Intel IRP-TR-03-10 manual

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Table of contents for the manual

  • Page 1

    Integrating Portable and Distributed Storage N. Tolia, J. Harkes, M. Kozuch, M. Satyanarayanan IRP-TR-03-10 INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTI ON WITH INTEL® PRODUCTS. NO LICENSE, EXPRESS OR IMPL IED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERM[...]

  • Page 2

    Integrating P or table and Distrib uted Storage Niraj T olia †‡ , Jan Harkes † , Michael K ozuch ‡ , M. Saty anara y anan †‡ † Car negie Mellon Univ ersity , ‡ Intel Research Pittsburgh Abstract W e describe a technique called lookaside caching that combines the strengths of distributed file systems and portable storage de vices, w[...]

  • Page 3

    2 Background T o understand the continuing popularity of portable storage, it is useful to revie w the strengths and weak- nesses of portable storage and distributed file systems. While there is considerable variation in the designs of distributed file systems, there is also a substantial de- gree of commonality across them. Our discussion be- lo[...]

  • Page 4

    there should be no compromise of robustness, consis- tency or security . There should also be no added com- plexity in sharing and collaboration. Finally , the design should be tolerant of human error: improper use of the portable storage de vice (such as using the wrong de- vice or forgetting to cop y the latest version of a file to it) should no[...]

  • Page 5

    cfs lka --clear exclude all inde xes cfs lka +db1 include index db1 cfs lka -db1 exclude inde x db1 cfs lka --list print lookaside statistics Figure 1 . Lookaside Commands on Client at a specified pathname. It computes the SHA-1 hash of each file and enters the filename-hash pair into the index file, which is similar to a Berk eley DB database [...]

  • Page 6

    0% 20% 40% 60% 80% 100% 2 . 4 . 0 2 . 4 . 2 2 . 4 . 4 2 . 4 . 6 2 . 4 . 8 2 . 4. 10 2 . 4. 12 2 . 4. 14 2 . 4. 16 2 . 4. 18 2 . 4. 20 2 . 4. 22 2.4.0 2.4.1 2.4.2 2.4.3 2.4.4 2 .4.5 2.4.6 2.4.7 2.4.8 2.4.9 2.4.10 2.4.11 2.4.12 2.4.13 2 .4.14 2.4.15 2.4.16 2.4.17 2.4.18 2.4.19 2 .4.20 2.4.21 2.4.22 Each curve abov e corresponds to one minor version o[...]

  • Page 7

    Lookaside De vice State Bandwidth No Device 2.4.18 2.4.17 2.4.13 2.4.9 2.4.0 100 Mb/s 287.7 (5.6) 292.7 (6.4) 324.7 (16.4) 346.4 (6.9) 362.7 (3.4) 358.1 (7.7) [-1.7%] [-12.9%] [-20.4%] [-26.1%] [-24.5%] 10 Mb/s 388.4 (12.9) 282.9 (8.3) 364.8 (12.4) 402.7 (2.3) 410.9 (2.1) 421.1 (12.8) [27.1%] [6.1%] [-3.7%] [-5.8%] [-8.4%] 1 Mb/s 1148.3 (6.9) 424.8[...]

  • Page 8

    suspend. 1 Lookaside caching can then reduce the per- formance ov erhead of cache misses at the resume site. A dif ferent use of lookaside caching for ISR is based on the observ ation that there is often substantial commonality in VM state across users. For example, the installed code for applications such as Microsoft Of fice is likely to be the [...]

  • Page 9

    No With Lookaside Lookaside Win 100 Mb/s 14 (0.5) 13 (2.2) 7.1% 10 Mb/s 39 (0.4) 12 (0.5) 69.2% 1 Mb/s 317 (0.3) 12 (0.3) 96.2% 100 Kb/s 4301 (0.6) 12 (0.1) 99.7% This table sho ws the resume latency (in seconds) for the CD A benchmark at different bandwidths, with and without looka- side to a USB flash memor y ke ychain. Each data point is the me[...]

  • Page 10

    Lookaside De vice State T race Bandwidth No De vice 100% 66% 33% 100 Mb/s 50.1 (2.6) 53.1 (2.4) 50.5 (3.1) 48.8 (1.9) Purcell 10 Mb/s 61.2 (2.0) 55.0 (6.5) 56.5 (2.9) 56.6 (4.6) 1 Mb/s 292.8 (4.1) 178.4 (3.1) 223.5 (1.8) 254.2 (2.0) 100 Kb/s 2828.7 (28.0) 1343.0 (0.7) 2072.1 (30.8) 2404.6 (16.3) 100 Mb/s 26.4 (1.6) 31.8 (0.9) 29.8 (0.9) 27.9 (0.8) [...]

  • Page 11

    No With Lookaside Lookaside Win 100 Mb/s 173 (9) 103 (3.9) 40.1% 10 Mb/s 370 (14) 163 (2.9) 55.9% 1 Mb/s 2688 (39) 899 (26.4) 66.6% 100 Kb/s 30531 (1490) 8567 (463.9) 71.9% This table giv es the total operation latency (in seconds) f or the CD A benchmark of Section 5.2 at different bandwidths , with and without lookaside to a LAN-attached CAS prov[...]

  • Page 12

    possessed by portable devices, while simultaneously preserving the consistency , rob ustness and ease of shar- ing/collaboration provided by distrib uted file systems. One can en vision man y extensions to lookaside caching. For example, the client cache manager could track portable de vice state and update stale files auto- matically . This woul[...]

  • Page 13

    No Lookaside With Lookaside 0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000% Operations Sorted by Slowdown Slowdown 0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000% Operations Sorted by Slowdown Slowdown (a) 100 Mb/s 0% 100% 200% 300% 400% 500% 600% 700% 800% 900% 1000% Operations Sorted by Slowdown Slowdown 0% 100% 200% 300% 400% 500% 60[...]