Abstract
A ZFS based software raid system was tested for performance against a hardware raid system providing storage based on the traditional Linux file systems XFS and EXT4. These tests were done for a healthy raid array as well as for a degraded raid array and during the rebuild of a raid array. It was found that ZFS performs better in almost all test scenarios. In addition, distinct features of ZFS were tested for WLCG data storage use, like compression and higher raid levels with triple redundancy information. The long term reliability was observed after converting all production storage servers at the Edinburgh WLCG Tier-2 site to ZFS, resulting in about 1.2PB of ZFS based storage at this site.
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