Collective sleepless night IBM AIX JFS2 file system OA system data accidental deletion

In the late night of July 20th, 2010, a group of busy technical engineers worked in a telecommunications room in Chengdu for two days and one night, but everyone did not feel sleepy. They were still nervously staring at the screen of this IBM minicomputer. Since the data on the IBM AIX minicomputer was accidentally deleted on Saturday, dozens of people in the information center were extremely nervous. Not only did they bring in system-level senior experts from IBM, but also found several data security. Experts come to help find a way. However, things did not develop in the expected direction, and there was no progress in AIX data recovery.

Figure 1: Dash expert IBM AIX JFS2 file system data recovery experience

On the morning of July 21, Director Zhang, who had not slept for two days and two nights, called everyone to discuss and finally decided to seek help from the data recovery company. At noon, engineers from two local data recovery centers in Chengdu arrived at the scene to understand the situation. In the face of the IBM AIX system, there was basically no way to start, and the conclusion that data recovery could not be performed was quickly given. Director Zhang believes that the small machine of the IBM AIX system is an enterprise-class high-end storage device. It is very difficult to find a real expert in Chengdu. It must be aimed at the whole country. After Director Zhang communicated with the leaders of the superior company, three data recovery companies in Beijing, Shanghai and Guangzhou entered the line of Director Zhang. Engineers wrote the site as technical documents and sent them to the three companies, and asked for a detailed solution for IBM AIX data recovery within 2 hours. The solution requirements must ensure the security of data and the success rate of data recovery.

In the end, the feasibility of the Beijing Darth Data Recovery Center solution was affirmed by the information center. Director Zhang said that the solution from Darth Data Recovery shows that they have rich experience in IBM AIX data recovery and Technology accumulation.

Darth data recovery experts take the IBM AIX data recovery technology

On the afternoon of July 21, the two parties quickly signed a data recovery commission contract. At 21:00, two people from Das Data Recovery Experts boarded the flight from Air China to Chengdu.

As the air control plane was late, at 2 am on the 22nd, Das data recovery experts went to Chengdu Shuangliu Airport. Xiaopan of the information center had been waiting at the airport for more than three hours. Everyone rushed to the engine room.

In the machine room meeting room, Dash Data Recovery experts learned more about the process of data loss and the operations that followed, and then immediately invested in data recovery.

Operating environment: The IBM minicomputer runs the IBM Lotus Notes/Domino office system.

Failure time: Saturday, July 17, 2010

The detailed process of misoperation: Lotus Notes office system data (Domino's .nsf file) is stored on the storage array. The information center engineers intend to organize and migrate the data, and clear some data that is considered unimportant on the Lotus Notes client. No abnormalities were found at the time, and the client did not write data. On Monday, July 19, 2010, many people went to work. Everyone used to turn on the computer, but many users could not log in to the OA system. The information center's phone was blown up in just 10 minutes. The information center immediately became messy. In a group, I realized that I had mistakenly deleted the important database during the overtime work on Saturday! Soon, I was alarmed by the leadership of the group company. The impact of this data loss is quite serious.

Darth data recovery experts believe that the architecture of this case is that Lotus Notes runs multiple units of OA system, even if there is a problem with one unit of OA, it can not be down, if the downtime will affect the normal use of other OA. In this case, the storage will have new data writes, which increases the many uncertainties of data recovery, and the difficulty is evident.

When the Darth data recovery expert signs the data recovery commission contract, the remote guidance information center engineer can back up the accidentally deleted file system to another storage through the dd command under UNIX without stopping the machine, which can reduce the number of files. A lot of new data is written to the file system to be restored, and the files that are backed up are processed in the subsequent data recovery operations.

The Darth data recovery expert found that the dd operation that was done before was completed and was a 112GB image file. After nearly 10 hours of analysis, at noon on the 22nd, the relevant data was extracted according to the customer's request. After the customer verified, the recovered files were correct, but the data records were only in June, and there was no data in July. After on-the-spot discussion, the customer guessed that the data might be on another file system of 200GB size, so the engineer analyzed the image file of the 200GB file system, and recovered the file deleted by the customer in the 200GB file system. It is already late at night on the 22nd.

Darth Data Recovery Expert Analyzes IBM AIX JFS2 File System Data Recovery Technology

1, in the UINX file system, all files and directories are described by inode, inode can be regarded as the soul of files and directories. In the JFS2 file system, the inode size usually takes 512 bytes. The inode contains the most important information: inode number, file or directory size, file attributes (permissions, etc.), four times (last data accessed, last status changed) , last data modified, created), data pointers, inode connections, etc.

2. According to the JFS2 file system architecture, all inodes of a file system are similar to ordinary files. According to the requirements of the allocation space, we can extract all the inodes of a file system, save them as a file, and analyze the file as needed.

3. In the JFS2 file system, when a file or directory is deleted, the file or directory name is not changed, and the inode information of the file does not change greatly. Usually, the time is updated and the number of inode connections is updated to 0 ( The number of inode connections refers to how many files share the inode, an inode can be used for multiple files, but a file can only correspond to one inode. Other information generally does not change, the most important of which is that the data pointer has not changed. This is the possibility to recover after deleting the file.

Editor's note: Dash experts staged the airborne national service medicine to the disease

In fact, in recent years, Darth's data recovery experts have traveled almost all over the country. It can be said that the Darth data recovery expert has become the closest partner of the information center of enterprises and institutions.

On May 17, 2008, Darth data recovery experts went to the CGN Dalian Nuclear Power Plant to solve the DELL server data recovery problem, which lasted 2 days;

On June 4, 2008, Darth data recovery experts went to Guiyang Mobile to solve the problem of IBM AIX JFS2 file system mis-delete data recovery, which lasted 4 days;

On July 25, 2008, Darth data recovery experts went to Shijiazhuang Construction Bank of Hebei Province to solve the data recovery problem of HP DL3850G5 server, which lasted 8 hours;

On September 15, 2008, Darth data recovery experts went to Tianjin Surveying and Mapping Bureau to solve the problem of HP server disk array data recovery, which lasted for 5 hours;

On May 17, 2009, Darth data recovery experts went to the Ping An Shanghai Data Center in China to solve the problem of deleting the mail system of 108 HP storage devices ReiserFS system, which lasted for 4 months;

On June 22, 2009, Darth data recovery experts went to the State Grid Tibet Lhasa Power Company to solve the data recovery problem of HP virtual storage disk array, which lasted 12 days;

On October 19, 2009, Darth data recovery experts went to the IBM AIX minicomputer Oracle database repair problem of Sinopec Lanzhou Branch, which lasted for 3 days;

On March 17, 2010, Darth data recovery experts went to the door service of Beijing Airlink Tietong machine room to solve the problem of accidental deletion of Linux Ext3 file system and Oracle database repair problem, which lasted for 5 days;

On April 6, 2010, Das data recovery experts came to Beijing Sony Ericsson to solve the problem of mis-delete the Sun Solaris UFS file system for 4 days.

. . . . . .

Darth Data Recovery has become a security expert in enterprise IT information centers, building a strong Great Wall on the last line of data security.

Das Data Recovery Expert Team will release UNIX data recovery software products

At the request of the majority of enterprise users, the Darth Technology R&D team will launch an enterprise-class top-level data recovery software that supports multiple UNIX and Linux operating systems. This software can be said to be a huge file system support. Full support for Ext2, Ext3, Ext4, JFS, JFS2, ReiserFS, etc. In addition, the Darth Data Recovery R&D team plans to add UFS, XFS, VxFS, CFS and other file systems in the near future. Linux file system data recovery is more luxurious.

About Darth Technology

Darth Technology is a well-known brand in the data recovery industry and has a high reputation in the country and even in Asia. The advantage of Darth Technology is the in-depth study of data recovery technology, especially in the data recovery of Unix and Linux large storage devices (including EXT3 file system deletion data, UFS file system data recovery, IBM-AIX data recovery and other high-end technologies). , has a more obvious advantage.

Dasi Technology has launched D-Recovery, the first data recovery software with independent intellectual property rights, in the civilian market. It is the best data recovery software to date. Darth Technology is a company with independent research and development capabilities for data recovery technology, and has strong advantages in data recovery outsourcing services. Darth Data Recovery provides data recovery outsourcing services for many Fortune 500 companies, such as China HP. Accenture, Siemens, PetroChina, BASF, Industrial and Commercial Bank of China, Baidu, etc. Dasi Technology has a domestic leading data recovery laboratory, the first local ten-level clean room, server data recovery workstation, hard disk repair base, data recovery training base, U disk mobile data recovery platform, etc., for the development of domestic data recovery technology. Played a positive role in promoting.

In addition, Dakai Software's Dakai Software represents many of the world's best data recovery hardware and software tools and equipment, such as: Finaldata, EasyRecovery, R-Studio, PC3000, HRT, HD Duplicator, Winhex and so on.

Experts warmly remind you how to choose a data recovery company?

The Data Recovery Expert Team of Darth Technology solemnly reminds you that it is most important to find data recovery. When important data is lost, don't panic, and you can't just find a service provider to perform data recovery operations. The best way is to find reliable people and people who know the relevant business to help find the data recovery company. Otherwise, call several companies to ask, especially the details of some data recovery, the formal data recovery company will be in the details Very experienced. Darth Technology data recovery experts reminded that the data recovery company's choice should be in place, find the most professional company, data recovery is more secure!

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