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SubjectRe: [PATCH v4 1/2] dm-unstripe: unstripe RAID 0/dm-striped device
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On 12/18/2017 09:28 AM, Scott Bauer wrote:
> This device mapper module remaps and unstripes IO so it lands
> solely on a single drive in a RAID 0/dm-stripe target.
> In a 4 drive RAID 0 the mapper exposes 1/4th of the LBA range
> as a virtual drive. Each IO to that virtual drive will land on
> only one of the 4 drives, selected by the user.
>
> Signed-off-by: Scott Bauer <scott.bauer@intel.com>
> Acked-by: Keith Busch <keith.busch@intel.com>
> ---
> drivers/md/Kconfig | 10 +++
> drivers/md/Makefile | 1 +
> drivers/md/dm-unstripe.c | 204 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 215 insertions(+)
> create mode 100644 drivers/md/dm-unstripe.c
>
> diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
> index 83b9362be09c..e1c48a7f98f1 100644
> --- a/drivers/md/Kconfig
> +++ b/drivers/md/Kconfig
> @@ -269,6 +269,16 @@ config DM_BIO_PRISON
>
> source "drivers/md/persistent-data/Kconfig"
>
> +config DM_UN_STRIPE
> + tristate "Transpose IO to individual drives on a raid device"
> + depends on BLK_DEV_DM
> + ---help---
> + Enable this feature if you with to unstripe I/O on a RAID 0
> + device to the respective drive. If your hardware has physical
> + RAID 0 this module can unstripe the I/O to respective sides.

What does "sides" mean above?

> +
> + If unsure say N.
> +
thanks,
--
~Randy

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