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How To Fix - "AWS EBS Volume Stuck in the "Attaching" State?


In this post, we will explore How To Fix - "AWS EBS Volume Stuck in the "Attaching" State. Sometimes even after attaching AWS Elastic Block Store (EBS) to your AWS Elastic Compute Cloud (EC2) instance, it stays in the "attaching" state for sometime. Let's explore how we can fix  this issue.  

Check 1:

Firstly do the basic checks if you have correctly done the attach process.

  • A sample attach-volume command


aws ec2 attach-volume --volume-id vol-zzzzzzz --instance-id i-yyyyyyyyyyyyyyyyy --device /dev/sdf
{
"AttachTime": "2022-05-25T23:43:12.060000+00:00",
"Device": "/dev/sdf",
"InstanceId": "i-yyyyyyyyyyyyyyyyy ",
"State": "attaching",
"VolumeId": "vol-zzzzzzz "
}
 

  • Check what do you get with the lsblk command


lsblk
 

  • Check the NVMe Device name


sudo ebsnvme-id /dev/nvme0n1 -u
OR



sudo ebsnvme-id /dev/nvme0n1 -u
 

  • List all the NVMe devices and check with which has the associated device name.
 



$ DEV=xvda
$ lsblk | grep disk | awk '{print $1}' | while read disk; do echo -n "$disk " && sudo ebsnvme-id -b /dev/$disk; done | grep $DEV | awk '{print $1}'
nvme0n1
   

Check 2:

Check that the device name you specified when you attempted to attach the EBS volume isn't already in use. If the specified device name is already being used by the block device driver of the EC2 instance, the operation fails. When attaching an EBS volume to an Amazon EC2 instance, you can specify a device name for the volume (by default, one is filled in for you). The block device driver of the EC2 instance mounts the volume and assigns a name. The volume name can be different from the name that you assign.

  • Verify the device name that you specified while attaching the EBS volume - is already in use or not.
    • In case the specified device name is being used already by the EC2 block device driver, it will fails.
 

  • While attaching an EBS volume to an AWS EC2 instance, you have the option to correlate a device name for the volume. If you dont do this, then by default, one is filled in.
    • The block device driver of the EC2 instance mounts the volume and assigns a name.
    • The volume name can be different from the name that you specify.
 

  • There might be a scenario - that you used a device name - which is not in-use by AWS EC2 instance.. But is used by the block device driver within the EC2 instance. The attachment of the AWS EBS volume fails in such a case. The EBS volume remains stuck in the attaching state.
    • One reason for this can be - the block device driver is remapping the specified device name. e.g. say while /dev/sda1 is remapped to /dev/xvda and you try to attach a secondary AWS EBS volume to /dev/xvda, the secondary EBS volume will be stuck in the attaching state - instead of getting attached.
    • Another reason can be - the block device driver never released the device name i.e. the block device driver might still be using it. And when you try to use such a device name to attach a volume, it will stay stuck in the attaching state.
   

Check 3:

Assuming you had followed the Check 1 & Check 2 steps, you can proceed with the subsequent steps -

  • Force Detach the Volume.
 

  • Reboot or Restart the EC2 instance.
 

  • If still you are facing the same issue, you could use a Different device name.
  Hope the above process helps to solve the issue.    

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