As the demand of mass storage system rises in recent years, the market is
looking for the storage media that has higher areal density. To increase the
areal density, new technologies have been proposed such as shingled mag-
netic recording(SMR) and interlaced magnetic recording(IMR). To further
increase the space of storage system, a technology named redundant array of
independent disks 5 (RAID 5) is used to take the benets from multiple disks
storage system. RAID 5 utilizes data striping to improve the access speed
and utilizes parity data to protect the system from one disk failure. Several
previous papers have studied the potential of appplying SMRs to RAID 5.
However, it shows that the solution provides bad access performance due to
the costly RMW operation in SMR. In this paper, we propose our method
named IMRAID5 to combine IMRs with RAID 5. To our best knowledge,
we are the rst one to propose the solution of applying RAID 5 to IMR.
Comparing to SMR, IMR has two advantages. First, a big portion of tracks
can be freely rewritten without resulting in RMW operations. Second, the
RMW overhead is xed and much smaller. Based on these two advantages,
we expect the performance of RAID 5 IMR would be better than RAID 5
SMR. Besides, IMRAID5 adopts two new technologies named virtual frame
and top cache to help reduce the chances of RMW operation. These methods
further improve the access performance of RAID 5 IMR. According to our
experiment results, comparing to the baseline, IMRAID5 can decrease the
frequency of RMW operations as well as the write latency 102 to 103 times
on average.

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