Shulou(Shulou.com)06/02 Report--

[description of data recovery failure]

The customer server belongs to the HP brand DL380 series. The storage is a RAID5 composed of 6 73GB SAS hard drives, and the operating system is WINDOWS 2003 SERVER, which is mainly used as a file server within the enterprise department. The host (without UPS) experienced several unexpected power outages before the failure, and RAID reported an error after restart, indicating that the storage device could not be found. After entering the RAID management module, the operation crashed, and the problem remained after restart. Users contact our company and bring the equipment to our company.

[data recovery failure analysis]

It is not uncommon for RAID modules to be damaged (including RAID management information loss and RAID module hardware damage) caused by accidental power outage of the mainframe. Generally speaking, after the creation of RAID, the information of its management module will not be changed, but after all, this information is modifiable. Accidental power outages can easily cause this information to be tampered with or even lost, and multiple power outages may even lead to damage to the components on the raid card. As a result, the host loses the middle layer module for RAID management of multiple physical hard disks. In this case, the operation crash of the RAID module is most likely caused by the raid card hardware damage (later verified by the HP after-sales technical staff). At this time, it is impossible to obtain the data in the 6 hard drives through the normal way, and can only rely on the third party to provide data recovery services to solve.

[data recovery process]

1. First of all, a strict physical test is carried out on the six SAS hard drives provided by the user, and the reading status of the six hard drives is good.

two。 Mirror 6 hard disks in the user failure RAID group respectively. In order to ensure absolute data security, the target storage is array storage with redundant function.

3. After the mirror image is completed, the RAID structure of the 6 backup files is analyzed, and the disk order, block size and verification mode of the 6 hard disks are determined according to the file system storage rules, and the RAID group is reconstructed in the virtual environment.

4. After logically checking the data in the constructed RAID to ensure that the parameters applied in the refactoring RAID are correct, complete verification is carried out against the data that users are most concerned about.

5. After the user confirms that the data recovery result has fully reached the expected (the data is restored to the pre-failure state), all the user business data are migrated to the user storage, and the data recovery is complete.

[server storage security recommendations]

1. Try to ensure a stable power supply in the computer room, so as to reduce the impact of abnormal power supply on the host and storage

two。 It is best to configure UPS for important servers and storage, which can ensure that the core business system can continue to work normally for a certain period of time in case of accidental power outage in the computer room, thus winning valuable time for enterprises to seek emergency solutions.

3. The security status of the server that has been in service for a long time should be checked regularly, and its overall operation status should be evaluated to determine whether to upgrade the hardware and system comprehensively, and to formulate an emergency plan to deal with sudden data disasters in advance to reduce business losses caused by data disasters.

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