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Each entry in tunefstab is a line of fields in one of the following formats:
block_device tunefs optionssystem_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 device and system_default, the device 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.
/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:
Last updated: 01 April 2006
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