Hi Jonathan,
and thank you for your answer.

I followed the suggestion on the link you purposed but setting
speed_limit_min to 200000 does not change anything. The rsync speed is
always speed=9984K/sec

and
        # sysctl dev.raid.speed_limit_min
          dev.raid.speed_limit_min = 200000

The sync speed limit seems not to be the problem.

(I received another email that says I'm a moderated member and my email
need to approved...why this?)

Thank you in advance.

Alessandro.

Il 10/04/24 17:44, Jonathan Wright ha scritto:
> You can adjust the mdadm rebuild rate pretty easily.  By default it's
> quite slow to avoid causing strain on system resources.
>
> See #1 at
> https://www.cyberciti.biz/tips/linux-raid-increase-resync-rebuild-speed.html <https://www.cyberciti.biz/tips/linux-raid-increase-resync-rebuild-speed.html>
>
> On Wed, Apr 10, 2024 at 10:36 AM Alessandro Baggi
> <alessandro.baggi@gmail.com <mailto:alessandro.baggi@gmail.com>> wrote:
>
>     Hi list,
>     I'm trying on a spare machine dm-integrity with mdadm raid1.
>     This is an old machine (i7-2600k). I'm using 2x500GB wd caviar black
>     SATA3.
>
>     I'm trying to run some test and see how much performance changes using
>     dm-integrity.
>
>     First I created a raid1 with mdadm and checked the performances and
>     writing 50G I got 100 MB/s
>
>     Then I destroied the md device and on every disk I run:
>
>              # integritysetup format --integrity xxhash64 /dev/sdb1
>              # integritysetup format --integrity xxhash64 /dev/sdc1
>
>     During this process the performances was good ~95MB/s.
>     After this I opened the devices with:
>
>              # integritysetup open integrity xxhash64 /dev/sdb1 sdb1
>              # integritysetup open integrity xxhash64 /dev/sdc1 sdc1
>
>     and created the mdadm array with:
>
>              # mdadm --create /dev/md10 --level=raid1 --raid-devices=2
>     /dev/mapper/sdb1 /dev/mapper/sdc1
>
>     and reading on /proc/mdstat I got this:
>
>     [>....................]  resync =  1.1% (4929792/443175424)
>     finish=677.3min speed=10782K/sec
>
>     Why there is so big drop on speed during the sync?
>
>     I'm missing something?
>
>     I'll need 11 hours to sync 2x500GB hdd? Why so slow?
>
>     Before this I tried the same on a newer machine with i7 8700k and 2x2TB
>     WD gold and I get a drop sync speed at ~35MB/s.
>
>     There is something that I can do to improve this?
>
>     Thank you in advance.
>
>     Alessandro.
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>
>
> --
> Jonathan Wright
> AlmaLinux Foundation
> Mattermost: chat <https://chat.almalinux.org/almalinux/messages/@jonathan>
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