[Best use of DrivePool + Snapraid: replace a drive]

This method worked for me:

• Connect and format new drive
• Add drive to drivepool to create poolpart folder
• stop both services (snapraid and drive pool)
• robocopy data from old drive pool to new drive pool folder
  •     robocopy F:\PoolPart.xxxx K:\PoolPart.yyyy /e /copyall
• copy snapraid.content file if applicable
• edit snapraid conf
  •     comment out (#) old data disk line (e.g. "data dx F:\PoolPart.xxxx" becomes "#data dx F:\PoolPart.xxxx"
  •     add new data disk line using old "dx" with new drive letter and poolpart folder (e.g. "data dx K:\PoolPart.yyyy")
  •     update content line if applicable
• run snapraid service
  •     run a diff and fix potential changes until "diff" reports only "equal", "restored" or "copied" files.
    •         snapraid diff
  •     run a "check" audit command limited to the replaced disk to check the check-sum of all the files (replace "DISK_NAME" with "dx")
    •         snapraid check -a -d DISK_NAME
  •     once everything seems ok, run a sync which should be immediate
    •         snapraid sync
• run drive pool service