## (Solved) Storage Design Calculations (Each correct answer 5 points) 1. Case Scenario An organization plans to deploy a new business application: - Required...

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Â Five questions forÂ Storage Design Calculations

Storage Design Calculations (Each correct answer 5 points)
1. Case Scenario
â€¢ An organization plans to deploy a new business application:
â€“ Required storage capacity = 1.5 TB
â€“ Peak I/O workload = 5200 IOPS
â€“ Typical I/O size = 4 KB
â€¢ Specifications of the available disk drive option:
â€“ RPM = 15,000
â€“ Storage capacity = 250 GB
â€“ Average seek time = 4.2 ms
â€“ Data transfer rate = 80 MB/s
Requirement:
â€¢ The application is business critical and must have an acceptable response time
Deliverable:
â€¢ Calculate the number of disk drives required for the application
2. Scenario:
â€¢ The financial activity of all regional offices of an organization is carried out through
an accounting application:
â€“ The application generates 15% random writes and 85% random reads
â€“ The storage currently has a 5-disk RAID 0 configuration
â€“ Each disk has an advertised formatted capacity of 250 GB
â€“ The total size of the applicationâ€™s data is 900 GB, which is unlikely to change
over the next six months
Requirements and challenges:
â€¢ The organization plans to reconfigure storage with fault tolerance â€¢ The organization cannot afford new disk purchases Deliverables:
â€¢ Recommend a RAID level for reconfiguring the storage to fulfill the organizationâ€™s
requirements â€¢ Justify the choice of RAID level based on cost, performance, and availability 3. Scenario:
â€¢ A system has three components and requires all three to be operational for 24 hours
from Monday to Friday. Failure of component 1 occurs as follows:
â€“ Monday = No failure
â€“ Tuesday = 5 am to 7 am
â€“ Wednesday = No failure
â€“ Thursday = 4 pm to 8 pm
â€“ Friday = 8 am to 11 am
Deliverables:
â€¢ Calculate the MTBF and MTTR of component 1 4. Scenario:
â€¢ A system has three components and requires all three to be operational from 8 am
to 5 pm, Monday to Friday. Failure of component 2 occurs as follows:
â€“ Monday = 8 am to 11 am
â€“ Tuesday = No failure
â€“ Wednesday = 4 pm to 7 pm
â€“ Thursday = 5 pm to 8 pm
â€“ Friday = 1 pm to 2 pm
Deliverable:
â€¢ Calculate the Information Availability of component 2 5. Scenario
â€¢ A customer performs a full backup on the first Sunday of the
month followed by a cumulative backup on the other Sundays.
They also perform an incremental backup each day Monday
through Saturday. Tapes are sent offsite for disaster recovery
every morning at 10 a.m. The customer experiences a system
crash on the Wednesday of the third week at 3 p.m., requiring a
system recovery.
Deliverable: How many days worth of tapes need to be retrieved to perform a recovery

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