Quote: a file system should be high performance, robust against some software errors, and use available hardware [»hagmR_1987]

Quote: storage capacity doubles every year while access time improves at 10% per year; increasingly difficult to extract data [»grayJ6_2003]

Quote: transfer huge databases by transfering complete computers [»grayJ6_2003]

Quote: error rates have remained constant while capacity and bandwidth have increased tremendously [»browD9_2007]

Quote: Star file drawers correspond to a shared file server with access rights [»smitDC_1982]

Quote: use a file system instead of cards and tape for on-line interaction; device independent, unlimited storage, symbolic addresses [»daleRC_1965]

Quote: file system implemented in Multics [»daleRC_1965]

Note: a file system or database is global state accessed by name [»cbb_2000, OK]

Quote: DSEE's Domain/OS manages files by their type; a type implements one or more traits of related operations; e.g., the protection trait [»lubkD6_1991]

Quote: a database does not see files as character arrays; perhaps database functions should be the low level facility [»stonM7_1981]

Quote: performance analysis of prefetching; significant gains from disk caching, I/O amortization, seek time reduction, and overlapped computation and I/O [»shriE6_1999]

Quote: file system model predicted response time within 9% error; simplified analysis of prefetching [»shriE6_1999]

Quote: read the entire cluster when reading a disk block [»shriE6_1999]

Quote: treat file storage like memory; plug in disks as needed; allocate and release space from a storage pool [»browD9_2007]

Quote: allocate a disk cache segment for each concurrent process accessing a file [»shriE6_1999]

Quote: all free pages kept in OS6's free storage file, in cache memory, and on backup disk [»stoyJE3_1972]

Quote: a page's label (file id etc) is always checked before writing; only written when freed or defined [»lampBW4_1974]

Quote: UNIX partitions disks into cylinder groups with copy of superblock, local inodes, free block bit map, and usage statistics [»mckuMK8_1984]

Quote: rebuilding reads all the labels, gets full names for all files, gets free pages, checks directories; takes 30 seconds [»lampBW4_1974]

Quote: the bit table for free disk pages is a hint, verified against the label of the free page [»lampBW10_1983]

Quote: free disk bit map for UNIX at fragment level, but blocks are aligned [»mckuMK8_1984]

Quote: large-scale study of 10,000 Windows file systems at Microsoft [»doucJR5_1999]

Quote: if exclude system files, 99.5% of all changes to a file are by the previous writer [»kistJJ2_1992]

Quote: if exclude system files, the chance of different users modifying the same object within a week is less than 0.4%

Quote: file sizes are log-normal across file systems; 4 KB median by frequency, 2 MB median by size, 64-128 KB mean file size, correlated with extension [»doucJR5_1999]

Quote: median directory size is 2 files with 18% containing no files [»doucJR5_1999]

Quote: 69% of all directories have no subdirectories, 16% with one subdirectory, 15% at depth of 8 or greater

Quote: median file age of 48 days, excluding the vast majority of short-lived files [»doucJR5_1999]

Quote: 44% of files never used; of those used, median lifetime is 12 days of use; varies by job, e.g., tech support vs. admin

Quote: each major client of a file server needs a charging capability to account for file creation and storage [»birrAD9_1980]

Quote: can associate an access list with each object that gives access codes for each domain; widely used for file systems [»dennPJ_1980]

Quote: ASSIGN a|^1000 reserves a block of storage on the drum; uses one variable in memory [»laniJH1_1954]