linux-stable.git/Documentation/device-mapper, branch v4.16.2

dm cache: Documentation: update default migration_throttling value

2018-01-30T21:55:47+00:00

In commit f8350daf7af0 ("dm cache: tune migration throttling") the
value for DEFAULT_MIGRATION_THRESHOLD was decreased from 204800 to
2048.  Edit device-mapper/cache.txt to reflect the correct default
value for migration_threshold.

Signed-off-by: John Pittman 
Signed-off-by: Mike Snitzer

dm thin: extend thinpool status format string with omitted fields

2018-01-17T14:16:12+00:00

Signed-off-by: mulhern 
Signed-off-by: Mike Snitzer

dm thin: fixes in thin-provisioning.txt

2018-01-17T14:16:12+00:00

Make the format string for thinpool status more correct.

Swap the order of two items to correspond with reality.

Signed-off-by: mulhern 
Signed-off-by: Mike Snitzer

dm thin: document representation of when there is none

2018-01-17T14:16:11+00:00

Signed-off-by: mulhern 
Signed-off-by: Mike Snitzer

dm thin: fix documentation relative to low water mark threshold

2018-01-17T14:16:10+00:00

Fixes:
1. The use of "exceeds" when the opposite of exceeds, falls below,
was meant.
2. Properly speaking, a table can not exceed a threshold.

It emphasizes the important point, which is that it is the userspace
daemon's responsibility to check for low free space when a device
is resumed, since it won't get a special event indicating low free
space in that situation.

Signed-off-by: mulhern 
Signed-off-by: Mike Snitzer

dm cache: be consistent in specifying sectors and SI units in cache.txt

2018-01-17T14:16:09+00:00

Signed-off-by: mulhern 
Signed-off-by: Mike Snitzer

dm cache: delete obsoleted paragraph in cache.txt

2018-01-17T14:16:08+00:00

The 'mq' policy is no longer the default policy, and the default policy,
'smq', does not store hit counts.

Signed-off-by: mulhern 
Signed-off-by: Mike Snitzer

dm cache: fix grammar in cache-policies.txt

2018-01-17T14:16:07+00:00

Use possessive pronoun where appropriate, instead of contraction.

Signed-off-by: mulhern 
Signed-off-by: Mike Snitzer

dm snapshot: improve documentation relative to origin suspend requirements

2018-01-17T14:16:06+00:00

Add a note to snapshot.txt that the origin target must be suspended when
loading or unloading the snapshot target.

Signed-off-by: Mikulas Patocka 
Signed-off-by: Mike Snitzer

dm: add unstriped target

2018-01-17T14:16:00+00:00

This device mapper "unstriped" target remaps and unstripes I/O so it
is issued solely on a single drive in a HW RAID0 or dm-striped target.

In a 4 drive HW RAID0 the striped target exposes 1/4th of the LBA range
as a virtual drive.  Each I/O to that virtual drive will only be issued
to the 1 drive that was selected of the 4 drives in the HW RAID0.

This unstriped target is most useful for Intel NVMe drives that have
multiple cores but that do not have firmware control to pin separate LBA
ranges to each discrete cpu core.

Signed-off-by: Scott Bauer 
Signed-off-by: Heinz Mauelshagen 
Acked-by: Keith Busch 
Signed-off-by: Mike Snitzer