UEC: Attach EBS volume to a running instance
First create a volume of the required size using euca-create-volume
$ euca-create-volume -s 10 -z mycloud VOLUME vol-333C04B8 10 creating 2010-03-26T05:20:56.383Z
Check the available volumes and their status with euca-describe-volumes
$ euca-describe-volumes VOLUME vol-333C04B8 10 mycloud available 2010-03-26T05:20:56.383Z
Now attach the volume to a running instance using euca-attach-volume
$ euca-attach-volume -i i-41620887 -d /dev/sdb vol-333C04B8
The volumes status changes from “available” to “in-use” if it is attached properly.
$ euca-describe-volumes VOLUME vol-333C04B8 10 mycloud in-use 2010-03-26T05:41:28.019Z ATTACHMENT vol-331F04B2 i-41620887 unknown,requested:/dev/sdb 2010-03-26T05:43:51.343Z
Once you login to the instance through ssh, you should see the new volume.
$ sudo fdisk -l Disk /dev/sda: 2195 MB, 2195718144 bytes 4 heads, 32 sectors/track, 33504 cylinders Units = cylinders of 128 * 512 = 65536 bytes Disk identifier: 0x000adc1c Device Boot Start End Blocks Id System /dev/sda1 1 32769 2097152+ 83 Linux /dev/sda3 32769 33504 47071 82 Linux swap / Solaris Disk /dev/sdb: 10.7 GB, 10737418240 bytes 64 heads, 32 sectors/track, 10240 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Disk identifier: 0x00000000 Disk /dev/sdb doesn't contain a valid partition table
Now /dev/sdb is ready to be formatted and mounted so that it can be used as a permanent storage. Unmount the volume before bringing down the instance, to avoid any data corruption.
For windows instances, creating the volume and attaching the volume would be the same.
NOTE: Even while attaching the device need to specified as /dev/sdb
The only change is the way this disk is accessed. Once the disk is attached to a running windows instance, perform the following steps:
- Connect to windows instance via RDP
- Go to Start -> Run and type diskmgmt.msc without the quotes. Select OK. This opens the Disk Management console.
- Right click on the new disk at the bottom of the list and choose Initialize Disk.
- A pop up will appear, choose OK.
- Next right click on the volume and select New Partition.
- A wizard appears and accept the defaults, other than change the disk letter as per need.
- Finish up the wizard, and windows will now format the partition.
After completion the disk management tool shows a healthy partition on the new drive.
If the network configuration on CC and NC has changed, say either the interfaces changed, due to which the ip addresses have also changed. In such cases the following errors appear in nc.log
[EUCAERROR ] libvirt: operation failed: adding scsi disk failed: pci_add pci_addr=auto storage file=/dev/etherd/e0.8,if=scsi failed to add file=/dev/etherd/e0.8,if=scsi (code=9) [Fri Mar 26 10:57:39 2010][EUCAERROR ] virDomainAttachDevice() failed (err=-1) XML= [Fri Mar 26 10:57:39 2010][EUCAERROR ] ERROR: doAttachVolume() failed error=1
In order to overcome this, the configuration has to be changed accordingly from the webUI. Access the webUI of UEC using https://:8443. On Configuration page, under Clusters section, replace the correct ip and interface name for Storage Controller.
See below screenshot.