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2025-01-16 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Database >
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North Asia data recovery received a case of IBM DS 5300 storage data recovery:
IBM DS5300 full name (IBM System Storage DS5300) is a mid-range storage system launched by IBM. It has a well-designed and powerful internal architecture, which greatly improves performance, but some physical failures or other operations may cause damage to volumes or storage, so it has the opportunity to give full play to the data recovery technology of series storage. After these failures, we can only find a professional data recovery company to do data rescue work. The author recently dealt with a case in which storage was unavailable due to a disk failure in IBM DS5300, as shown below.
Fault description:
A public security bureau of an IBM DS5300 storage, a head, connected to four expansion cabinets, the bottom is 50 pieces of 600GB hard disk group RAID. Two groups of RAID5, one group of RAID crashed, this set of RAID consists of 27 600G hard drives, stored in Oracle database files, a total of 11 volumes in the upper layer of the storage system, the volume size is 1TB has 10, one is 4TB. Later, due to disk failure, the storage is unavailable and has been insured. Contact us for data recovery.
Hardware detection:
Our hardware engineers first tested the customer's 27 hard drives and found that the customer's 2 hard drives had bad tracks, and the error redundancy level of SMART had exceeded the threshold. 25 normal hard drives were fully mirrored, and 2 bad hard drives were restored with hardware tools and generated image files.
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Fault analysis:
First collect the IBM DS5300 storage log information. From the indicator light of the hard disk on the storage, we can see that there are two disks with yellow lights. Analyze the log information collected and the offline time of the two hard drives, so as to know that the data in that hard disk is up-to-date, and use the hard disk with the latest data for data recovery.
Solution:
Plan 1: mandatory online through IBM DS storage management software, backup all stored hard drives before mandatory online, and then forced online.
Scheme 2: through the analysis of the bottom data of the hard disk, RAID reorganization, extract data from the bottom, reload the oracle database, debug the upper application.
Implementation plan:
All the hard drives stored have been backed up, and problems can also be restored, so the first solution is first tested on the simulator, and then online on storage.
The raid is in a degraded state after being forced online by IBM DS storage management software. At this time, set up the hot spare and put it on top of the hot spare for data synchronization. After synchronization, the upper volume can be used directly, all the data can be seen, and the upper application can also be used normally.
The first solution saves a lot of time, and the upper application does not need to be debugged and can be started directly.
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The data was recovered successfully:
Because the upper volume can be used directly, so the data is visible, but for security reasons, we still copy all the files in the volume and hand them over to the customer. Finally, the data will be restored within the time required by the user. The whole recovery process took a total of 5 days. The reason why we can recover so quickly is that we have studied the storage principle of IBM DS5300 before. Once you know how IBM DS5300 is stored, all data disasters about it can be recovered.
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