ELVTUNE(8) System Manager's Manual ELVTUNE(8)NAME
elvtune - I/O elevator tuner
SYNOPSIS
elvtune [-r r_lat] [-w w_lat] [-b b_max] device...
elvtune -h
elvtune -v
DESCRIPTION
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 harddisk will share the same queue and so tuning one partition
will be like tuning the whole HD.
OPTIONS -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.
NOTE
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. Tuning the queue of the LVM logical device is useless.
RETURN VALUE
0 on success and 1 on failure.
HISTORY
Ioctls for tuning elevator behaviour were added in Linux 2.3.99-pre1.
AUTHORS
Andrea Arcangeli <andrea@suse.de> SuSE
AVAILABILITY
The elvtune command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
Version 1.0 14 March 2000 ELVTUNE(8)
Check Out this Related Man Page
MOUNTPOINT(1) User Commands MOUNTPOINT(1)NAME
mountpoint - see if a directory is a mountpoint
SYNOPSIS
mountpoint [-q] [-d] directory
mountpoint -x device
DESCRIPTION
mountpoint checks if the directory is mentioned in the /proc/self/mountinfo file.
OPTIONS -h, --help
Print help and exit.
-q, --quiet
Be quiet - don't print anything.
-d, --fs-devno
Print major/minor device number of the filesystem on stdout.
-x, --devno
Print major/minor device number of the blockdevice on stdout.
EXIT STATUS
Zero if the directory is a mountpoint, non-zero if not.
AUTHOR
Karel Zak <kzak@redhat.com>
ENVIRONMENT
LIBMOUNT_DEBUG=0xffff
enables debug output.
NOTES
The util-linux mountpoint implementation was written from scratch for libmount. The original version for sysvinit suite was written by
Miquel van Smoorenburg.
SEE ALSO mount(8)AVAILABILITY
The mountpoint command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
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