Storage

Question 1

LRS

Answer 1

Locally redundant storage (LRS) provides at least 99.999999999% (11 nines) durability of objects over a given year. LRS provides this object durability by replicating your data to a storage scale unit. A datacenter, located in the region where you created your storage account, hosts the storage scale unit.

Question 2

ZRS

Answer 2

Zone-redundant storage (ZRS) replicates your data synchronously across three storage clusters in a single region.

Question 3

GRS

Answer 3

Geo-redundant storage (GRS) is designed to provide at least 99.99999999999999% (16 9’s) durability of objects over a given year by replicating your data to a secondary region that is hundreds of miles away from the primary region. If your storage account has GRS enabled, then your data is durable even in the case of a complete regional outage or a disaster in which the primary region isn’t recoverable.

Question 4

RA-GRS

Answer 4

Read-access geo-redundant storage (RA-GRS) maximizes availability for your storage account. RA-GRS provides read-only access to the data in the secondary location, in addition to geo-replication across two regions.

Question 5

Block Blob

Answer 5

Used to store documents, videos, files, unstructured data. Max size is 4.77TB

Question 6

Append Blob

Answer 6

A blob that supports appending data to the end, useful for logs

Question 7

Page Blob

Answer 7

Used for random read and write operations, used for VHDs within VMs. Max size is 8TB

Question 8

Archive Access Tier

Answer 8

optimized for storing data that is rarely accessed and stored for at least 180 days with flexible latency requirements (on the order of hours).

Question 9

Cool Access Tier

Answer 9

optimized for storing data that is infrequently accessed and stored for at least 30 days.

Question 10

Hot Access Tier

Answer 10

is optimized for storing data that is accessed frequently.

Question 11

Standard Tier

Answer 11

HDD or SSD
Page blob and block blob
file, table and queue
LRS, ZRS, GRS, RA-GRS

Question 12

Premium Tier

Answer 12

Always SSD
Only page blob
Only LRS

Question 13

Immutable Blob Storage: Time-based retention

Answer 13

Puts an immutable hold on blobs for a specified amount of days. Meets regulator compliance for many enterprises, such as financial institutions.

Question 14

Immutable Blob Storage: Legal Hold

Answer 14

Similar to time-based retention but without the retention day limit.

Question 15

Storage Queue Message Size Constraint

Answer 15

64 KB