|Linux & Unix Commands - Search Man Pages
elvtune - I/O elevator tuner
elvtune [ -r r_lat ] [ -w w_lat ] [ -b b_max ] /dev/blkdev1 [ /dev/blkdev2 ... ]
elvtune allows to tune the I/O elevator per blockdevice queue basis. The tuning can be
safely done at runtime. Tuning the elevator means being able to change disk performance
and interactiveness. In the output of elvtune the address of the queue tuned will be shown
and it can be considered as a queue ID. For example multiple partitions in the same hard-
disk will share the same queue and so tuning one partition will be like tuning the whole
set the max latency that the I/O scheduler will provide on each read.
set the max latency that the I/O scheduler will provide on each write.
max coalescing factor allowed on writes when there are reads pending in the queue.
Actually the only fields tunable are those relative to the IO scheduler. It's not possible
to select a one-way or two-way elevator yet.
For logical blockdevices like LVM the tuning has to be done on the physical devices. Tun-
ing the queue of the LVM logical device is useless.
0 on success and 1 on failure.
Ioctls for tuning elevator behaviour were added in Linux 2.3.99-pre1.
Andrea Arcangeli <firstname.lastname@example.org> SuSE
Version 1.0 14 March 2000 ELVTUNE(8)
All times are GMT -4. The time now is 10:15 AM.