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Replication is the copying of data from one system and its disks to another system and its completely independent and redundant set of disks. Replication is not the same as disk mirroring, because mirroring treats both sets of disks as a single, logical volume with enhanced availability, while replication treats the disk sets as two completely independent items. Mirroring is confined to a single computer system, while replication moves data from one system to another. When replication is done properly, the same ACID properties present in database systems will be in the replicated databases. (See the Database Servers section in 14, Data and Web Services for a discussion of ACID properties.) The end result is two consistent and equally viable data sets ideally in distinct physical locations. Since it further increases the data s availability, replication further increases your disk space requirements above RAID-1 or RAID-5, because each replicated disk set is usually a separate volume unto itself, with its own RAID implementation. Depending on the implementation, you could choose to replicate from a RAID 0+1 set to a RAID-5 set, or to a non-RAIDed set at your DR site. What you gain in return for the investment in disk spindles is the ability to recover from a large variety of performance and operational outages quickly, and with predetermined downtime.

22) In Figure 591, suppose the source Ethernet includes a Web server which is very busy serving requests from clients in the destination Ethernet Each HTTP response message is carried in one or more IP datagrams When the IP datagrams arrive to the frame relay interface, each datagram is encapsulated in a frame-relay frame Suppose that each Web object is of size O and each frame-relay packet is of size L Suppose that the Web server begins to serve one object at the beginning of each measurement interval Ignoring all packet overheads (at the application, transport, IP and frame-relay layers!), determine the maximum size of O (as a function of Tc, CIR and L) such that each object is entirely carried by high-priority frame-relay packets

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Another feature that appeared in JDK 1.1 is certificate technology based on the X.509v3 open standard. Certificates provide an authentication mechanism by which one site can securely recognize another. Sites that recognize each other have an opportunity to trust each other as well. When a secure socket layer (SSL) connection initializes between two machines, they handshake by exchanging certificates. SSL is discussed in the next section. A certificate is a piece of identification (credential) much like a driver's license. Information stored inside a typical certificate file includes the subject's name, the subject's public key, the certificate's issuer, the issuer's digital signature, an expiration date, and a serial number. So the question is, who gives out these certificates Someone (or some thing) called a certification authority (CA). There are a handful of companies that have set themselves up as CAs in the world. These include Netscape, GTE, Verisign, and a few others. But why should you trust them Good question. (See page 92.)

You are encouraged to surf the Web in answering the following questions 1) Roughly,what is the current price range of a 10 Mbps Ethernet adapter Of a 10/100 Mbps adapter Of a Gigabit Ethernet adapter 2) Hubs and switches are often priced in terms of number of interfaces (also called ports in LAN jargon) Roughly, what is current per-interface price range for a 10 Mbps hub For a 100 Mbps hub For a switch consisting of only 10 Mbps interfaces For a switch consisting of only 100 Mbps interfaces 3) Many of the functions of an adapter can be performed in software that runs on the node's CPU What are the advantages and disadvantages of moving this functionality from the adapter to the node 4) Use the Web to find the protocol numbers used in a Ethernet frame for IP and ARP 5) Is some form of ARP protocol necessary for IP over frame relay Why or why not

An enterprise might choose to replicate its data for several reasons:

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Probably the most popular use of replication is for disaster recovery. Sending data over a wide area network to a remote site means that the data will be protected in the event that something happens to the facility that contains the master server. It is this use of replication that leads us to place replication so high on the Availability Index. Other uses are valuable, but are not as critical to achieving high availability. Wide area replication, in fact, enables (but does not define) the 10th and final level of the Index, disaster recovery. Data can be replicated from one system to another within the same facility. In this model, the destination system can work on and with the replicated data independently of the master. The destination system might be used to generate reports, mine data, or perform tape backups, all without affecting the original copy of the data, or impacting the CPU, and therefore the users, of the master. Some FMS packages use replication to share their data. As we said in 15, Local Clustering and Failover, even though some vendors recommend it, we maintain that data sharing via replication is inferior to data sharing via shared disks.

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