Need help to create WFA to clone a LUN from snapshot

Hitesh123 — Wed, 04 Jun 2025 11:12:03 GMT

Hi , i am new to WFA and i need to create a work flow which can clone a LUN using a snapshot of parent volume and export it to a host. Until now i have created work flow with below steps and currently i am stuck on step 4.

step 1 : - Cluster name --should be populated using mysql query -- this is already done

step 2 : - vserver name - - should be populated using mysql query -- this is already done

step 3 : - volume name -- - should be populated using mysql query -- this is already done

step 4 : - snapshot list -- It should populate the list of snapshots for volume selected in step 3. -- I am stuck here

my OCUM version is 7.2 and WFA version is 5.0 . While searching on google i found seems it is problem with schema cm_storage as there is no data for snapshot in it. But how i can fix it. I am sorry i am new to WFA so please excuse for basic questions.

Thanks in advance.

Re: Need help to create WFA to clone a LUN from snapshot

mbeattie — Tue, 28 Apr 2020 05:19:28 GMT

Hi,

The cm_storage database does not contain snapshots. You need to configure a Data source for it (Scheme, Dictionary and Data Source Types).

Create a scheme called 'cm_snapshots'
Create a Dictionary in the cm_snapshot' scheme called 'snapshot'
Create a Data Source Type in the 'cm_snapshots' scheme

Here is an example of the dictionary:

Here is the data source type:

#'------------------------------------------------------------------------------ #'Ensure that dates are always returned in English #'------------------------------------------------------------------------------ [System.Threading.Thread]::CurrentThread.CurrentCulture="en-US" #'------------------------------------------------------------------------------ #'Create the output file #'------------------------------------------------------------------------------ $snapshotCsv = "./snapshot.csv" New-Item -Path $snapshotCsv -type file -force $clusterAddress = Get-WfaRestParameter "host" Get-WFALogger -Info -Message "Enumerating Snapshots on Cluster ""$clusterAddress""" #'------------------------------------------------------------------------------ #'Connect to the cluster #'------------------------------------------------------------------------------ Try{ Connect-WfaCluster $clusterAddress -Timeout 300000 $c = Get-NcCluster -ErrorAction Stop }Catch{ Get-WFALogger -Error -Message $("Failed connecting to cluster ""$clusterAddress"". Error " + $_.Exception.Message) Throw "Failed connecting to cluster ""$clusterAddress""" } #'------------------------------------------------------------------------------ #'Create a query to filter snapshots #'------------------------------------------------------------------------------ $query = @{ Vserver = 'vs*'; Name = '!*snapmirror*'; } #'------------------------------------------------------------------------------ #'Set the snapshot attributes to query. #'------------------------------------------------------------------------------ $attributes = @{ AccessTime = ""; Dependency = ""; SnapshotInstanceUuid = ""; } #'------------------------------------------------------------------------------ #'Enumerate the snapshots. #'------------------------------------------------------------------------------ Try{ $snapshots = Get-NcSnapshot -Query $query -Attributes $attributes -ErrorAction Stop Get-WFALogger -Info -Message "Enumerated snapshots on cluster ""$clusterAddress""" }Catch{ Get-WFALogger -Error -Message $("Failed connecting to cluster ""$clusterAddress"". Error " + $_.Exception.Message) Throw "Failed connecting to cluster ""$clusterAddress""" } #'------------------------------------------------------------------------------ #'Add each snapshot to the CSV file for importing. #'------------------------------------------------------------------------------ ForEach($snapshot in $snapshots){ $vserver = $snapshot.Vserver $cluster = $c.ClusterName $volume = $snapshot.Volume $snapshotName = $snapshot.Name $dependency = $snapshot.Dependency $snapshotID = $snapshot.SnapshotInstanceUuid $timestamp = ($snapshot.AccessTimeDT).ToString("yyyy-MM-dd HH:mm:ss") Add-Content $snapshotCsv ([byte[]][char[]] "\N`t$cluster`t$snapshotName`t$timestamp`t$volume`t$vserver`t$dependency`t$snapshotID`n") -Encoding Byte } #'------------------------------------------------------------------------------

Hope that helps

/Matt

Re: Need help to create WFA to clone a LUN from snapshot

mbeattie — Tue, 28 Apr 2020 05:28:44 GMT

Also note that you can filter the query to meeting your requirements. In this example i've excluded snapmirror snapshots and filtered snapshots for volumes on vservers matching 'vs*' (EG vserver1, vserver2, vserver3 etc)

$query = @{ Vserver = 'vs*'; Name = '!*snapmirror*'; }

Update to meet your requirements

/Matt

Re: Need help to create WFA to clone a LUN from snapshot

Hitesh123 — Wed, 29 Apr 2020 21:24:03 GMT

Hi Matt,

Many thanks for your help. Let me try this. I will get back to you with results soon.

Thanks again.

Regards

Hitesh

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Need help to create WFA to clone a LUN from snapshot

Re: Need help to create WFA to clone a LUN from snapshot

Re: Need help to create WFA to clone a LUN from snapshot

Re: Need help to create WFA to clone a LUN from snapshot