Operating systems questions help: 1. Find the Total Access Time based on hard dr

Question

Operating systems questions help:

1. Find the Total Access Time based on hard drive characterisitcs:

-Track order to access data- 10, 5 & 15 assuming read/write head is located at Track 0, Average Search Time or rotational delay: 8.4 ms, Average Transfer Time 100 bytes: 0.1 ms, Sizes of Data; 5 - 300 bytes, 10 - 150 bytes, 15 - 500 bytes, Average Seek Time: 0.75 ms per track

2. Questions on RAID:

-with two 500 GB hard drives configured as RAID Level 0 how much usable drive space exists:

-with two 500 GB hard drives configured as RAID Level 1 how much usable drive space exists:

-with three 500 GB hard drives configured as RAID Level 5  how much usable drive space exists:

-which RAID Level 0, 1 or 5 would create the maximum amount of usable drive space and provide fault tolerance and data redundancy:

Explanation / Answer

Question 2

   i. In RAID level 0 we can use all space so usable space is 1000GB

   ii. In RAID level 1 we can use only half of the space so usable space is 500 GB

   iv. Maximum usable drive space : RAID 0 because there is no overhead

         Maximum fault tolerance : RAID 5, it strips the disks similar to RAID 0, but does not provide        same disk speed. Has fault tolerance without the loss of any data.

          Maximum redundancy: RAID level 1 as blocks are mirrored

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