every disk.

  19. RAID4 • RAID Level 4 uses block-level striping with a dedicated parity disk. • This allows each member of the set to act independently when only a single block is requested. • RAID 4 looks similar to RAID 3 except that it stripes at the block level, rather than the byte level. • In the example , a read request for block "A1" would be serviced by disk 0. A simultaneous read request for block B1 would have to wait, but a read request for B2 could be serviced concurrently by disk 1.

  20. RAID5 • A RAID 5 uses block-level striping with parity data distributed across all member disks. • RAID 5 has achieved popularity due to its low cost of redundancy. • A minimum of 3 disks is generally required for a complete RAID 5 configuration. • In the example, a read request for block "A1" would be serviced by disk 0. • A simultaneous read request for block B1 would have to wait, but a read request for B2 could be serviced concurrently by disk 1

  21. RAID6 • A RAID 6 extends RAID 5 by adding an additional parity block, thus it uses block-level striping with two parity blocks distributed across all member disks. • Improve reliability • Like RAID 5, the parity is distributed in stripes, with the parity blocks in a different place in each stripe.

  22. Nested RAID

  23. Storage Model

  24. Storage Area Network • The Storage Network Industry Association (SNIA) defines the SAN as a network whose primary purpose is the transfer of data between computer systems and storage elements. • A SAN consists of a communication infrastructure, which provides physical connections; and a management layer, which organizes the connections, storage elements, and computer systems so that data transfer is secure and robust.

  25. SAN ‘s definition • Put in simple terms, a SAN is a specialized, high-speed network attaching servers and storage devices • It is sometimes referred to as “the network behind the servers.” • A SAN introduces the flexibility of networking to enable one server or many heterogeneous servers to share a common storage utility, which may comprise many storage devices, including disk, tape, and optical storage.

  26. SAN Component • SAN Connectivity • the connectivity of storage and server components typically using Fibre Channel (FC). • SAN Storage • TAPE /RAID /ESS (Enterprise Storage System) /JBOD (Just Bunch of Disk) /SSA (Serial Storage Architecture) • SAN Server • Windows /Unix /Linux and etc

  27. Switched Fabric • An infrastructure specially designed to handle storage communications called a fabric. • A typical Fibre Channel SAN fabric is made up of a number of Fibre Channel switches. • Today, all major SAN equipment vendors also offer some form of Fibre Channel routing solution, and these bring substantial scalability benefits to the SAN architecture by allowing data to cross between different fabrics without merging them.

  28. Fiber Channel protocol • Fibre Channel is a layered protocol. It consists of 5 layers, namely: • FC0 The physical layer, which includes cables, fiber optics, connectors, pinouts etc. • FC1 The data link layer, which implements the 8b/10b encoding and decoding of signals. • FC2 The network layer, defined by the FC-PI-2 standard, consists of the core of Fibre Channel, and defines the main protocols. • FC3 The common services layer, a thin layer that could eventually implement functions like encryption or RAID. • FC4 The Protocol Mapping layer. Layer in which other protocols, such as SCSI, are encapsulated into an information unit for delivery to FC2.

  29. IP Storage Networking • FCIP (Fiber Channel over IP) • It is a method for allowing the transmission of Fibre Channel information to be tunneled through the IP network. • iFCP (Internet Fiber Channel Protocol) • It is a mechanism for transmitting data to and from Fibre Channel storage devices in a SAN, or on the Internet using TCP/IP • Internet SCSI (iSCSI) • It is a transport protocol that carries SCSI commands from an initiator to a target.

  30. FCIP (Fiber Channel over IP) • FCIP encapsulates FC frames within TCP/IP, allowing islands of FC SANs to be interconnected over an IP-based network • TCP/IP is used as the underlying transport to provide congestion control and in-order delivery FC Frames • All classes of FC frames are treated the same as datagrams • End-station addressing, address resolution, message routing, and other elements of the FC network architecture remain unchanged

  31. iFCP • iFCP is a gateway-to-gateway protocol for implementing a fibre channel fabric over a TCP/IP • Traffic between fibre channel devices is routed and switched by TCP/IP network • The iFCP layer maps Fibre Channel frames to a predetermined TCP connection for transport • FC messaging and routing services are terminated at the gateways so the fabrics are not merged to one another

  32. iSCSI • iSCSI is a SCSI transport protocol for mapping of block-oriented storage data over TCP/IP networks • The iSCSI protocol enables universal access to storage devices and Storage Area Networks (SANs) over standard TCP/IP networks

  33. Back up site • A backup site is a location where a business can easily relocate following a disaster, such as fire, flood, or terrorist threat. This is an integral part of the disaster recovery plan of a business. • A backup site can be another location operated by the business, or contracted via a company that specializes in disaster recovery services. • In some cases, a business will have an agreement with a second business to operate a joint disaster recovery facility.

  34. Cold Sites • A cold site is the most inexpensive type of backup site for a business to operate. • It provides office spaces to operate • It does not include backed up copies of data and information from the original location of the business, nor does it include hardware already set up. • The lack of hardware contributes to the minimal startup costs of the cold site, but requires additional time following the disaster to have the operation running at a capacity close to that prior to the disaster.

  35. Warm Sites • A warm site is a location where the business can relocate to after the disaster that is already stocked with computer hardware similar to that of the original site, but does not contain backed up copies of data and information.

  36. Hot Sites • A hot site is a duplicate of the original site of the business, with full computer systems as well as near-complete backups of user data. • Ideally, a hot site will be up and running within a matter of hours. This type of backup site is the most expensive to operate. • Hot sites are popular with stock exchanges and other financial institutions who may need to evacuate due to potential bomb threats and must resume normal operations as soon as possible.

  37. How to choose • Choosing the type is mainly decided by a company's cost vs. benefit strategy. • Hot sites are traditionally more expensive than cold sites since much of the equipment the company needs has already been purchased and thus the operational costs are higher. • However if the same company loses a substantial amount of revenue for each day they are inactive then it may be worth the cost.

  38. The advantages of a cold site are simple--cost. It requires much fewer resources to operate a cold site because no equipment has been bought prior to the disaster. • The downside with a cold site is the potential cost that must be incurred in order to make the cold site effective. • The costs of purchasing equipment on very short notice may be higher and the disaster may make the equipment difficult to obtain.

  39. Discovery Planningsteps(1/3) • Assess business impact and risk. • This should include an assessment of the business unit's function and, preferably, a business impact analysis (BIA). • The purpose of the assessment is to determine the business unit's relative contribution to the larger organization (monetary and functional). • The greater the potential impact, the more money a company should spend to restore a system or process quickly. • For instance, a stock trading company may decide to pay for completely redundant IT systems that would allow it to immediately start processing trades at another location.

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