![]() For example, it seems that volumes mounted pre-boot do not have the /dev/ prefix in the vendor info, while volumes mounted after have the /dev/ prefix. One thing I've noticed (and has been mentioned elsewhere) is that the device name in the vendor-specific name is different depending on when and how the volume is mounted. I've copied the current udev rules and scripts from the Amazon Linux AMI here: I can't seem to find the python script publicly, but it's available on the Amazon Linux AMI and is licensed under the Apache 2.0 license. I realize python is not installed on CoreOS, but the script could be rewritten to provide the basic functionality needed for udev renaming.Īn example udev rule without using the python script can be found here: AWS Linux handles this with the help of a python script named ebsnvme-id that read EBS information from the NVMe device. This would allow systemd mounts to work across all EC2 instance types without special hacks or relying on fixed device names. It would be great if CoreOS could provide similar rules. This keeps things consistent with the older naming rules and matches what is configured in EBS block device mappings provided when launching the instance. AWS Linux provides built-in udev rules that symlink the NVMe devices to their equivalent /dev/sd naming. With the newer m5 and c5 instances, EBS volumes show up as NVMe devices. AWS CoreOS 1688.5.3 HVM on m5.* or c5.* instances Desired FeatureĪdd udev symlink rules to map NVMe devices to traditional xvd device names. You can find more information on these cmdlets at. If you know your servers will be running only Windows Server 2012 R2, or later, you might want to use these newer Microsoft cmdlets. ![]() In Windows Server 2012 R2, Microsoft introduced new PowerShell storage-management cmdlets that replace the need to use the diskpart utility in many cases. $dpcommand = "create volume $type disk=$diskseries $disknumber = (Get-WmiObject -Class Win32_DiskDrive | where-object ).Index ![]() In order for our code to handle both cases, we can query WMI to see if the OS actually sees the volume. When an instance is launched from the AWS Management Console, the console performs some additional steps to have the instance metadata reflect only the ephemeral drives that are actually present. Using the same instance type (M3.Xlarge), but this time launching the instance from an AWS CloudFormation script (or AWS command-line tools), the same code produces this output: Here’s an example of the data returned from the metadata service for an M3.Xlarge instance (launched from the AWS Management Console) with one root EBS volume and two instance-store volumes: The following PowerShell statement retrieves all the block devices of a running Windows EC2 instance it is executed upon: $alldrives = (Invoke-WebRequest -Uri ).Content The EC2 metadata service provides a mechanism to determine this. In order to build a striped volume consisting only of instance-store volumes, we first need a mechanism to distinguish the volume types (EBS or ephemeral) associated with the instance. ![]() This is a common use case for many AWS customers. This blog post describes how the ephemeral volumes of any Windows EC2 instance can be detected at launch, and then automatically striped into one large OS volume. Many workloads can benefit from this type of temporary block-level storage, and it’s important to mention that ephemeral volumes also come with no extra cost. Because of the temporary nature of instance-store volumes, they are often referred to as ””’ephemeral”’-not lasting, enduring, or permanent”. The data in an instance store persists only during the lifetime of its associated instance. Instance-store volumes provide temporary block-level storage to the instance. Additional EBS drives can easily be added as desired.ĭepending on the EC2 instance type selected, there will also be from zero to 24 instance-store volumes automatically available to the instance. The root volume for Windows instances will always be a volume provided by the Amazon EBS service. Today we have another guest post by AWS Solutions Architect David Veith.Īmazon EC2 currently offers more than 20 current-generation instance types for your Windows operating system workloads.
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