Need peice of Powershell code to convert bytes to highest unit

[netappwala]

Hi

I am writing a script for volume reporting. Can anyone tell me best way converting bytes to higest possible unit.

and is $vol.SnapshotBlocksReserved return size in blocks? do I have to divide this with 1024 to convert into bytes?

Thanks

Charan

[asulliva · Accepted solution]

Use the "ConvertTo-FormattedNumber" cmdlet which ships with the NetApp PowerShell toolkit.  This will convert bytes to a human readable number...

PS C:\> ConvertTo-FormattedNumber -Value 1024000 -Type DataSize -NumberFormatString 0
1000 KB

PS C:\> ConvertTo-FormattedNumber -Value 10240000 -Type DataSize -NumberFormatString 0
10 MB

PS C:\> ConvertTo-FormattedNumber -Value 10240000 -Type DataSize -NumberFormatString 0.0
9.8 MB

PS C:\> ConvertTo-FormattedNumber -Value 102400000 -Type DataSize -NumberFormatString 0
98 MB

Notice that it will round based on the "-NumberFormatString" value.

If the result is in blocks, then each one represents 4096 bytes (4KB).  You'll need to multiply by 4096.  

Hope that helps.

Andrew

[netappwala]

Hi Andrew,

Is there any cmdlet to check volume and snapshot used capacity[the value return by "df -h" command's output("Capacity" field)] in percentage?

Thanks,

Charan

[asulliva]

It's returned by Get-NcVol in the "VolumeSpaceAttributes" property...

Get-NcVol | Select Name,@{'N' = "PercentageSnapShotReserveUsed"; 'E' = { $_.VolumeSpaceAttributes.PercentageSnapshotReserveUsed }}

Andrew

[netappwala]

I think DOT 7 Mode doesn't have that property 😞

[asulliva]

7-mode objects don't directly return as much information, but we can still get the data by querying for the oldest snapshot and using it's cumulative total:

Get-NaVol | %{ 
    $data = "" | Select Filesystem,Total,Used,Avail,Capacity
    
    $snapReserve = $_.SnapshotBlocksReserved * 1024
    $snapUsed = ($_ | Get-NaSnapshot | Sort-Object -Property Created | Select-Object -First 1).CumulativeTotal

    $data.Filesystem = "/vol/$($_.Name)/.snapshot"
    $data.Total = ConvertTo-FormattedNumber $snapReserve DataSize
    $data.Used = ConvertTo-FormattedNumber $snapUsed DataSize
    $data.Avail = ConvertTo-FormattedNumber ($snapReserve - $snapUsed) DataSize
    $data.Capacity = ConvertTo-FormattedNumber (($snapUsed / $snapReserve) * 100) Percent

    $data
}

Andrew

[netappwala]

Thats really useful Andrew. Below is what I found an alternative way.

((get-naefficiency Vol0).snapusage).Reserve

((get-naefficiency Vol0).snapusage).used

Now need help to create an array of snapshots created dates for a volume.  I know Its more powershell related query than Data ONTAP.

Eg: If the Vol0 has 10 snapshots, I want to create a string array of size 10 that each eliment carries one snapshot's created date.

Thanks

Kabir Charan

[asulliva]

The DateTime object is somewhat more useful...you can do comparisons and intervals and such much easier...

$snapTimes= (Get-NaSnapshot myvol).AccessTimeDT

Plus you can simply pipe to Out-String to get an actual string if needed...

$snapTimes= (Get-NaSnapshot myvol).AccessTimeDT | Out-String

Hope that helps.

Andrew