[AlmaLinux Users] Re: Almalinux and integritysetup speed problem

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 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. _______________________________________________ AlmaLinux Users mailing list -- users@lists.almalinux.org mailto:users@lists.almalinux.org To unsubscribe send an email to users-leave@lists.almalinux.org mailto:users-leave@lists.almalinux.org

-- Jonathan Wright AlmaLinux Foundation Mattermost: chat https://chat.almalinux.org/almalinux/messages/@jonathan