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When you chose the Online menu option, Windows will without warning generate a new random disk signature and assign it to the disk by writing it to the MBR. It will then be able to process the MBR and mount the volumes present, but when Windows updates the disk signature, the BCD entries become orphaned, linked with the previous disk signature, not the new one. The boot loader will fail to locate the specified disk and boot files when booting from the disk and give up, reporting the following error:
MiniTool OEM program enable partners like hardware / software vendors and relative technical service providers to embed MiniTool software with their own products to add value to their products or services and expand their market.
Data storage devices are important parts of your computer. They can be used to save, port, and extract files. Usually, there is more than one storage device on your computer. In order to distinguish each device on your computer system, these devices have their unique numbers that are called Disk Signature for identification.
During the cloning process, drives need to make a similar copy to use both the cloned copy and the original one. At the same time, the virtualization tools are used to virtualize the physical hard disk drives that are virtualized to create virtual hard disk drive and several virtual machine clones are created with the existing Virtual hard disk drives.
You can see that they are identical copies, so it is quite possible that these copies might have the same disk signature. In a situation like this, you may encounter the disk signature collision issue.
In Windows 7, Windows 8 and Windows 10, the situation will be different. If two data storage drives have the same disk signature, the second drive that causes disk signature collision will be changed to the offline state automatically. You will be unable to use that disk before correcting the disk signature collision.
Instances created from Amazon Machine Images (AMIs) for Windows Server 2016 and 2019 use the EC2Launch v1 agent for a variety of startup tasks, including initializing EBS volumes. By default, EC2Launch v1 doesn't initialize secondary volumes. However, you can configure EC2Launch v1 to initialize these disks automatically, as follows.
The EC2Launch v1 agent can run instance initialization scripts such as initializeDisks.ps1 in parallel with the InitializeInstance.ps1 script. If the InitializeInstance.ps1 script reboots the instance, it might interrupt other scheduled tasks that run at instance startup. To avoid any potential conflicts, we recommend that you add logic to your initializeDisks.ps1 script to ensure that instance initialization has finished first.
If an instance running Microsoft Active Directory experiences a system failure or other critical issues you can troubleshoot the instance by booting into a special version of Safe Mode called Directory Services Restore Mode (DSRM). In DSRM you can repair or recover Active Directory.
How you enable DSRM and boot into the instance depends on the drivers the instance is running. In the EC2 console you can view driver version details for an instance from the System Log. The following table shows which drivers are supported for DSRM.
For information about how to enable enhanced networking, see Enable enhanced networking with ENA on your EC2 instances. For information about upgrading AWS PV drivers, see Upgrade PV drivers on Windows instances.
EC2 Windows instances do not have network connectivity before the operating system is running. For this reason, you cannot press the F8 button on your keyboard to select a boot option. You must use one of the following procedures to boot an EC2 Windows Server instance into DSRM.
If you suspect that Active Directory has been corrupted and the instance is still running, you can configure the instance to boot into DSRM using either the System Configuration dialog box or the command prompt.
Choose Launch instances and create a temporary instance in the same Availability Zone as the affected instance. Choose an instance type that uses a different version of Windows. For example, if your instance is Windows Server 2016, then choose a Windows Server 2019 instance.
In the EC2 console, detach the affected volume from the temporary instance and reattach it to your original instance with the device name /dev/sda1. You must specify this device name to designate the volume as a root volume.
By default, Windows instances use Coordinated Universal Time (UTC). If you set the time for your instance to a different time zone and then restart it, the time becomes offset and the instance temporarily loses its IP address. The instance regains network connectivity eventually, but this can take several hours. The amount of time that it takes for the instance to regain network connectivity depends on the difference between UTC and the other time zone.
For Windows instances, the instance console displays the output from tasks performed during the Windows boot process. If Windows boots successfully, the last message logged is Windows is Ready to use. You can also display event log messages in the console, but this feature might not be enabled by default depending on your version of Windows. For more information, see Configure launch settings for Amazon EC2 Windows instances.
For instances running Windows Server 2012 R2 and earlier, if the console output is empty, it could indicate an issue with the EC2Config service, such as a misconfigured configuration file, or that Windows failed to boot properly. To fix the issue, download and install the latest version of EC2Config. For more information, see Install the latest version of EC2Config.
For information about troubleshooting a Windows Server 2012 R2 instance that is not available on the network, see Windows Server 2012 R2 loses network and storage connectivity after an instance reboot.
The following procedure describes how to edit the Windows Registry using Registry Editor. If you are not familiar with the Windows Registry or how to safely make changes using Registry Editor, see Configure the Registry.
Locate the four-byte disk signature at offset 0x38 in the data. This is the Boot Configuration Database signature (BCD). Reverse the bytes to create the disk signature, and write it down. For example, the disk signature represented by the following data is E9EB3AA5:
To check the disk number for the volume with the disk signature collision, use the Disk Management utility. Open a command prompt, type compmgmt.msc and press Enter. In the left-hand navigation panel, double-click Disk Management. In the Disk Management utility, check the disk number for the offline volume with the disk signature collision.
The following information on this error has been compiled by NeoSmart Technologies, based on the information gathered and reported by our global network of engineers, developers, and technicians or partner organizations.
The disk signatures are used by an operating system to differentiate storage devices and access data. If the system detects that there are two different drives with the same signature available, it disables one of these drives automatically.
Startup Repair is an automated diagnosis and repair tool that is available from the Windows setup disc and can be used to find and repair some common problems. More information about how Startup Repair operates and what it does can be found in our knowledgebase. The following steps will initiate Startup Repair from the Windows setup disc:
Read more at Windows Recovery Disks.
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As Dominic said it seems like the SFR isn't cleaning up correctly which is confusing the VSS writer in the VMware tools when it tries to do a quiece. I suspect that after a SFR session if you did a disk scan you would be fine. Windows would see that disk 1 no longer exists and everything would work. It should be doing that scan after we remove the disk though....odd.
You are right. The SFR isn't cleaning up correctly and after unmounting the backup the remaining entries confuse the vss writer even there are no more mounted disks (sure i did rescan the disks in windows).
Last night, the NetApp SE sent me a link in which they suggest to reinstall the vmware tools without the VSS component which i did today. Now SFR and SMVI are working again as expected but the VMX still contains the entries of the SFR mounted disk!
Ran scheduled backups with quiescing option enabled on a 2008R2 SQL server, ran well for at least 6 months. We recently updated the environment from 4.1 to 5.0 Update 1 and now server backup fails with "The guest OS has reported an error during quiescing. The error code was: 3 The error message was: Error when notifying the sync provider. " We temporarily "fix" the issue by creating a snapshot, then going into the Snapshot manager and performing a "Delete All" clearing all the extra disks... until the next backup and then we start over again with the failure.
I just ran into this as well testing SFR. I noticed in the data store when the disks are attached and then removed that they're still in the VM's folder. I checked the VMX file and my VM is now referencing different sets of disks than it should be. It should be referencing RestoreTest_1.vmdk and RestoreTest.vmdk, but its now referencing RestoreTest-000002.vmdk and RestoreTest_1-000002.vmdk. As you can tell from the screenshot I've been doing some testing today. The disk files are from both the same VM and from another VM. My thoughts were that I would just use a VM to do restores to avoid this issue but perhaps there's another issue with doing that. However I don't see it actually consuming the space on the LUN. I assume that's because they were vClones.
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