Free Essay

Ciss 301

In: Computers and Technology

Submitted By GivenR01
Words 758
Pages 4
1. Seek and Search are often confused simply because in the English language, they mean the same things or are synonyms. The problem with this is that in Computer terms, Programming Languages and so forth, the concepts are often so complex as to take on different meanings
Seek time is “The time required to position the read/write head on the proper track from the time the I/O request is issued,” (McHoes, Flynn 552).
Search time differs in that it is “The time it takes to rotate the drum or disk from the moment an I/O command is issued until the requested record is moved under the read/write head,” (McHoes, Flynn 552).

8. The one I would choose is C-LOOK, which is similar to the Circular Scan (S-SCAN). C-LOOK reduces the movement of the R/Heads but rather than continuing past its last request, it goes no further. This can greatly reduce the amount of time needed for the particular item. This reduction in time means a greater degree of efficiency on the part of the system, ensuring the greatest number of users or requests are serviced, rather than letting jobs and requests clog up.

10. The majority of reasons why computer terms are confused is because most users will not or cannot take the time to learn the proper terms and their meaning. Couple this with the fact that not every one who is an expert is of the mind or ability to correct those they encounter, then the situation merely perpetuates and in some cases compounds. A perfect example of this is a recent situation at my job, where the terms Megabit and Megabyte were confused. Because people confuse the two, most applications measure speeds of data transfers in MB/s when they should be measuring in Mb/s. An item we were just launching was getting bad reviews because of slow transfer speeds, it was not until I pointed out the common mathematical error, and showed those I worked with what was going on did we understand it, however because it is such a gross common error, there is no correcting it. Buffering and spooling differ in that spooling is collecting the information transmitted from or to a slower device, such as a printer, and storing it in a file, while buffering is a temporary storage area residing in main memory. Buffering is used to store data before it is needed, spooling is used to collect data as it is coming in or going out.

16. Level 0 or RAID 0 was used in a previous gaming laptop of mine, its purpose was to speed the transfer, access and writing of data. I personally did not find it particularly useful as the HDD was not the throttle on this particular system, but rather the network adapter. I would find RAID 0 useful in an media streaming environment such as a media server that was streaming a movie to other devices over a small network. Using a good network adapter in a local network, coupled with RAID 0 on a SSD would allow the media files to play smoother than would be over slower adapter and older disks. Level 1 or RAID 1: I used RAID 1 in a Home Server, so that if there was a failure of my main disk, I could recover. Anything accessing customer data or storing financial information and transactions would need to use this. Level 3 being a more sophisticated version of 2, the same uses and applications apply here as well too. You could also use this in educational records, military records, and private financial data where the integrity of data is paramount. Another use is uncompressed video editing Level 4: Again this is long term file storage, such as a sever. It is very uncommon at this time, however, though used by NetApp in some of their appliances. Level 5 is used for databases that are heavily read oriented, it provides good redundancy and speed; you might find this in an application such as those used by the financial markets that track monetary gains or examine historical data or transactional data, such as in banks. It is also used in NAS devices and business servers. Level 6: Is as RAID 5 but offers a second independent distributed parity scheme. This allows the data for up to two drives to be rebuilt after failure. Those who use RAID 5 would use RAID 6 for the same reasons, and in the same applications.

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