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ELVTUNE(8)                                                          ELVTUNE(8)

       elvtune - I/O elevator tuner

       elvtune [-r r_lat] [-w w_lat] [-b b_max] device...
       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 out-
       put 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 harddisk will share the same queue and  so  tuning  one  partition
       will be like tuning the whole HD.

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

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

       -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  sched-
       uler. 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. Tuning the queue of the LVM logical  device  is  use-

       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

       The  elvtune command is part of the util-linux-ng package and is avail-
       able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

Version 1.0                      14 March 2000                      ELVTUNE(8)

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Gedruckt am: 17.12.2017 15:03 GMT+0100 (2017-12-17T15:03:03+01:00)