Methods and structure for improved import/export of raid...

Details Methods and structure for improved import/export of raid... Methods and structure for improved import/export of raid...

2005-12-19

2008-08-26

Verbrugge, Kevin (Department: 2189)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S170000

Reexamination Certificate

active

07418550

ABSTRACT:
Methods and structure for improved import of RAID level 6 logical volumes into subsystems devoid of RAID level 6 hardware support. When a RAID level 6 logical volume is exported from a first storage subsystem and imported into a second storage subsystem devoid of RAID level 6 hardware support, features and aspects hereof first migrate the logical volume for use as a logical volume with a different RAID level supported by the second storage subsystem. The migration may be, for example, to a RAID level 5 logical volume performed by movement of data blocks to form new stripes and re-generation of associated parity blocks or by simpler re-mapping of existing blocks of the RAID level 6 volume to use only blocks and parity needed for RAID level 5 management. Further features and aspects allow migration to any other RAID management level supported by the second storage subsystem.

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