summaryrefslogtreecommitdiffstats
path: root/Documentation/device-mapper/striped.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/device-mapper/striped.txt')
-rw-r--r--Documentation/device-mapper/striped.txt58
1 files changed, 0 insertions, 58 deletions
diff --git a/Documentation/device-mapper/striped.txt b/Documentation/device-mapper/striped.txt
deleted file mode 100644
index f34d323..0000000
--- a/Documentation/device-mapper/striped.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-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 a power-of-2 and 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 and a multiple of 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 --getsize $devs[0]`;
-for ($i = 1; $i < $num_devs; $i++) {
- my $this_size = `blockdev --getsize $devs[$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`;
-]]
-