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+================================
+Device-mapper "unstriped" target
+================================
+
+Introduction
+============
+
+The device-mapper "unstriped" target provides a transparent mechanism to
+unstripe a device-mapper "striped" target to access the underlying disks
+without having to touch the true backing block-device. It can also be
+used to unstripe a hardware RAID-0 to access backing disks.
+
+Parameters:
+<number of stripes> <chunk size> <stripe #> <dev_path> <offset>
+
+<number of stripes>
+ The number of stripes in the RAID 0.
+
+<chunk size>
+ The amount of 512B sectors in the chunk striping.
+
+<dev_path>
+ The block device you wish to unstripe.
+
+<stripe #>
+ The stripe number within the device that corresponds to physical
+ drive you wish to unstripe. This must be 0 indexed.
+
+
+Why use this module?
+====================
+
+An example of undoing an existing dm-stripe
+-------------------------------------------
+
+This small bash script will setup 4 loop devices and use the existing
+striped target to combine the 4 devices into one. It then will use
+the unstriped target on top of the striped device to access the
+individual backing loop devices. We write data to the newly exposed
+unstriped devices and verify the data written matches the correct
+underlying device on the striped array::
+
+ #!/bin/bash
+
+ MEMBER_SIZE=$((128 * 1024 * 1024))
+ NUM=4
+ SEQ_END=$((${NUM}-1))
+ CHUNK=256
+ BS=4096
+
+ RAID_SIZE=$((${MEMBER_SIZE}*${NUM}/512))
+ DM_PARMS="0 ${RAID_SIZE} striped ${NUM} ${CHUNK}"
+ COUNT=$((${MEMBER_SIZE} / ${BS}))
+
+ for i in $(seq 0 ${SEQ_END}); do
+ dd if=/dev/zero of=member-${i} bs=${MEMBER_SIZE} count=1 oflag=direct
+ losetup /dev/loop${i} member-${i}
+ DM_PARMS+=" /dev/loop${i} 0"
+ done
+
+ echo $DM_PARMS | dmsetup create raid0
+ for i in $(seq 0 ${SEQ_END}); do
+ echo "0 1 unstriped ${NUM} ${CHUNK} ${i} /dev/mapper/raid0 0" | dmsetup create set-${i}
+ done;
+
+ for i in $(seq 0 ${SEQ_END}); do
+ dd if=/dev/urandom of=/dev/mapper/set-${i} bs=${BS} count=${COUNT} oflag=direct
+ diff /dev/mapper/set-${i} member-${i}
+ done;
+
+ for i in $(seq 0 ${SEQ_END}); do
+ dmsetup remove set-${i}
+ done
+
+ dmsetup remove raid0
+
+ for i in $(seq 0 ${SEQ_END}); do
+ losetup -d /dev/loop${i}
+ rm -f member-${i}
+ done
+
+Another example
+---------------
+
+Intel NVMe drives contain two cores on the physical device.
+Each core of the drive has segregated access to its LBA range.
+The current LBA model has a RAID 0 128k chunk on each core, resulting
+in a 256k stripe across the two cores::
+
+ Core 0: Core 1:
+ __________ __________
+ | LBA 512| | LBA 768|
+ | LBA 0 | | LBA 256|
+ ---------- ----------
+
+The purpose of this unstriping is to provide better QoS in noisy
+neighbor environments. When two partitions are created on the
+aggregate drive without this unstriping, reads on one partition
+can affect writes on another partition. This is because the partitions
+are striped across the two cores. When we unstripe this hardware RAID 0
+and make partitions on each new exposed device the two partitions are now
+physically separated.
+
+With the dm-unstriped target we're able to segregate an fio script that
+has read and write jobs that are independent of each other. Compared to
+when we run the test on a combined drive with partitions, we were able
+to get a 92% reduction in read latency using this device mapper target.
+
+
+Example dmsetup usage
+=====================
+
+unstriped on top of Intel NVMe device that has 2 cores
+------------------------------------------------------
+
+::
+
+ dmsetup create nvmset0 --table '0 512 unstriped 2 256 0 /dev/nvme0n1 0'
+ dmsetup create nvmset1 --table '0 512 unstriped 2 256 1 /dev/nvme0n1 0'
+
+There will now be two devices that expose Intel NVMe core 0 and 1
+respectively::
+
+ /dev/mapper/nvmset0
+ /dev/mapper/nvmset1
+
+unstriped on top of striped with 4 drives using 128K chunk size
+---------------------------------------------------------------
+
+::
+
+ dmsetup create raid_disk0 --table '0 512 unstriped 4 256 0 /dev/mapper/striped 0'
+ dmsetup create raid_disk1 --table '0 512 unstriped 4 256 1 /dev/mapper/striped 0'
+ dmsetup create raid_disk2 --table '0 512 unstriped 4 256 2 /dev/mapper/striped 0'
+ dmsetup create raid_disk3 --table '0 512 unstriped 4 256 3 /dev/mapper/striped 0'