NAME
vxfs_ra_per_disk — amount of VxFS file system read-ahead per disk, in KB
Acceptable Values:
Default
1024
Specify an integer value or use an integer formula expression.
DESCRIPTION
When data is read from a disk drive, the system may read additional data
beyond that requested by the operation.
This "read-ahead" speeds up sequential disk accesses,
by anticipating that additional data will be read, and
having it available in system buffers before it is requested.
This parameter specifies the amount of read-ahead permitted per disk drive.
The total amount of read-ahead is determined by multiplying
vxfs_ra_per_disk
by the number of drives in the logical volume.
If the filesystem does not reside in a logical volume, then the number
of drives is effectively one.
The total amount of read-ahead that the kernel may have
outstanding for a single VxFS filesystem is constrained by
vxfs_max_ra_kbytes.
For more information, see the example in the description of
vxfs_max_ra_kbytes(5).
WARNINGS
All HP-UX kernel tunable parameters are release specific.
This parameter may be removed or have its meaning changed in
future releases of HP-UX.
AUTHOR
vxfs_ra_per_disk
was developed by HP.
SEE ALSO
hfs_max_ra_blocks(5),
hfs_max_revra_blocks(5),
hfs_ra_per_disk(5),
hfs_revra_per_disk(5),
vxfs_max_ra_kbytes(5),
vxfs_ra_per_disk(5)
Printable version
