========= 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;