Disable usage of local SSD on Windows VMs.

Workaround for bazelbuild/bazel#5125.

buildkite/create_instances.py

@@ -92,7 +92,9 @@
     'buildkite-worker-windows-java8': {
         'count': 8,
         'image_family': 'buildkite-worker-windows-java8',
-        'local_ssd': 'interface=scsi',
+        # We need to boost the size in order to get better IOPS and throughput.
+        # See: https://cloud.google.com/compute/docs/disks/performance
+        'boot_disk_size': '1000GB',
         'metadata_from_file': 'windows-startup-script-ps1=startup-windows.ps1',
     },
 }

buildkite/setup-windows.ps1

@@ -270,8 +270,8 @@ SET BUILDKITE_ARTIFACT_UPLOAD_DESTINATION=gs://bazel-buildkite-artifacts/%BUILDK
 SET BUILDKITE_GS_ACL=publicRead
 SET JAVA_HOME=${env:JAVA_HOME}
 SET PATH=${env:PATH}
-SET TEMP=D:\temp
-SET TMP=D:\temp
+SET TEMP=C:\temp
+SET TMP=C:\temp
 "@
 [System.IO.File]::WriteAllLines("${buildkite_agent_root}\hooks\environment.bat", $buildkite_environment_hook)
 
@@ -296,10 +296,10 @@ Write-Host "Terminating all processes belonging to the `${buildkite_username} us
 & taskkill /FI "username eq `${buildkite_username}" /T /F
 Start-Sleep -Seconds 1
 
-Write-Host "Recreating fresh temporary directory D:\temp..."
-Remove-Item -Recurse -Force "D:\temp"
-New-Item -Type Directory "D:\temp"
-Add-NTFSAccess -Path "D:\temp" -Account BUILTIN\Users -AccessRights Write
+Write-Host "Recreating fresh temporary directory C:\temp..."
+Remove-Item -Recurse -Force "C:\temp"
+New-Item -Type Directory "C:\temp"
+Add-NTFSAccess -Path "C:\temp" -Account BUILTIN\Users -AccessRights Write
 
 Write-Host "Deleting home directory of the `${buildkite_username} user..."
 Get-CimInstance Win32_UserProfile | Where LocalPath -EQ "C:\Users\`${buildkite_username}" | Remove-CimInstance

buildkite/startup-windows.ps1

@@ -2,46 +2,33 @@
 $ErrorActionPreference = "Stop"
 $ConfirmPreference = "None"
 
-## Initialize, partition and format the local SSD.
-Write-Host "Initializing local SSD..."
-if ((Get-Disk -Number 1).PartitionStyle -ne "RAW") {
-  Clear-Disk -Number 1 -RemoveData -RemoveOEM
-}
-Initialize-Disk -Number 1
-New-Partition -DiskNumber 1 -UseMaximumSize -DriveLetter D
-Format-Volume -DriveLetter D -ShortFileNameSupport $true
 ## Load PowerShell support for ZIP files.
 Add-Type -AssemblyName "System.IO.Compression.FileSystem"
 
 ## Remove write access to volumes for unprivileged users.
 Write-Host "Setting NTFS permissions..."
 Remove-NTFSAccess "C:\" -Account BUILTIN\Users -AccessRights Write
-Remove-NTFSAccess "D:\" -Account BUILTIN\Users -AccessRights Write
-
-## Create temporary folder (D:\temp).
-Write-Host "Creating temporary folder on local SSD..."
-New-Item "D:\temp" -ItemType "directory"
-Add-NTFSAccess "D:\temp" -Account BUILTIN\Users -AccessRights Write
+Add-NTFSAccess "C:\temp" -Account BUILTIN\Users -AccessRights Write
 
-## Redirect MSYS2's tmp folder to D:\temp
+## Redirect MSYS2's tmp folder to C:\temp
 Remove-Item -Recurse -Force C:\tools\msys64\tmp
-New-Item -ItemType Junction -Path "C:\tools\msys64\tmp" -Value "D:\temp"
+New-Item -ItemType Junction -Path "C:\tools\msys64\tmp" -Value "C:\temp"
 
-## Create Buildkite agent working directory (D:\build).
-Write-Host "Creating build folder on local SSD..."
-New-Item "D:\build" -ItemType "directory"
-Add-NTFSAccess "D:\build" -Account BUILTIN\Users -AccessRights Write
+## Create Buildkite agent working directory (C:\build).
+Write-Host "Creating build folder..."
+New-Item "C:\build" -ItemType "directory"
+Add-NTFSAccess "C:\build" -Account BUILTIN\Users -AccessRights Write
 
 ## Setup the TEMP and TMP environment variables.
-[Environment]::SetEnvironmentVariable("TEMP", "D:\temp", "Machine")
-[Environment]::SetEnvironmentVariable("TMP", "D:\temp", "Machine")
+[Environment]::SetEnvironmentVariable("TEMP", "C:\temp", "Machine")
+[Environment]::SetEnvironmentVariable("TMP", "C:\temp", "Machine")
 $env:TEMP = [Environment]::GetEnvironmentVariable("TEMP", "Machine")
 $env:TMP = [Environment]::GetEnvironmentVariable("TMP", "Machine")
 
 ## Download the Buildkite agent token.
 Write-Host "Getting Buildkite Agent token from GCS..."
 $buildkite_agent_token_url = "https://storage.googleapis.com/bazel-encrypted-secrets/buildkite-agent-token.enc"
-$buildkite_agent_token_file = "d:\buildkite_agent_token.enc"
+$buildkite_agent_token_file = "C:\buildkite_agent_token.enc"
 (New-Object Net.WebClient).DownloadFile($buildkite_agent_token_url, $buildkite_agent_token_file)
 
 ## Decrypt the Buildkite agent token.
@@ -67,7 +54,7 @@ $buildkite_agent_config = @"
 token="${buildkite_agent_token}"
 name="%hostname-%n"
 tags="kind=worker,os=windows,java=8,image-version=${image_version}"
-build-path="d:\build"
+build-path="c:\build"
 hooks-path="c:\buildkite\hooks"
 plugins-path="c:\buildkite\plugins"
 git-clone-flags="-v --reference c:\buildkite\bazelbuild"