[DRBD-user] Resync Incredibly Slow

[Papastavros Vaggelis]

Hi guys , 

Probably you need to adjust some of the parameters like 

max-epoch-size ; 
 max-buffers ;
 sndbuf-size ;
of the general drbd configuration file 

Please read also the following link 
https://serverfault.com/questions/740311/drbd-terrible-sync-performance-on-10gige

BR
Sent from my iPad

> On 20 Aug 2018, at 10:15, Adrian Pascalau <adrian27oradea at gmail.com> wrote:
> 
>> 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:
> 
> [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.
> 
> 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
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