Differences between ROW and COW of the OceanStor V3 Series

Publication Date:  2016-12-02 Views:  130 Downloads:  0
Issue Description
Differences between ROW and COW of the OceanStor V3 Series
Solution
Redirect-on-write (ROW) retains old data for snapshots. Unlike copy-on-write (COW), ROW uses one less write operation. However, for ROW, fragments are generated after data is read and written for a long period. As a result, consecutive spaces cannot be allocated to multiple sequential I/Os or the I/Os will become random. You can optimize the working mechanism by running fragment management in the background.

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