Advanced Features

Multi-Attach & Elastic Volumes

EBS Multi-Attach

Shared Access

Attach volume to multiple instances

io1/io2 Only

Only Provisioned IOPS SSD volumes

Same AZ

All instances must be in same AZ

Up to 16 Instances

Maximum concurrent attachments

Elastic Volumes

Dynamic Scaling

Modify size, type, IOPS online

No Downtime

Changes applied without stopping instance

6-Hour Cooldown

Wait between modifications

OS Extension

Extend file system after resize

Multi-Attach Use Cases & Requirements

Cluster File Systems

Shared storage for clusters

  • • Oracle RAC
  • • Red Hat GFS2
  • • OCFS2

High Availability

Failover scenarios

  • • Active-passive clusters
  • • Shared application data
  • • Quick failover

Requirements

Technical prerequisites

  • • Cluster-aware file system
  • • Application coordination
  • • Same AZ instances

Fast Snapshot Restore

Instant Performance

Full IOPS immediately available

Per-AZ Feature

Enable for specific AZs

Cost Impact

Additional charges per DSU

Use Cases

Critical workload recovery

RAID Configurations

RAID 0 (Striping)

Increased performance, no redundancy

RAID 1 (Mirroring)

Redundancy, same performance

RAID 10

Performance + redundancy

OS-Level

Configure in operating system

Volume Modification Process

1. Modify Volume

Change size, type, or IOPS via console/CLI

2. Monitor Progress

Check modification state in console

3. Extend Partition

Resize partition if size increased

4. Extend File System

Extend file system to use new space

Limitations & Considerations

Multi-Attach Limits

No standard file systems (ext4, NTFS)

Modification Cooldown

6-hour wait between changes

Size Restrictions

Cannot decrease volume size

Best Practices

Test Multi-Attach

Validate cluster file system behavior

Monitor Performance

Watch metrics during modifications

Backup Before Changes

Create snapshots before modifications

Plan Maintenance

Schedule during low-traffic periods

Advanced Features Exam Tips

  • • Multi-Attach only works with io1 and io2 volumes and requires cluster-aware file systems
  • • Elastic Volumes allow online modification of size, type, and IOPS with 6-hour cooldown
  • • Fast Snapshot Restore eliminates initialization penalty but incurs additional costs
  • • Multi-Attach instances must be in the same AZ and use coordinated applications
  • • Volume modifications require OS-level partition and file system extension
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