Flexibly combining mirroring, concatenation and striping in virtual storage devices

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...

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Bibliographic Details
Main Author KARR RONALD S
Format Patent
LanguageEnglish
Published 14.07.2009
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary: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.
Bibliography:Application Number: US20070865033