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This paper presents the design and implementation of a host-based driver (a " volume manager ") for a 3-tier RAID storage system, currently with 3 tiers: a small RAID1 tier and larger RAID5 and compressed RAID5 (cRAID5) tiers. Based on access patterns (" temperature "), the driver automatically migrates frequently ac-cessed data to RAID1 while demoting not(More)
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