Veritas File System 5.1 SP1 Administrator"s Guide (5900-1499, April 2011)

Chapter 2 VxFS performance: creating, mounting, and tuning
file systems ..................................................................... 33
Creating a VxFS file system ............................................................ 33
Block size ............................................................................. 34
Intent log size ........................................................................ 34
Mounting a VxFS file system .......................................................... 35
The log mode ......................................................................... 36
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 ................................................. 44
Combining mount command options ......................................... 44
Tuning the VxFS file system ........................................................... 45
Tuning inode table size ........................................................... 45
Tuning performance optimization of inode allocation ................... 47
VxFS buffer cache high water mark ........................................... 47
Number of links to a file .......................................................... 48
VxFS inode free time lag .......................................................... 48
Partitioned directories ............................................................ 49
Monitoring free space ................................................................... 49
Monitoring fragmentation ....................................................... 50
Thin Reclamation ................................................................... 51
Tuning I/O .................................................................................. 52
Tuning VxFS I/O parameters .................................................... 53
Tunable I/O parameters .......................................................... 54
File system tuning guidelines ................................................... 61
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
Example of setting an extent attribute ....................................... 67
Example of getting an extent attribute ....................................... 67
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