Table of Contents

SnapRAID - Disks - Replace a data disk in an existing array

If the data disk is lost, see the recovering section in the manual.

Copy all files to the new disk

Copy all the files to the new disk, maintaining the same directory structure and names. 

cp -av /from_dir/. /to_dir

WARNING: Some other mechanisms to copy the files, such as rsync may be problematic, especially if using older versions of these alternative commands.

  • Older versions are not able to copy the sub-second timestamps.

Change the SnapRAID configuration

Change the SnapRAID configuration to point the disk at the new mount point and run a “diff” command to ensure that everything is placed correctly. 

snapraid diff

NOTE: If “diff” reports some “added” or “removed” files, it is likely the files have been copied with a different directory structure.

  • In such case, fix it, until “diff” reports only “equal”, “restored” or “copied” files.

Check that the files were really copied correctly

Run a “check” audit command limited to the replaced disk to check the check-sum of all the files. 

snapraid check -a -d DISK_NAME

Update the SnapRAID state

Run “sync” to update the SnapRAID state. 

snapraid sync