SLA’s (Service Level Agreements)

• Microsoft Azure Gives gurantees to all services in terms of availability
• In Case of storage we have SLA’s around durability as well.

Redundancy in Azure Storage Account

• LRS ( Locally Redundant Storage)
  • Any data uploaded will make three synchronous copies in 3 different physical servers
    
• ZRS (Zone Redundant storage)
  • Any data uploded will make three syncronous copies into 3 different zones
    
• RA-GRS (Read only – Geo-Redundant Storage)
  • Create 3 synchoronous in same region as LRS and 3 asynchronous copies in secondary region
    
• RA – GZRS
  
• Durability and Availability options Refer Here

Storage Account Creation Options w.r.t Redundancy

• Region with Zones
  
• Regions without Zones
  

Access Tier in Storage Account

• Refer Here for official docs
• Hot: This is default access tier and is used for frequently accessed data.
  • Storage cost is highest
  • Access Cost is cheapest
• Cool: This is access tier which is used for infrequently accessed data.
  • Storage cost is moderate
  • Access cost is more
• Cold Tier: This is access tier which is used for infrequently accessed data. This data has to be atleast 90 days old
  • Storage cost is less than cool
  • Access cost is more
• Archive Tier:
  • Storage cost is cheapest
  • No access.
  • If you want to access convert the access tier of the file to hot or cool.
  • Rehydrating the Access tier Refer Here
• Refer Here for pricing calculator

Exercise

• Create a pricing estimate for storage account
  • size: 100 TB
  • location: east us
• Hot,cool,archive (only storage costs)
• Operations (Hot and cool):
  • 1000000 write operations
  • 1000000 read operations
• Rehyration cost for archive tier