通过循环连接三台服务器获取磁盘空间并转格式后发邮件

Here's a practical, streamlined script that checks your servers' D drive space, converts raw byte values to intuitive units (TB/GB/MB), and sends the formatted results via email—all without repeating commands for each server.

Step 1: Helper Function for Readable Size Conversion #

First, create a reusable function to turn those hard-to-read byte values into something human-friendly:

function Convert-ToReadableSize {
    param([decimal]$Bytes)
    
    # Define size units from smallest to largest
    $sizeUnits = @('B', 'KB', 'MB', 'GB', 'TB')
    $unitIndex = 0
    
    # Divide by 1024 until we reach a manageable unit
    while ($Bytes -ge 1024 -and $unitIndex -lt $sizeUnits.Count - 1) {
        $Bytes /= 1024
        $unitIndex++
    }
    
    # Return formatted string with 2 decimal places for clarity
    return "{0:N2}{1}" -f $Bytes, $sizeUnits[$unitIndex]
}

Step 2: Main Script Logic #

This section uses a loop to iterate over your server list, collects disk data, and processes it with the helper function. It also includes error handling for unreachable servers or permission issues:

# List of servers to check (easily add/remove entries here)
$targetServers = @('server01', 'server02', 'server03')

# Collect and process disk space data
$diskReport = foreach ($server in $targetServers) {
    try {
        # Fetch D drive info from the remote server
        $driveData = Invoke-Command -ComputerName $server -ScriptBlock { Get-PSDrive D } -ErrorAction Stop
        
        # Create a clean object with formatted values
        [PSCustomObject]@{
            'Server Name' = $server
            'Used Space'  = Convert-ToReadableSize $driveData.Used
            'Free Space'  = Convert-ToReadableSize $driveData.Free
        }
    }
    catch {
        # Handle errors gracefully and report them in the output
        [PSCustomObject]@{
            'Server Name' = $server
            'Used Space'  = "Error: $($_.Exception.Message.Split('`n')[0])"
            'Free Space'  = "Error: $($_.Exception.Message.Split('`n')[0])"
        }
    }
}

Step 3: Send Results via Email #

Convert the report to a styled HTML table for clean email formatting, then send it using your SMTP server:

# Convert the report to a styled HTML table
$emailBody = $diskReport | ConvertTo-Html -Title "D Drive Space Report" -Head @"
<style>
    table {border-collapse: collapse; width: 80%; margin: 20px auto;}
    th, td {border: 1px solid #ddd; padding: 10px; text-align: left;}
    th {background-color: #f2f2f2; font-weight: bold;}
    body {font-family: Arial, sans-serif;}
</style>
"@ | Out-String

# Configure email settings
$emailParams = @{
    From       = "disk-report@yourdomain.com"
    To         = "admin@yourdomain.com"
    Subject    = "D Drive Space Report - $(Get-Date -Format 'yyyy-MM-dd')"
    Body       = $emailBody
    BodyAsHtml = $true
    SmtpServer = "smtp.yourdomain.com"
    # Uncomment below if your SMTP server requires authentication
    # Credential = Get-Credential
}

# Send the email
Send-MailMessage @emailParams

Key Benefits #

• Loop-based execution: No redundant code—just update the $targetServers list to adjust which servers are checked.
• Error resilience: Catches issues like offline servers or permission errors and reports them clearly in the final output.
• Intuitive formatting: Converts raw bytes to TB/GB/MB with 2 decimal places for quick interpretation (e.g., 2.53T instead of 2534760280064).
• Professional email output: Styled HTML ensures the report is easy to read in any email client.

Example Email Output #

内容的提问来源于stack exchange，提问作者ursa Brown