What causes error code: 91:29 in CommVault Simpana and how can it be resolved?
Error 91:29 is one of the more frustrating errors that can occur with CommVault Simpana. The actual error text is:
Error Code: 91:29 -- Unable to Download the VMX File for Virtual Machine […].
In addition to the error message, you may see an error message stating: Expected put message got: error.
This error occurs in situations in which .VMX files are stored within a VMware data store that is shared by multiple hosts. Normally, an ESX host places a lock on .VMX files when a virtual machine is powered on, thereby causing access attempts from other hosts to fail.
By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers.
This particular error (error code 91:29) only occurs under very specific circumstances. Specifically, it occurs when virtual machines are running Windows Server 2008 R2 Enterprise Edition on top of vSphere ESX 4.0. The problem occurs because the vCenter server is unable to determine which ESX host has locked the VMX file. If access is attempted from a host other than the one that has the lock on the file, then access will fail and an error message will be generated.
Although the error message specifically references the VMX files, CommVault documentation indicates that the problem can also occur as a result of a vCenter Server's inability to download .NVRAM files.
CommVault recommends that you solve this error by applying ESX 4.0 Update 2 or higher (you could also upgrade to a newer version of vSphere). As a last resort, you could create an identical set of credentials on each ESX host. For example, if your vCenter user is named CommVault, then you would need to create a user named CommVault on each one of your ESX servers. Keep in mind that the name CommVault is just an example. The name that you use should match your vCenter user name.
Dig Deeper on Backup and recovery software
Related Q&A from Brien Posey
Cloud-based backups can be secured via a variety of methods. Backup software and erasure coding may be just what is needed to improve your ...continue reading
Explore details regarding the growth of DR monitoring software from a focus on configuration validation to today's automated and more comprehensive ...continue reading
Through disk-based backup, continuous data protection enables backups to take place more often. Discover how to repair the technology's cost and ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.