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.