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
<[email protected] <mailto:[email protected]>> 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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