Veritas™ File System 5.0.1 Administrator's Guide

Chapter 2 VxFS performance: creating, mounting, and tuning
file systems ..................................................................... 33
Creating a VxFS file system ............................................................ 33
Block size ............................................................................. 33
Intent log size ........................................................................ 34
Mounting a VxFS file system .......................................................... 34
The log mode ......................................................................... 35
The delaylog mode ................................................................. 36
The tmplog mode ................................................................... 36
The logiosize mode ................................................................. 37
The nodatainlog mode ............................................................ 37
The blkclear mode .................................................................. 38
The mincache mode ................................................................ 38
The convosync mode .............................................................. 39
The ioerror mode ................................................................... 40
The largefiles|nolargefiles option .............................................. 42
The cio option ....................................................................... 43
The mntlock|mntunlock option ................................................. 43
Combining mount command options ......................................... 44
Tuning the VxFS file system ........................................................... 44
Tuning inode table size ........................................................... 45
VxFS buffer cache high water mark ........................................... 47
Number of links to a file .......................................................... 47
VxFS inode free time lag .......................................................... 48
Monitoring free space ................................................................... 48
Monitoring fragmentation ....................................................... 49
Thin Reclamation ................................................................... 50
Tuning I/O .................................................................................. 51
Tuning VxFS I/O parameters .................................................... 51
Tunable I/O parameters .......................................................... 52
File system tuning guidelines ................................................... 60
Chapter 3 Extent attributes ................................................................. 63
About extent attributes ................................................................. 63
Reservation: preallocating space to a file .................................... 64
Fixed extent size .................................................................... 64
Other controls ....................................................................... 65
Commands related to extent attributes ............................................ 66
Failure to preserve extent attributes .......................................... 67
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