VPS误写入Ubuntu ISO致数据丢失后的恢复方案咨询

Hi Jani, sorry to hear about this frustrating mix-up with your VPS. Let’s walk through practical steps to recover your data, including how to use testdisk since you mentioned it, plus some key precautions to avoid making things worse.

• First, pause any unnecessary disk writes immediately
  The most critical rule for data recovery: don’t write anything new to the affected disk. Every new write overwrites sectors that might still hold your old data. If your GParted scan is running, you can let it finish, but if it’s dragging on for too long, testdisk is often faster and more targeted for partition table recovery.

• Using testdisk (step-by-step for your scenario)
  testdisk is a powerful, free tool built to recover lost partitions and fix boot issues—ideal for your case, since the fast ISO copy likely only overwrote the partition table or a small portion of the filesystem, not the entire 2.5TB disk. Here’s how to use it:

  1. Install it first (if not already on your VPS):

     sudo apt update && sudo apt install testdisk
     

  2. Launch it with root privileges:

     sudo testdisk
     

  3. Select Create to generate a new log file (this helps with troubleshooting if you hit snags later).
  4. Choose your affected 2.5TB disk (look for labels like /dev/sda—double-check the size to avoid picking the wrong one).
  5. Select the partition table type: most VPS use Intel/PC partition (go with this unless you know your system uses GPT).
  6. Pick Analyze to start scanning for lost partitions.
  7. Run Quick Search first—it’s fast and will likely find your old partitions if they weren’t fully overwritten:
     • If it locates your missing partitions, select one and press P to preview its files. If you can see your data, you’re on the right track!
     • Press Write to restore the partition table, confirm when prompted, then reboot your VPS. Your data should reappear.
  8. If Quick Search comes up empty, try Deep Search—it’s slower but scans every sector for partition signatures, which might find remnants of your old filesystem.

• Alternative: Clone the disk first (if you have extra storage)
  If you have access to another disk or remote storage, clone the affected disk before starting any recovery steps. This creates a backup, so if something goes wrong, you can start over from the clone. Use ddrescue for a reliable clone:

  sudo ddrescue /dev/sda /path/to/clone/disk.img /path/to/recovery-log.log
  

  Then run testdisk on the cloned image instead of the original disk.

• Last resort: Professional recovery services
  If both GParted and testdisk fail, and your data is extremely critical, check if your VPS provider offers paid data recovery services. This is costly, but it’s an option for high-value data.

备注：内容来源于stack exchange，提问作者Jani