Discussion Forums
Discussion Forums > Category: Compute > Forum: Amazon Elastic Compute Cloud (EC2) >Thread: lost my /dev/xvdb volume after i restart and change my ec instance type
Advanced search options
lost my /dev/xvdb volume after i restart and change my ec instance type
Posted by: woolhk
Posted on: Jul 5, 2013 5:09 PM
  Click to reply to this thread Reply
This question is answered.
i have a lot of data in /dev/xvdb which mount to /data.
after i restart and change my ec instance type, and start the instance again the /data becomes empty anyone know where i can retrieve it back?
Permlink Replies: 3 | Pages: 1 - Last Post: Aug 9, 2014 6:40 PM by: edpogi
Replies
Re: lost my /dev/xvdb volume after i restart and change my ec instance type
Posted by: PhilP@AWS
Posted on: Jul 5, 2013 9:30 PM
in response to: woolhk in response to: woolhk
  Click to reply to this thread Reply
Hi there woolhk,

This sounds like you have an Instance Store (or Ephemeral) drive attached to your instance as a secondary device. This type of storage is only temporary and should only be used for temporary files that require fast access (for example a page or swap file). When you Stop an EC2 instance that has an Instance Store volume, the data on this storage will be securely wiped (intentionally for security and privacy reasons) and when you start the Instance back up again the volume will be blank.

More information on Instance Store (or Ephemeral) storage can be found here:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceStorage.html

The data on your EBS volumes should be consistent across Instance Stops and Starts, so if you have only EBS volumes attached to your instance then please post back your InstanceID so that we can take a deeper look at this issue for you.

Best regards,
Phil P
Re: lost my /dev/xvdb volume after i restart and change my ec instance type
Posted by: woolhk
Posted on: Jul 5, 2013 11:30 PM
in response to: PhilP@AWS in response to: PhilP@AWS
  Click to reply to this thread Reply
hi Phil P, it looks like what you said is true that my /data is in instance storage. so may I confirm that there's no way I can retrieve back my data?
my instance is i-124f2e46
Re: lost my /dev/xvdb volume after i restart and change my ec instance type
Posted by: edpogi
Posted on: Aug 9, 2014 6:40 PM
in response to: woolhk in response to: woolhk
  Click to reply to this thread Reply
linux , ec2 , missingdisk
I lost my secondary disk too when I changed my plan and rebooted the server.

root@ip-10-60-7-151:~# mount /mnt
mount: special device /dev/xvdb does not exist

Instance ID: i-e53e2782