Progress during large file copy (Copy-Item & Write-Progress?)
It seems like a much better solution to just use BitsTransfer, it seems to come OOTB on most Windows machines with PowerShell 2.0 or greater.
Import-Module BitsTransfer
Start-BitsTransfer -Source $Source -Destination $Destination -Description "Backup" -DisplayName "Backup"
I haven't heard about progress with Copy-Item
. If you don't want to use any external tool, you can experiment with streams. The size of buffer varies, you may try different values (from 2kb to 64kb).
function Copy-File {
param( [string]$from, [string]$to)
$ffile = [io.file]::OpenRead($from)
$tofile = [io.file]::OpenWrite($to)
Write-Progress -Activity "Copying file" -status "$from -> $to" -PercentComplete 0
try {
[byte[]]$buff = new-object byte[] 4096
[long]$total = [int]$count = 0
do {
$count = $ffile.Read($buff, 0, $buff.Length)
$tofile.Write($buff, 0, $count)
$total += $count
if ($total % 1mb -eq 0) {
Write-Progress -Activity "Copying file" -status "$from -> $to" `
-PercentComplete ([long]($total * 100 / $ffile.Length))
}
} while ($count -gt 0)
}
finally {
$ffile.Dispose()
$tofile.Dispose()
Write-Progress -Activity "Copying file" -Status "Ready" -Completed
}
}