lkml.org 
[lkml]   [2013]   [Jan]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [dm-devel] [PATCH 0/3 v3] add resync speed control for dm-raid1
Hi

I did this already some times ago.
I'm sending my patches in the next mail.

Basically, my and Guangliang's patches have the following differences:

my patch: uses per-module throttle settings
Guangliang's patch: uses per-device settings
(my patch could be changed to use per-device throttle too, but without
userspace support it isn't much useful because userspace lvm can
reload the mirror and per-device settings would be lost)

my patch: uses fine grained throttling of the individual IOs in kcopyd -
it measures active/inactive ratio and if the disk is active more than the
specified percentage of time, sleep is inserted.
Guangliang's patch: throttles on segment granularity, it waits when
starting new segment, but segment is copied unthrottled.

my patch: the user selects a percentage value (0 - 100) in
"/sys/module/dm_mirror/parameters/raid1_resync_throttle", the device is
kept active the specified percent of time
Guangliang's patch: limits the number of segments per a specified
interval

My patch is noticeably bigger.

Mikulas


On Mon, 7 Jan 2013, Guangliang Zhao wrote:

> Hi,
>
> These patches are used to add resync speed control for dm-raid1. The
> second and third patch provide support for user-space tool dmsetup.
> I have made some modifications by the comments. This is the third
> version.
>
> Guangliang Zhao (3):
> dm raid1: add resync speed control for dm-raid1
> dm raid1: add interface to set resync speed
> dm raid1: add interface to get resync speed
>
> drivers/md/dm-raid1.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 89 insertions(+), 1 deletion(-)
>
> --
> 1.7.10.4
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>


\
 
 \ /
  Last update: 2013-01-09 07:21    [W:0.118 / U:0.612 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site