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User Guide for Windows Instances

AWS Documentation » Amazon EC2 » User Guide for Windows Instances » Storage » Amazon Elastic Block Store (Amazon EBS) » Amazon EBS and NVMe

Amazon EBS and NVMe

With the following instances, EBS volumes are exposed as NVMe block devices: C5, C5d, i3.metal, M5, M5d, R5, R5d, and z1d.

Note

The EBS performance guarantees stated in Amazon EBS Product Details are valid regardless of the block-device interface.

Identifying the EBS Device

You can use the Get-Disk command to map Windows disk numbers to EBS volume IDs.

Windows Server 2016

To get the volume IDs, select AdapterSerialNumber. In this example, the ID of volume 0 is "vol-0651a78c608e09c6a". 

PS C:\> Get-Disk | Select Number,AdapterSerialNumber | Sort-Object Number

Number AdapterSerialNumber
------ -------------------
     0 vol0651a78c608e09c6a
     1 vol03f93c68194556d14
     2 vol0dbd294c35c6174de

Windows Server 2012 R2

To get the volume IDs, select SerialNumber. In this example, the ID of volume 0 is "vol-01257d42be427a58b". 

PS C:\> Get-Disk | Select Number,SerialNumber | Sort-Object Number

Number SerialNumber
------ -------------------
     0 vol01257d42be427a58b_00000001.
     1 vol0da96b723afa69568_00000001.
     2 vol0d577fdabd6001831_00000001.

Working with NVMe EBS Volumes

The latest AWS Windows AMIs contain the AWS NVMe driver that is required by instance types that expose EBS volumes as NVMe block devices. However, if you resize your root volume on a Windows system, you must rescan the volume in order for this change to be reflected in the instance. If you launched your instance from a different AMI, it might not contain the required AWS NVMe driver. If your instance does not have the latest AWS NVMe driver, you must install it. For more information, see AWS NVMe Drivers for Windows Instances.

I/O Operation Timeout

Most operating systems specify a timeout for I/O operations submitted to NVMe devices. On Windows systems, the default timeout is 60 seconds and the maximum is 255 seconds. You can modify the TimeoutValue disk class registry setting using the procedure described in Registry Entries for SCSI Miniport Drivers.