WO1999060564A3 - Caching method for data blocks of variable size - Google Patents

Caching method for data blocks of variable size Download PDF

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Publication number
WO1999060564A3
WO1999060564A3 PCT/US1999/010536 US9910536W WO9960564A3 WO 1999060564 A3 WO1999060564 A3 WO 1999060564A3 US 9910536 W US9910536 W US 9910536W WO 9960564 A3 WO9960564 A3 WO 9960564A3
Authority
WO
WIPO (PCT)
Prior art keywords
data block
cache
size
caching method
block
Prior art date
Application number
PCT/US1999/010536
Other languages
French (fr)
Other versions
WO1999060564A2 (en
Inventor
Richard J Defouw
Alan Sutton
Ronald W Korngiebel
Original Assignee
Storage Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Storage Technology Corp filed Critical Storage Technology Corp
Priority to EP99921940A priority Critical patent/EP1095373A2/en
Priority to JP2000550099A priority patent/JP2002516446A/en
Publication of WO1999060564A2 publication Critical patent/WO1999060564A2/en
Publication of WO1999060564A3 publication Critical patent/WO1999060564A3/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
    • G06F12/12—Replacement control
    • G06F12/121—Replacement control using replacement algorithms
    • G06F12/122—Replacement control using replacement algorithms of the least frequently used [LFU] type, e.g. with individual count value

Abstract

A caching method (30) for selecting variable size data blocks for removal from a cache (14) for a virtual tape subsystem (10) or other cached system of computer data storage includes determining (32, 34) the size and the unreferenced time interval of each data block in the cache. The size of a data block is the amount of cache space taken up by the block. The unreferenced time interval of a data block is the time that has elapsed since the block was last accessed. The recall probability per unit time of each data block in the cache is then determined (38). The recall probability of a data block is a function of its unreferenced time interval and possibly size and other auxiliary parameters. The caching method then determines (40) a quality factor (q) for each data block. The quality factor (q) of a data block is a function of its recall probability and size. The caching method concludes with removing (42) from the cache the data block with the lowest quality factor (q).
PCT/US1999/010536 1998-05-15 1999-05-12 Caching method for data blocks of variable size WO1999060564A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP99921940A EP1095373A2 (en) 1998-05-15 1999-05-12 Caching method for data blocks of variable size
JP2000550099A JP2002516446A (en) 1998-05-15 1999-05-12 How to cache variable-size data blocks

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7987998A 1998-05-15 1998-05-15
US09/079,879 1998-05-15

Publications (2)

Publication Number Publication Date
WO1999060564A2 WO1999060564A2 (en) 1999-11-25
WO1999060564A3 true WO1999060564A3 (en) 2000-02-24

Family

ID=22153397

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/010536 WO1999060564A2 (en) 1998-05-15 1999-05-12 Caching method for data blocks of variable size

Country Status (4)

Country Link
US (1) US6742084B1 (en)
EP (1) EP1095373A2 (en)
JP (1) JP2002516446A (en)
WO (1) WO1999060564A2 (en)

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US7913011B2 (en) * 2009-01-02 2011-03-22 The Boeing Company Method and apparatus for employing a second bus controller on a data bus having a first bus controller
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Also Published As

Publication number Publication date
US6742084B1 (en) 2004-05-25
WO1999060564A2 (en) 1999-11-25
EP1095373A2 (en) 2001-05-02
JP2002516446A (en) 2002-06-04

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