OCI Foundations - Storage

Introduction

Persistent Storage / Non-Persistent Storage

• Local NVMe attached to an instance
• Copied to a NAS -> Block Volume
• File Storage -> 2 Compute Instances can share files/directories
• Object Storage -> Photos, Videos, Log files typically accesible via HTTP

Data Migration Services:

• Data Transfer Disk: send disk to Oracle
• Data Transfer Appliance: send larger system
• Storage Gateway: on-premise

Durable: multiple copies

Object Storage

• Ideal for unstructred/semi-structured data (photos, logs, etc)
• Regional, public service

• Objects: key/value pair + metadata
• Flat heireachy, unique name in namespace
• Namespace must have globally unique name
• Namespace -> Bucket -> Object

• https://objectstarage.us-sanjose-1.oraclecloud.com/n/intoracleohit/b/development/o/log.zip
  • Namespace: intoracleohit
  • Bucket: development
  • Object: log.zip

Standard Tier (hot):

• Instantaneous retrieval
• Fast, immediate access
• Most recent copy

Infrequent Access Tier (cool):

• Min storage for 31 days
• Retrieval fees
• Lower storage cost
• eg for backups

Archive Storage Tier (cold):

• Seldom accessed
• Min retention requirement of 90 days
• Restore time: 1 hr
• Downloaded to standard tier in 24 hours
• remote tape access

Cannot change tier once bucket is created. Private or Public access. Pre-authenticated requests:

• Bucket or Object level
• Extra security token is used to access the resource
• With a time expiry

Lifecycle Management, eg:

• After 30 days standard -> archive
• After 60 days, delete

Auto-tiering:

• Can move between Stanard and Infrequent Access tier to reduce costs.

Auto-versioning

Encryption:

• On by default
• Can specify your own keys

Block Volume

Persistent and Durable Storage:

• Create and attach disks
• Detatch and delete disks
• Keep data after the Compute Instance is deleted

Lower Cost tier:

• Large sequential workloads
• 2 IOPS/GB

Balanced tier:

• Random IO
• 60 IOPS/GB

Higher Performance Tier:

• Most demanding IO workloads
• 70 IOPS/GB

Ultra High Performance Tier:

• eg database
• 90-225 IOPS/GB

Auto-tune performance:

• Reduced when volume is detatched
• Reduces cost
• Virtual Performance Units can be adjusted: min/max thresholds

Encrypted Block Volumes:

• On by default
• Can bring own key
• At rest and in transit

Read/Write shareable:

• Multiple VMs can access a Block Volume

Resizing:

• Online, increase volume size

Replication:

• From one region to another
• Good for migration, disaster recovery

Volume Groups:

• Group together
• Can restore an entire VG from a backup

File Storage

Hierarchical collection ot documents organised into named directories. Distributed file systems, using NFS or SMB.

OCI File Storage Service:

• Shared storage for compute instances
• Support NFS v3
• Data protection: snapshots
• Encrypted at rest and in-transit