Hi,
Here is an "example" WFA command that will wait for a directory to exist (or until a timeout is exceeded). You can apply the same principle to a snapmirror update for the volume or you can just wait for the your snapmirror schedule to update the volume to the destination and use this command to wait for the Qtree you've created on production to replicate to your DR vserver. It really depends on your environment, it might be fine to invoke a snapmirror update for the entire volume (just to replicate the qtree) or your network team might disapprove of that happening more frequently than your agreed snapmirror schedule.
In the following example, the command will "attempt" to read a directory, if it fails, it will wait X seconds (defined by the $WaitInterval variable) until either the directory exists or the $TimeOut values is exceeded.
Source Code:
Param(
[Parameter(Mandatory=$true, HelpMessage="The Cluster name or IP Address")]
[String]$ClusterName,
[Parameter(Mandatory=$true, HelpMessage="The Vserver name")]
[String]$VserverName,
[Parameter(Mandatory=$True, HelpMessage="The junction path of the directory to read")]
[String]$Path,
[Parameter(Mandatory=$True, HelpMessage="The total Number of seconds to wait")]
[Long]$TimeOut,
[Parameter(Mandatory=$True, HelpMessage="The number of seconds to wait in between checks")]
[Long]$WaitInterval
)
#'------------------------------------------------------------------------------
Function Wait-ReadDirectory{
<#
.SYNOPSIS
This function verifies a directory exist or waits for it to be created within a specified timeout.
.DESCRIPTION
Checks if a directory exists or waits for it to be created and returns a boolean.
.PARAMETER
ClusterName Accepts a string containing the destination clusters name or IP Address.
.PARAMETER
VserverName Accepts a string containing the destination vserver hostname.
.PARAMETER
Path Accepts a string containing the junction path of the directory to check it exists.
.PARAMETER
TimeOut Accepts an integer containing the maximum number of seconds to wait for snapmirror operations.
.PARAMETER
WaitInterval Accepts an integer containing the maximum number of seconds to wait in between attempting to read the directory.
.EXAMPLE
Wait-ReadDirectory -VserverName vserver1 -Path "/vol/vol1/qtree1" -TimeOut 3600 -WaitInterval 30
#>
#---------------------------------------------------------------------------
[CmdletBinding()]
Param(
[Parameter(Position=0,
Mandatory=$True,
ValueFromPipeLine=$True,
ValueFromPipeLineByPropertyName=$True)]
[String]$VserverName,
[Parameter(Position=1,
Mandatory=$True,
ValueFromPipeLine=$True,
ValueFromPipeLineByPropertyName=$True)]
[String]$Path,
[Parameter(Position=2,
Mandatory=$True,
ValueFromPipeLine=$True,
ValueFromPipeLineByPropertyName=$True)]
[Long]$TimeOut,
[Parameter(Position=3,
Mandatory=$True,
ValueFromPipeLine=$True,
ValueFromPipeLineByPropertyName=$True)]
[Long]$WaitInterval
)
#'---------------------------------------------------------------------------
#'Wait for the directory to be created or until the timeout is exceeded.
#'---------------------------------------------------------------------------
[Long]$waited = 0
[Long]$timeWaited = $waited
[Bool]$exists = $False
Do{
#'------------------------------------------------------------------------
#'Read the directory to ensure it exists.
#'------------------------------------------------------------------------
[Long]$timeWaited += [Long]($waited + $waitInterval)
[String]$command = "Read-NcDirectory -Path ""$Path"" -VserverContext $VserverName -ErrorAction Stop"
Try{
Invoke-Expression -Command $command -ErrorAction Stop
Get-WFALogger -Info -Message "Executed Command`: $command"
Get-WFALogger -Info -Message "The junction path ""$Path"" exists on vserver ""$VserverName"""
[Bool]$exists = $True
}Catch{
[Bool]$exists = $False
Get-WFALogger -Info -Message $("Failed Executing Command`: $command. Error " + $_.Exception.Message + ". Waiting ""$WaitInterval"" seconds before retrying.")
}
If(($exists) -And ($timeWaited -le $timeOut) -And $timeOut -gt 0){
Break;
}
Start-Sleep -Seconds $waitInterval
}Until(($exists) -Or (($timeWaited -ge $timeOut) -And $timeOut -gt 0))
#'------------------------------------------------------------------------
#'Log the total time waited for the directory to be created.
#'------------------------------------------------------------------------
If(($exists) -And ($timeWaited -lt $timeOut)){
Get-WFALogger -Info -Message "Waited a total of ""$timeWaited"" seconds for the junction path ""$Path"" to exist on vserver ""$VserverName"""
}
#'---------------------------------------------------------------------------
#'Raise an error if the timeout is exceeded.
#'---------------------------------------------------------------------------
If(($timeWaited -ge $timeOut) -And ($timeOut -gt 0) -And ($exists -eq $False)){
Get-WFALogger -Error -Message "The junction path ""$Path"" does not exist on the destination vserver ""$VserverName"" within the timeout of ""$timeOut"" seconds"
}
Return $exists;
}#End Function
#'------------------------------------------------------------------------------
#'Connect to the cluster.
#'------------------------------------------------------------------------------
Connect-WfaCluster $ClusterName
#'------------------------------------------------------------------------------
#'Create the command to read the directory.
#'------------------------------------------------------------------------------
If(-Not($Path.StartsWith("/vol/"))){
If($Path.StartsWith("/")){
[String]$p = $path.substring(1, ($path.length -1))
[String]$Path = "/vol/$p"
}Else{
[String]$Path = "/vol/$Path"
}
}
#'------------------------------------------------------------------------------
#'Wait for the directory to exist on the destination vserver.
#'------------------------------------------------------------------------------
If(Wait-ReadDirectory -VserverName $VserverName -Path $Path -TimeOut $TimeOut -WaitInterval $WaitInterval){
Get-WFALogger -Info -Message "The junction path ""$Path"" on vserver ""$VserverName` exists."
}Else{
Throw "The path ""$Path"" on vserver ""$VserverName"" does not exist or reached the wait timeout of ""$TimeOut"" seconds"
}
#'------------------------------------------------------------------------------
When testing it, i connected to a CIFS share at the root of a volume, wait for a while then created the test directory folder (in your instance that will be a qtree that is created on the destination vserver via snapmirror replication)
Example output:
Hope this helps.
/Matt
Public