[DRBD-user] Resync Incredibly Slow

[Eric Robinson]

> On Sun, Aug 19, 2018 at 1:39 AM, Eric Robinson <eric.robinson at psmnv.com>
> wrote:
> >
> > I’ve been using drbd for a decade, but this is my first experience
> > with drbd 9.0.14. The resync is incredibly slow. Normally, resync
> > takes a few seconds to a few minutes, but this is taking hours,
> > advancing just a few hundredths of a percent every few seconds…
> >
> 
> Hi Eric,
> 
> I am wondering, are you running drbd in physical hosts, or vitual machines?
> 
> I am in a worse situation with the same version of drbd, installed in two up to
> date Centos 7 virtual machines running in an OpenStack pike environment, with
> the same version of drbd installed from the elrepo
> repository:

We have Centos 7.5 servers running in Microsoft Azure. 

> 
> [root at drbd1 ~]# rpm -qa | grep kmod-drbd
> kmod-drbd90-9.0.14-1.el7_5.elrepo.x86_64
> 
> I configured this environment last week Thursday, and believe it or not, as of
> today sync is at 0.1%:
> 
> [root at drbd1 ~]# cat
> /sys/kernel/debug/drbd/resources/drbd0/connections/drbd2.novalocal/0/proc_
> drbd
>  0: cs:SyncSource ro:Secondary/Secondary ds:UpToDate/Inconsistent C r-----
>     ns:6363972 nr:0 dw:0 dr:112432036 al:0 bm:0 lo:0 pe:[0;4] ua:52 ap:[0;0]
> ep:1 wo:1 oos:5242556
>         [>....................] sync'ed:  0.1% (5116/5116)M
>         finish: 127:25:23 speed: 0 (0 -- 0) K/sec
>           0% sector pos: 0/10485368
>         resync: used:1/61 hits:62 misses:2 starving:0 locked:0 changed:1
>         act_log: used:0/1237 hits:0 misses:0 starving:0 locked:0 changed:0
>         blocked on activity log: 0
> 
> Whatever I did, did not help, so finally I replicated the environment in my
> laptop, in a VMware Workstation 11 environment, using the same version of
> drbd, and in this case I have no issues.
> 

Hmm. I have absolutely no idea what to say about that. If I did, my own issue would be fixed. 😉

> This is my first experience with drbd, so I do not know how to troubleshoot.
> Now I am thinking to look into older 8.x version, that might be working better.
> 
> Regards,
> Adrian