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Michal Dolnik
Michal Dolnik

Reputation: 111

Is Multi-Attach of Volume (EBS) allowed only for Nitro-based instances on AWS?

I want to share one volume between 2 instances on AWS. 1st instance is t2.large and 2nd instance is g2.2xlarge. After I tried to modify the existing volume type to iops2 and allow Multi-Attach option, it showed up, that Multi-attach is not allowed for this instance type (t2.large).

What instance types are allowed for this option? As a 2nd instance, I need instance with GPU. Aren't these instance types (g-types) allowed for this functionality?

Upvotes: 3

Views: 1912

Answers (2)

Jatin Mehrotra
Jatin Mehrotra

Reputation: 11624

These are some fundamental differences between EBS v/s EFS which might help someone when to use either of them.

  • sharing of one volume with multiple instance in the same az is allow with provisioned iops ebs type volumes however those instance should be nitro instances.AWS says "Multi-Attach enabled volumes can be attached to up to 16 Linux instances built on the Nitro System that are in the same Availability Zone."
  • The use case for multi attach is very specific, it is ideal for clustered linux applications that needs great availability, concurrent write operations, also you have to use file system which is clustered wared ( can't use xfs, ex4 etc).
  • EFS allows 100,1000's of concurrent ec2 instance in multi AZ ( single az is also poissble) but only for Linux instance.
  • Use case for EFs is content sharing, content management, Wordpress.
  • EBS is provisioned approach while EFS is pay per use so for a less data you will pay less, however EFS cost more than EBS.
  • EBS also support lifycle management tier to move file to IA- infrequent tier to reduce cost.

docs for efs

Upvotes: 2

Marcin
Marcin

Reputation: 238887

t2.large nor g2.2xlarge are not nitro. The list of nitro instances is here and includes:

Virtualized: A1, C5, C5a, C5ad, C5d, C5n, C6g, C6gd, C6gn, D3, D3en, G4, I3en, Inf1, M5, M5a, M5ad, M5d, M5dn, M5n, M5zn, M6g, M6gd, p3dn.24xlarge, P4, R5, R5a, R5ad, R5b, R5d, R5dn, R5n, R6g, R6gd, T3, T3a, T4g, and z1d

Bare metal: a1.metal, c5.metal, c5d.metal, c5n.metal, c6g.metal, c6gd.metal, i3.metal, i3en.metal, m5.metal, m5d.metal, m5dn.metal, m5n.metal, m5zn.metal, m6g.metal, m6gd.metal, mac1.metal, r5.metal, r5b.metal, r5d.metal, r5dn.metal, r5n.metal, r6g.metal, r6gd.metal, u-6tb1.metal, u-9tb1.metal, u-12tb1.metal, u-18tb1.metal, u-24tb1.metal, and z1d.metal

Update

ALternatively, you can use EFS which works with not only all instance types, but also ECS containers and lambda functions.

Upvotes: 4

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