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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-09 22:34:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-09 22:34:26 +0300
commite9a83bd2322035ed9d7dcf35753d3f984d76c6a5 (patch)
tree66dc466ff9aec0f9bb7f39cba50a47eab6585559 /Documentation/device-mapper/striped.txt
parent7011b7e1b702cc76f9e969b41d9a95969f2aecaa (diff)
parent454f96f2b738374da4b0a703b1e2e7aed82c4486 (diff)
downloadlinux-e9a83bd2322035ed9d7dcf35753d3f984d76c6a5.tar.xz
Merge tag 'docs-5.3' of git://git.lwn.net/linux
Pull Documentation updates from Jonathan Corbet: "It's been a relatively busy cycle for docs: - A fair pile of RST conversions, many from Mauro. These create more than the usual number of simple but annoying merge conflicts with other trees, unfortunately. He has a lot more of these waiting on the wings that, I think, will go to you directly later on. - A new document on how to use merges and rebases in kernel repos, and one on Spectre vulnerabilities. - Various improvements to the build system, including automatic markup of function() references because some people, for reasons I will never understand, were of the opinion that :c:func:``function()`` is unattractive and not fun to type. - We now recommend using sphinx 1.7, but still support back to 1.4. - Lots of smaller improvements, warning fixes, typo fixes, etc" * tag 'docs-5.3' of git://git.lwn.net/linux: (129 commits) docs: automarkup.py: ignore exceptions when seeking for xrefs docs: Move binderfs to admin-guide Disable Sphinx SmartyPants in HTML output doc: RCU callback locks need only _bh, not necessarily _irq docs: format kernel-parameters -- as code Doc : doc-guide : Fix a typo platform: x86: get rid of a non-existent document Add the RCU docs to the core-api manual Documentation: RCU: Add TOC tree hooks Documentation: RCU: Rename txt files to rst Documentation: RCU: Convert RCU UP systems to reST Documentation: RCU: Convert RCU linked list to reST Documentation: RCU: Convert RCU basic concepts to reST docs: filesystems: Remove uneeded .rst extension on toctables scripts/sphinx-pre-install: fix out-of-tree build docs: zh_CN: submitting-drivers.rst: Remove a duplicated Documentation/ Documentation: PGP: update for newer HW devices Documentation: Add section about CPU vulnerabilities for Spectre Documentation: platform: Delete x86-laptop-drivers.txt docs: Note that :c:func: should no longer be used ...
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-dm-stripe
-=========
-
-Device-Mapper's "striped" target is used to create a striped (i.e. RAID-0)
-device across one or more underlying devices. Data is written in "chunks",
-with consecutive chunks rotating among the underlying devices. This can
-potentially provide improved I/O throughput by utilizing several physical
-devices in parallel.
-
-Parameters: <num devs> <chunk size> [<dev path> <offset>]+
- <num devs>: Number of underlying devices.
- <chunk size>: Size of each chunk of data. Must be at least as
- large as the system's PAGE_SIZE.
- <dev path>: Full pathname to the underlying block-device, or a
- "major:minor" device-number.
- <offset>: Starting sector within the device.
-
-One or more underlying devices can be specified. The striped device size must
-be a multiple of the chunk size multiplied by the number of underlying devices.
-
-
-Example scripts
-===============
-
-[[
-#!/usr/bin/perl -w
-# Create a striped device across any number of underlying devices. The device
-# will be called "stripe_dev" and have a chunk-size of 128k.
-
-my $chunk_size = 128 * 2;
-my $dev_name = "stripe_dev";
-my $num_devs = @ARGV;
-my @devs = @ARGV;
-my ($min_dev_size, $stripe_dev_size, $i);
-
-if (!$num_devs) {
- die("Specify at least one device\n");
-}
-
-$min_dev_size = `blockdev --getsz $devs[0]`;
-for ($i = 1; $i < $num_devs; $i++) {
- my $this_size = `blockdev --getsz $devs[$i]`;
- $min_dev_size = ($min_dev_size < $this_size) ?
- $min_dev_size : $this_size;
-}
-
-$stripe_dev_size = $min_dev_size * $num_devs;
-$stripe_dev_size -= $stripe_dev_size % ($chunk_size * $num_devs);
-
-$table = "0 $stripe_dev_size striped $num_devs $chunk_size";
-for ($i = 0; $i < $num_devs; $i++) {
- $table .= " $devs[$i] 0";
-}
-
-`echo $table | dmsetup create $dev_name`;
-]]
-