Veritas File System 5.0 Administrator's Guide (September 2006)

Chapter 2 VxFS performance: creating, mounting, and tuning
file systems
mkfs command options ................................................................. 29
Block size ............................................................................. 29
Intent log size ........................................................................ 30
Choosing mount command options .................................................. 30
The log mode ......................................................................... 31
The delaylog mode ................................................................. 31
The tmplog mode ................................................................... 32
The logiosize mode ................................................................. 33
The nodatainlog mode ............................................................. 33
The blkclear mode .................................................................. 33
The mincache mode ................................................................ 33
The convosync mode ............................................................... 35
The ioerror mode ................................................................... 36
The largefiles|nolargefiles option .............................................. 37
The cio option ....................................................................... 39
Combining mount command options ......................................... 39
Using kernel tunables ................................................................... 40
Tuning inode table size ........................................................... 40
VxFS Buffer Cache High Water Mark .......................................... 42
Number of Links to a File ......................................................... 43
VxFS Inode Free Time Lag ........................................................ 43
Veritas Volume Manager maximum I/O size ................................ 44
Monitoring free space ................................................................... 44
Monitoring fragmentation ....................................................... 44
Tuning I/O .................................................................................. 45
Tuning VxFS I/O parameters .................................................... 46
Tunable I/O parameters ........................................................... 47
File system tuning guidelines ................................................... 54
Chapter 3 Extent attributes
About extent attributes ................................................................. 57
Reservation: preallocating space to a file ..................................... 58
Fixed extent size .................................................................... 58
Other controls ....................................................................... 59
Commands related to extent attributes ............................................ 60
Failure to preserve extent attributes ........................................... 61
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