Flexibly combining mirroring, concatenation and striping in...

Details Flexibly combining mirroring, concatenation and striping in... Flexibly combining mirroring, concatenation and striping in...

2004-12-07

2008-10-07

Wilson, Yolanda L (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C711S114000

Reexamination Certificate

active

07434091

ABSTRACT:
A volume server for flexibly combining mirroring, striping and concatenation in virtual storage devices includes virtualization functionality and a layout table. The virtualization functionality may be configured to aggregate storage within one or more block devices into a logical volume. The layout table may include multiple extent entries, where each extent entry represents a mapping of an extent of block device storage to a virtual address range of the logical volume, including an indication of a stripe of the logical volume to which the extent is mapped. An overlap in virtual address range between a first and a second extent entry may indicate mirroring of the overlapping blocks at each extent. In response to a storage request, the virtualization functionality may obtain a block device address corresponding to the logical volume virtual address of the storage request from the layout table.

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“Veritas Storage Foundation™ Technical Overview,” Veritas Software Corporation, pp. 1-37, Apr. 2002.

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