Case:
A old IBM tower PC Server uses four 146G SAS hard disks to create RAID, RAID cards create two RAID levels in the disk, the front is RAID1, which is used to install the system. The RAID5 is used as another other.Logic partition is used, users only say that the system can only be from the system
Solution:
The engineer disassembled the hard disk and made a mirror of the hard disk.In the process of mirroring, there were two dish stages of different degrees of disks. For the hard disk with bad sectors, we switched to PC3000 for UDMA for mirror operation.Analyze the underlying structure, and it is found that two disks with bad sectors have been created by the RAID card as RAID1 since the 0 sector, which means that the server uses two plates of them to create the RAID1 to install the system, and the rest remains.The starting sector structure of the two plates is RAID5. The two disks are created with RAID5 as logical partitions with the remaining sectors behind the two plates containing RAID1.Establish RAID, use the software developed independently, and locate the same RAID -level sector address in the hard disk to virtually build RAID, and finally restore user data.
