Hi,

this probably has been done before, but here is my take. Make sure to run this as admin. Since the output of vssadmin depends on the OS's language, you have to make sure that the wrapper matches on the right string. You can change it with the -Match parameter.

Let me know what you think:

PARAM (

    [Parameter(Mandatory=$false)]
    [string]$Match='Writer name:'

)


foreach ($item in vssadmin list writers | Select-String -Context 0,4 "^$Match") {

    $VSSWriter =  $item.context.Postcontext.split(':')

    [PsCustomObject] @{

        'WriterName'        = $item.line.Split(':')[1].TrimStart(' ',"'",'"').TrimEnd("'",'"')
        'WriterId'          = [Guid]$VSSWriter[1].TrimStart(' ','{').TrimEnd(' ','}')
        'WriterInstanceId'  = [Guid]$VSSWriter[3].TrimStart(' ','{').TrimEnd(' ','}')
        'StateId'           = $VSSWriter[5].TrimStart(' ').TrimEnd(' ').Split(' ')[0].TrimStart('[').TrimEnd(']')
        'State'             = $VSSWriter[5].TrimStart(' ').TrimEnd(' ').Split(' ')[1]
        'LastError'         = $VSSWriter[7].TrimStart(' ').TrimEnd(' ')
    }  

}

Example:

.\Get-VssWriterStatus.ps1  | Where {$_.StateId -ne '1'}


WriterName       : Microsoft Hyper-V VSS Writer
WriterId         : 66841cd4-6ded-4f4b-8f17-fd23f8ddc3de
WriterInstanceId : f84fa5fc-16f2-4797-b5ad-7cd6a4e48725
StateId          : 8
State            : Failed
LastError        : Retryable error