tunefstab(4)tunefstab(4)NAMEtunefstab - VxFS file system tuning parameters table
The file contains tuning parameters for VxFS file systems. sets the
tuning parameters for mounted file systems by processing command line
options or by reading parameters in the file.
Each entry in is a line of fields in one of the following formats:
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 that start with the pound (#) character are treated as com‐
ments and ignored.
The tunefs-options correspond to the tunable parameters that and set on
the file system. Each option in this list is a name=value pair. Sepa‐
rate the options by commas, with no spaces or tabs between the options
See the vxtunefs(1M) manual page for a description of the supported
If you have a four column striped volume, with a stripe unit size of
128 kilobytes per disk, set the and parameters 128 and four, respec‐
tively. You can do this in two ways:
To set the discovered direct I/O size lower so that it is always lower
than the default, add the following line to the file:
SEE ALSOmkfs_vxfs(1M), mount(1M), vxtunefs(1M).