[dm-devel] [PATCH 0/3 v3] add resync speed control for dm-raid1
Mikulas Patocka
mpatocka at redhat.com
Wed Jan 9 05:43:21 UTC 2013
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
>
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