Case:
The original storage architecture of the customer is a dynamic cross -zone volume made by 7 LUN (each LUN2TB). The file system is a NTFS partition with 7 LUN capacity.Due to the needs of data storage, customers are dynamically expanding the existing file system. The original plans to add two 2TB LUNs. During the expansion process, the system stopped response and downtime.After restarting the system, it was found that the expansion failed. Moreover, the original 7 LUN became a basic disk (the cross -zone volume was a dynamic disk), and the file system partition logo was lost.Customers are seeking its system service providers and Microsoft system engineers on -site maintenance. Microsoft engineers test all the underlying structures of Lun’s underlying structures and cannot be repaired. Microsoft engineers have given up repair.Customers find the data recovery center for data recovery operations when they seek invalid support in multiple parties.
Solution:
After signing a confidentiality agreement and service agreement, the engineer of the Data Recovery Center entered the customer’s site. The initial analysis of the fault LUN found that there were a large amount of data at the bottom layer of these 7 LUNs, and there was a problem with the LDM database used across the region. When analyzing the NTFS file system, it was found that the total capacity of NTFS became the capacity of the original 7 LUN+2TB. MFT has local fragments. Preliminary evaluation, the chance of data recovery and integrity is expected to be above 99%. 1.lun backup. In order to ensure the absolute security of the source data, the primitive 7 LUN first completes the physical mirror image one by one. After 1.5 working days, complete the image of all LUNs, and the subsequent recovery operation is completed on the LUN of the image. Data Security. 2. Data recovery center engineer analysis mirror Lun’s bottom layer found that the data accounted for almost the capacity of the entire file system 12TB, analyzing about 5.9 million files and directory at the bottom. 3. Manually analyze LDM and MFT, and determine the LUN disk to stop the sector (LBA) for reorganization file systems. 4. After analyzing LUN1, LUN2, LUN3, LUN4, it was found that the four LUNs were the same, but the subsequent LUN5 and LUN6 were inconsistent, and LUN7 and LUN1/2/3 were the same. 5. The engineer wrote the program on -site, re -detect the LUN4/5/6 bottom LBA, and finally determine the correct start and end LBA. 6. Reorganize and resolve dynamic volumes. 7. Data export. In this work, the customer first prepared a intact 16TB dynamic volume, and all export data were exported to the intact dynamic volume. 8. Customer verification data, 100%complete and effective.