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ELVTUNE(8)									       ELVTUNE(8)

       elvtune - I/O elevator tuner

       elvtune [ -r r_lat ] [ -w w_lat ] [ -b b_max ] /dev/blkdev1 [ /dev/blkdev2 ...  ]

       elvtune -h

       elvtune -v

       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

       -r r_lat
	      set the max latency that the I/O scheduler will provide on each read.

       -w w_lat
	      set the max latency that the I/O scheduler will provide on each write.

       -b b_max
	      max coalescing factor allowed on writes when there are reads pending in the queue.

       -h     help.

       -v     version.

       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 <andrea@suse.de> SuSE

Version 1.0				  14 March 2000 			       ELVTUNE(8)
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