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2025-01-17 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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Today, I would like to share with you the relevant knowledge about how to recover Raid5 disk array data. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.
[disk array data recovery failure description]
One of the customer's servers, the server uses a hp smart array controller to mount a domestic disk array, which consists of 14 146g SCSI hard drives to form a set of RAID5. The operating system is LINUX, and NFS+FTP is built to be used as the company's internal file server.
Due to the relocation of the server room, the administrator cleaned the server and disk array equipment during the relocation, and then the server could not recognize the RAID after the new computer room was connected to the line and did not initialize it.
[disk array preliminary check results]
After a simple initial inspection of the equipment, the engineer found that the reason for the data loss was the loss of raid information, the HP smart array series controller originated from Compaq, and the redundancy in RAID was checked by double cycles.
[raid data recovery steps]
1. Connect the SCSI hard disk cabinet directly to the SCSI expansion card that does not contain RAID function.
2. Then the engineers connect all the hard drives in the server array in a single disk on a dedicated (modified windows2003) repair platform.
3. In order to protect the customer's original data and avoid changing the customer's original data due to the data recovery operation, all hard drives must be fully mirrored in a read-only manner during all data recovery processes, and the images are also stored on devices with redundancy protection.
4. Arrange engineers to analyze the double-loop check parameters of the original RAID from the image file, and build a virtual raid platform.
5. Remove the offline disk on the virtual RAID platform and explain the file system. At this time, you can export raid data.
6. Connect the disk array on the customer's original HP server and reconfigure RAID.
7. Finally, all the data is transmitted back to the newly-built raid disk array through network dd, NFS, SAMBA, FTP, SSH and other data transmission methods.
[data recovery results]
All the data in the Raid was successfully restored, and all the work took 2 days.
[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.
These are all the contents of the article "how to recover Raid5 disk Array data". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.
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