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[raid] section

Defines configuration settings for a RAID array that's built from a number of identical Amazon EBS volumes. The RAID drive is mounted on the head node and is exported to compute nodes with NFS.

The format is [raid raid-name]. raid-name must start with a letter, contain no more than 30 characters, and only contain letters, numbers, hyphens (-), and underscores (_).

[raid rs]
shared_dir = raid
raid_type = 1
num_of_raid_volumes = 2
encrypted = true

shared_dir

(Required) Defines the mount point for the RAID array on the head and compute nodes.

The RAID drive is created only if this parameter is specified.

Don't use NONE or /NONE as the shared directory.

The following example mounts the array at /raid.

shared_dir = raid

Update policy: If this setting is changed, the update is not allowed.

ebs_kms_key_id

(Optional) Specifies a custom Amazon KMS key to use for encryption.

This parameter must be used together with encrypted = true, and it must have a custom ec2_iam_role.

For more information, see Disk encryption with a custom KMS Key.

ebs_kms_key_id = xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

Update policy: If this setting is changed, the update is not allowed.

encrypted

(Optional) Specifies whether the file system is encrypted.

The default value is false.

encrypted = false

Update policy: If this setting is changed, the update is not allowed.

num_of_raid_volumes

(Optional) Defines the number of Amazon EBS volumes to assemble the RAID array from.

Minimum number of volumes is 2.

Maximum number of volumes is 5.

The default value is 2.

num_of_raid_volumes = 2

Update policy: If this setting is changed, the update is not allowed.

raid_type

(Required) Defines the RAID type for the RAID array.

The RAID drive is created only if this parameter is specified.

Valid options are the following values:

For more information on RAID types, see RAID info in the Amazon EC2 User Guide.

The following example creates a RAID 0 array:

raid_type = 0

Update policy: If this setting is changed, the update is not allowed.

volume_iops

(Optional) Defines the number of IOPS for io1, io2, and gp3 type volumes.

The default value, supported values, and volume_iops to volume_size ratio varies by volume_type and volume_size.

volume_iops = 3000

Update policy: This setting can be changed during an update.

† Maximum IOPS is guaranteed only on Instances built on the Nitro System provisioned with more than 32,000 IOPS. Other instances guarantee up to 32,000 IOPS. Older io1 volumes might not reach full performance unless you modify the volume. io2 Block Express volumes support volume_iops values up to 256000. For more information, see io2 Block Express volumes (In preview) in the Amazon EC2 User Guide.

volume_size

(Optional) Defines the size of the volume to be created, in GiB.

The default value and supported values varies by volume_type.

volume_size = 20

Update policy: If this setting is changed, the update is not allowed.

volume_throughput

(Optional) Defines the throughput for gp3 volume types, in MiB/s.

The default value is 125.

Supported values volume_throughput = 125–1000 MiB/s

The ratio of volume_throughput to volume_iops can be no more than 0.25. The maximum throughput of 1000 MiB/s requires that the volume_iops setting is at least 4000.

volume_throughput = 1000

Update policy: If this setting is changed, the update is not allowed.

volume_type

(Optional) Defines the type of volume to build.

Valid options are the following values:

For more information, see Amazon EBS volume types in the Amazon EC2 User Guide.

The default value is gp2.

volume_type = io2

Update policy: If this setting is changed, the update is not allowed.