HP-UX Reference (11i v2 03/08) - 4 File Formats (vol 8)

t
tunefstab(4) tunefstab(4)
NAME
tunefstab - VxFS file system tuning parameters table
DESCRIPTION
The
tunefstab file contains tuning parameters for VxFS file systems.
tunefs sets the tuning parame-
ters for mounted file systems by processing command line options or by reading parameters in the
tunefstab file.
Each entry in
tunefstab is a line of fields in one of the following formats:
block-device tunefs-options
system-default tunefs-options
block-device is the name of the device on which the file system is mounted. If there is more than one line
that specifies options for a device, each line is processed and the options are set in order.
In place of block-device , system-default specifies tunables for each device to process. If there is an entry
for both a block-device and system-default, the system-default value takes precedence.
Lines in
tunefstab that start with the pound (#) character are treated as comments and ignored.
The tunefs-options correspond to the tunable parameters that
vxtunefs and mount_vxfs set on the
file system. Each option in this list is a name=value pair. Separate the options by commas, with no
spaces or tabs between the options and commas.
See the vxtunefs (1M) manual page for a description of the supported options.
EXAMPLES
If you have a four column striped volume,
/dev/vx/dsk/datadb/db03
, with a stripe unit size of 128
kilobytes per disk, set the
read_pref_io and read_nstream parameters 128 and four, respectively.
You can do this in two ways:
/dev/vx/dsk/datadg/db03 read_pref_io=128k,read_nstream=4
or:
/dev/vx/dsk/datadg/db03 read_pref_io=128k
/dev/vx/dsk/datadg/db03 read_nstream=4
To set the discovered direct I/O size lower so that it is always lower than the default, add the following
line to the /etc/vx/tunefstab
file:
/dev/dsk/c3t1d0 discovered_direct_iosz=128K
FILES
/etc/vx/tunefstab
Default tunefstab file.
SEE ALSO
mkfs_vxfs(1M), mount(1M), vxtunefs(1M).
VERITAS File System Administrator’s Guide.
Section 4−−358 Hewlett-Packard Company − 1 − HP-UX 11i Version 2: August 2003