Shulou(Shulou.com)05/31 Report--

Today, I would like to share with you the relevant knowledge of what is the method of data recovery from common failures in raid5. The content is detailed and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article.

Repair of server raid array failure

One is a HP LH6000 server purchased in 2000, four 18GB hard drives are made into RAID5 disk arrays, the other is NetRaid;, the other is a HP ProLian civilization 370 server purchased in 2006, and four 146GB hard drives are made into RAID5 disk arrays, with Smart Array 642 cards and hot backup hard drives (Hot Spare). Both operating systems are Window 2000 and the database is Server 2000.

The malfunction of HP LH6000 is as follows: one hard disk is flashing red light, the machine is still running normally, but it is not long before the system is not working properly, then it is found that the red light of another hard disk is also flashing.

Raid disk array data recovery method:

Start the server and press Ctrl+M to enter the NetRaid hypervisor when self-testing to the array. Check the array information and find that the status of the hard disk is Failed, and use the modified configuration to forcibly set a hard disk to OnLine. Restart the server, which is invalid during the hardware self-test before entering the system and failed to start.

Start the server and press Ctrl+M to enter the NetRaid hypervisor when self-testing to the array. Select the disk array, manually Fail the hard disk hanging from the original OnLine, and then manually set another Failed hard disk to OnLine, and restart the server to enter the system.

After checking that the system and database are running normally, the Array configuration tool manually sets the Failed hard disk to Rebuild,100% and then restarts the server, and all the arrays and systems are restored.

The author works on another server running ERP system (HP ProLiant language 370). Four 146GB hot-swappable hard drives are configured into a disk array with RAID level 5 through raid cards (Smart array array cards). One of the hard drives suddenly failed during operation. Server RAID 5 automatically enables hot backup hard drives (Hot Spare) to logically replace damaged hard drives. The data access task of the entire hard disk is still running intact in the original read-write program column, and the application and database are not affected.

Check the status of the hard drive through the ACU tool included with HP and find that the hard drive warned by the red light is offline. If two hard drives of Raid 5 in the HP ProLiant server show a red light, the system has crashed and the database cannot be accessed, but the system will not shut down automatically. When the second hard drive turns on the red light, the data can not be recovered by conventional means, so we can only pay to find a professional third-party data recovery company to recover the data.

Therefore, for HP's old HP LH6000 series servers, the design of the array is quite different from the current HP ProLiant series server array. As far as the operation method is concerned, the array operation method of the HP LH6000 server has many options, including the ability to delete the array and rebuild it after the array failure, and the initialization is also selected manually. However, the initialization of the HP ProLiant series server array is automatically performed in the background after configuring the array, so the ProLiant series servers cannot reconfigure the array after the array error.

These are all the contents of this article entitled "what is the method of data recovery from common failures in raid5?" 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.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.