Storage classes (Standard, Nearline, Coldline, Archive) in GCP - Mini Project: Build & Apply

GCP Storage Classes Setup

📖 Scenario: You are managing files for a company on Google Cloud Platform (GCP). Different files need different storage classes based on how often they are accessed.Standard storage is for files accessed frequently. Nearline is for files accessed less than once a month. Coldline is for files accessed less than once a quarter. Archive is for files rarely accessed but must be kept for years.

🎯 Goal: Create a Google Cloud Storage bucket configuration that sets the storage class for files based on their access frequency.

📋 What You'll Learn

Create a dictionary called files with file names as keys and their access frequency in days as values.

Create a variable called storage_classes that maps access frequency ranges to GCP storage classes.

Write a function called assign_storage_class that takes the access frequency and returns the correct storage class.

Create a dictionary called file_storage that assigns each file its storage class using the function.

💡 Why This Matters

🌍 Real World

Cloud storage costs depend on how often data is accessed. Choosing the right storage class saves money and meets access needs.

💼 Career

Cloud engineers and architects must configure storage classes correctly to optimize cost and performance in cloud projects.

1

Create the files dictionary

Create a dictionary called files with these exact entries: 'report.pdf': 5, 'backup.zip': 40, 'archive.tar': 100, 'old_logs.log': 400 where the values represent access frequency in days.

GCP

# Create the files dictionary with access frequency in days
# Your code here

Hint

Use a Python dictionary with file names as keys and numbers as values.

2

Create the storage_classes mapping

Create a dictionary called storage_classes with these exact entries: 'Standard': 0, 'Nearline': 30, 'Coldline': 90, 'Archive': 365. These numbers represent the minimum days of access frequency for each storage class.

GCP

files = {'report.pdf': 5, 'backup.zip': 40, 'archive.tar': 100, 'old_logs.log': 400}
# Create the storage_classes dictionary mapping days to storage classes
# Your code here

Hint

Use a dictionary with storage class names as keys and minimum days as values.

3

Write the assign_storage_class function

Write a function called assign_storage_class that takes a parameter days and returns the correct storage class string based on these rules: if days is less than 30, return 'Standard'; if less than 90, return 'Nearline'; if less than 365, return 'Coldline'; otherwise return 'Archive'.

GCP

files = {'report.pdf': 5, 'backup.zip': 40, 'archive.tar': 100, 'old_logs.log': 400}
storage_classes = {'Standard': 0, 'Nearline': 30, 'Coldline': 90, 'Archive': 365}
# Write the assign_storage_class function below
# Your code here

Hint

Use if-elif-else statements to check the days and return the storage class.

4

Assign storage classes to files

Create a dictionary called file_storage that uses a dictionary comprehension to assign each file in files its storage class by calling assign_storage_class with the file's access frequency.

GCP

files = {'report.pdf': 5, 'backup.zip': 40, 'archive.tar': 100, 'old_logs.log': 400}
storage_classes = {'Standard': 0, 'Nearline': 30, 'Coldline': 90, 'Archive': 365}
def assign_storage_class(days):
    if days < 30:
        return 'Standard'
    elif days < 90:
        return 'Nearline'
    elif days < 365:
        return 'Coldline'
    else:
        return 'Archive'
# Create file_storage dictionary using assign_storage_class
# Your code here

Hint

Use a dictionary comprehension to map each file to its storage class.

Practice

1. Which Google Cloud Storage class is best for data you need to access frequently and quickly?

easy

A. Standard

B. Nearline

C. Coldline

D. Archive

Solution

1. Step 1: Understand access frequency for each storage class

   Standard is designed for frequent access, Nearline for monthly, Coldline for quarterly, and Archive for rare access.

2. Step 2: Match frequent access requirement

   Since the question asks for frequent and quick access, Standard is the best fit.

3. Final Answer:

   Standard -> Option A

4. Quick Check:

   Frequent access = Standard [OK]

Hint: Frequent access? Choose Standard storage class [OK]

Common Mistakes:

• Choosing Archive for frequent access
• Confusing Nearline with Standard
• Thinking Coldline is for frequent data

2. Which storage class should you specify in the bucket creation command to store data accessed about once a month?

easy

A. gsutil mb -c coldline gs://my-bucket

B. gsutil mb -c nearline gs://my-bucket

C. gsutil mb -c archive gs://my-bucket

D. gsutil mb -c standard gs://my-bucket

Solution

1. Step 1: Identify the storage class for monthly access

   Nearline is designed for data accessed about once a month.

2. Step 2: Match the correct gsutil command syntax

   The command to create a bucket with Nearline storage class is 'gsutil mb -c nearline gs://my-bucket'.

3. Final Answer:

   gsutil mb -c nearline gs://my-bucket -> Option B

4. Quick Check:

   Monthly access = Nearline [OK]

Hint: Nearline = monthly access, use '-c nearline' in command [OK]

Common Mistakes:

• Using '-c coldline' for monthly access
• Using '-c archive' for monthly access
• Confusing command syntax with bucket name

3. You have a bucket with Coldline storage class. You upload a 10 GB file and access it immediately. What is true about the cost and access speed?

medium

A. Low storage cost, slower access speed with retrieval fee

B. High storage cost, slow access speed

C. Low storage cost, fast access speed

D. High storage cost, fast access speed

Solution

1. Step 1: Understand Coldline storage characteristics

   Coldline offers low storage cost but is designed for infrequent access, so access speed is slower and retrieval fees apply.

2. Step 2: Analyze immediate access impact

   Accessing data immediately in Coldline means paying retrieval fees and experiencing slower access compared to Standard.

3. Final Answer:

   Low storage cost, slower access speed with retrieval fee -> Option A

4. Quick Check:

   Coldline = low cost + slower access + retrieval fee [OK]

Hint: Coldline is cheap storage but slow and costly to access [OK]

Common Mistakes:

• Assuming Coldline has fast access speed
• Thinking Coldline has no retrieval fees
• Confusing Coldline with Standard class

4. A user created a bucket with the command gsutil mb -c standard gs://archive-data but wants to store rarely accessed data. What is the best fix?

medium

A. Delete and recreate bucket with -c archive option

B. Change storage class to Coldline using gsutil setclass coldline

C. Use gsutil rewrite -s archive gs://archive-data/** to change storage class

D. No fix needed; Standard is best for rare access

Solution

1. Step 1: Identify the problem with initial bucket creation

   The bucket was created with Standard class, which is costly for rarely accessed data.

2. Step 2: Find the correct method to change storage class without deleting bucket

   Using gsutil rewrite -s archive gs://archive-data/** changes storage class of existing objects to Archive without bucket recreation.

3. Final Answer:

   Use gsutil rewrite -s archive gs://archive-data/** to change storage class -> Option C

4. Quick Check:

   Change storage class with gsutil rewrite [OK]

Hint: Use gsutil rewrite to change storage class without bucket deletion [OK]

Common Mistakes:

• Deleting bucket unnecessarily
• Using non-existent gsutil setclass command
• Thinking Standard is best for rare access

5. A company wants to archive 100 TB of data that is accessed less than once a year but must be retrievable within hours if needed. Which storage class should they choose and why?

hard

A. Standard, because it offers fastest access

B. Nearline, because it balances cost and monthly access

C. Coldline, because it is cheaper and supports quarterly access

D. Archive, because it is lowest cost and retrieval is within hours

Solution

1. Step 1: Analyze access frequency and retrieval time needs

   Data is accessed less than once a year, so very rare access. Retrieval must be within hours.

2. Step 2: Match storage class to access pattern and retrieval speed

   Archive class is designed for rare access with lowest cost and retrieval times within hours, fitting the requirement.

3. Step 3: Compare with other classes

   Standard is costly, Nearline is for monthly access, Coldline is for quarterly access, so Archive is best.

4. Final Answer:

   Archive, because it is lowest cost and retrieval is within hours -> Option D

5. Quick Check:

   Rare yearly access + hours retrieval = Archive [OK]

Hint: Rare yearly access + hours retrieval? Choose Archive [OK]

Common Mistakes:

• Choosing Coldline for yearly access
• Assuming Archive retrieval takes days
• Picking Standard for cost savings