An Active File Mode Transition Mechanism Based on Directory Activation Ratio in File Synchronization Service

Round 1

Reviewer 1 Report

1.Some of the formatting of the manuscript needs to be changed, e.g. lines 483, 511-517.
2.Some charts could be clearer or more aesthetically pleasing, for example Figure 1 and Table 1.
3.The manuscript lacks a discussion section and the conclusion is not supported by the relevant references, which the author should have added.For example, when referring to existing models the author should give references
4.Some words in the main text should not be capitalized, e.g. lines 469-493.
5.The author could have used a clearer figure to show the results, e.g. Figure 9.
6.Overall, the manuscript is well structured but not well-written as many sentences are hard to understand. The overall language (English) of the manuscript needs to be thoroughly corrected. Various sentences are quite redundant and in fact repeat in some places.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

This paper presents an automatic approach for deciding, whether files of a cloud storage like dropbox are kept on the local device or will have to. be downloaded when being accessed. Existing service offer on-demand download which is controlled by the user.The technique introduced in the paper is based on the access history and provides appropriate control via thresholds on the local disk space management. 

It is quite surprising, that the cloud service do not provide such a feature already. Such algorithms are used in archieval systems that work as tertiary storage. If files are not accessed since a long time, they are automatically migrated into the archive storage. These copies might be stored on disk server farms or migrated to magnetic tapes by robot systems. 

Since the paper is well written and the evaluation presents convincing data for the overall working and the control of the system, I am inclined to accept the paper but only, if you extend the related work section witht he algorithms used in archival systems and argue for the novelty of your algorithm. 

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Thanks for your modifications. But, I think the related work can still be improved. Have a look at file caching in OS or prefetching in hierarchical storage. Amazon also offer such automation. I added three references to examples. Please investigate this further and add a substantial discussion to the related works. Also, please check the IEEE and ACM databases. 

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf

Round 3

Reviewer 2 Report

Thanks for taking the multi-tier storage system now into account and for comparing them to your work. Looks fine to me.