Jasmine McTigue

Network Computing Blogger

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Where the Cloud Touches Down: Simplifying Data Center Infrastructure Management

Thursday, July 25, 2013
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In most data centers, DCIM rests on a shaky foundation of manual record keeping and scattered documentation. OpManager replaces data center documentation with a single repository for data, QRCodes for asset tracking, accurate 3D mapping of asset locations, and a configuration management database (CMDB). In this webcast, sponsored by ManageEngine, you will see how a real-world datacenter mapping stored in racktables gets imported into OpManager, which then provides a 3D visualization of where assets actually are. You'll also see how the QR Code generator helps you make the link between real assets and the monitoring world, and how the layered CMDB provides a single point of view for all your configuration data.

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Recovering From RedoLog Corrupt Errors On VMware ESX/ESXi

You will see the system cloning the disk to a new file. Once you are done you will have a vmname-repaired.vmdk and vmname-repaired-flat.vmdk file. Use a linux based text editor to edit the original vmname.vmx file and look for a line that says scsi0:0.fileName = "vmname-00001.vmdk" or something similar. Use the text editor to replace the vmname-00001.vmdk with the newly repaired vmname-repaired.vmdk. Repeat the cloning process with any other disks attached to your machine and you're done! Power on the virtual machine and you're ready to roll.

This method works great most of the time, however it can fail because of mangled virtual disk geometry. This happens when the disk attempts to commit writes on the most recent snapshot and fails, rendering the most recent snapshot file unusable. When this occurs, the clone process will inexplicably error out and you won't be able to complete the clone step above. The workaround for this is to target the next snapshot back in the chain. For example:

vm.vmdk has three snapshots. The first snapshot has a name of vm-000001.vmdk, the second vm-000002.vmdk and so forth up to vm-000003.vmdk, the final snapshot. Instead of targeting the clone operation at the parent vm.vmdk file, we can go ahead and target it at the second snapshot. The syntax for this is:

vmkfstools -i vm-000002.vmk vm-repaired.vmdk

This command will commit the changes up to and including snapshot two to a single vmdk which you can then edit into the .vmx file. This process does lose the changes in the final snapshot, but it can be the only way to recover a corrupt .vmdk file without restoring from backup. Good Luck!

Jasmine McTigue is the IT manager for Carwild Corp. She is responsible for IT infrastructure and has worked on numerous customer projects as well as ongoing network management and support throughout her 10-plus-year career.

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