Veritas File System 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

Intent log size ........................................................................ 28
Mounting a VxFS file system .......................................................... 28
The log mode ......................................................................... 29
The delaylog mode ................................................................. 29
The tmplog mode ................................................................... 30
The logiosize mode ................................................................. 31
The nodatainlog mode ............................................................. 31
The blkclear mode .................................................................. 31
The mincache mode ................................................................ 31
The convosync mode ............................................................... 33
The ioerror mode ................................................................... 34
The largefiles|nolargefiles option .............................................. 35
The cio option ....................................................................... 37
Combining mount command options ......................................... 37
Tuning the VxFS file system ........................................................... 38
Tuning inode table size ........................................................... 38
VxFS buffer cache high water mark ............................................ 40
Number of links to a file .......................................................... 41
VxFS inode free time lag .......................................................... 41
Veritas Volume Manager maximum I/O size ................................ 42
Monitoring free space ................................................................... 42
Monitoring fragmentation ....................................................... 42
Tuning I/O .................................................................................. 44
Tuning VxFS I/O parameters .................................................... 44
Tunable I/O parameters ........................................................... 45
File system tuning guidelines ................................................... 52
Chapter 3 Extent attributes
About extent attributes ................................................................. 55
Reservation: preallocating space to a file ..................................... 56
Fixed extent size .................................................................... 56
Other controls ....................................................................... 57
Commands related to extent attributes ............................................ 58
Failure to preserve extent attributes ........................................... 59
Chapter 4 VxFS I/O Overview
About VxFS I/O ............................................................................ 61
Buffered and Direct I/O ................................................................. 62
Direct I/O ............................................................................. 62
Unbuffered I/O ...................................................................... 63
Data synchronous I/O ............................................................. 63
Concurrent I/O ............................................................................ 64
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