[DRBD-user] drbd verify

[Nick Potemkin]

Hello!

I can't understand how to verify process works.
In my mind, it calculate differents between this node (where verify was
running) and another replicas.
I have three-nodes resource (every with local storage)
csshv-90 - Primary
csshv-91 - Secondary
csshv-94 - Secondary

root at csshv-90:~# drbdadm verify one-vm-106-disk-0
root at csshv-90:~# dmesg -T|grep 106-disk-0|grep 'Online verify found'
[Tue Apr 28 18:59:53 2020] drbd one-vm-106-disk-0/0 drbd1034 csshv-91:
Online verify found 8 4k blocks out of sync!

That's all. Primary get me, that there is only 32kb out of sync on csshv-91
No any error messages on another nodes.

Then we go to csshv-91

root at csshv-91:~# drbdadm verify one-vm-106-disk-0
root at csshv-91:~# dmesg -T|grep 106-disk-0|grep 'Online verify found'
Nothing found - no problems

but in the same time
root at csshv-90:~# dmesg -T|grep 106-disk-0|grep 'Online verify found'
[Tue Apr 28 19:12:57 2020] drbd one-vm-106-disk-0/0 drbd1034 csshv-91:
Online verify found 8 4k blocks out of sync!

root at csshv-94:~# dmesg -T|grep 106-disk-0|grep 'Online verify found'
[Tue Apr 28 19:13:02 2020] drbd one-vm-106-disk-0/0 drbd1034 csshv-91:
Online verify found 97632 4k blocks out of sync!

Hm... how many out-of-sync... Why?

And, finally go to csshv-94

root at csshv-94:~# drbdadm verify one-vm-106-disk-0
root at csshv-94:~# dmesg -T|grep 106-disk-0|grep 'Online verify found'
[Tue Apr 28 19:43:43 2020] drbd one-vm-106-disk-0/0 drbd1034 csshv-91:
Online verify found 97632 4k blocks out of sync!
No any error messages on another nodes.

WTF? 382MB out-of-sync??? Between csshv-94 and csshv-91? But no out-of-sync
between csshv-94 and csshv-90(primary)? And only 8 out-of-sync blocks
betweeh csshv-91 and csshv-90(primary)?

I can't understand this process. Can anybody make clear it for me?


Nick Potemkin
Mobile: +7 916 600 0731
ICQ: 8091533
SKYPE: nick.potemkin
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