[DRBD-user] slow sync speed

Daniel Carrasco d.carrasco at i2tic.com
Thu Oct 11 08:35:44 CEST 2018


Primary is mounted?. I've got similar behavior on my setup, and just when
I've umounted the disk it started to sync very fast.

Greetings.

El jue., 11 oct. 2018 8:29, Adam Weremczuk <adamw at matrixscience.com>
escribió:

> Hi all,
>
> I'm trying out DRBD Pacemaker HA Cluster on Proxmox 5.2
>
> I have 2 identical servers connected with 2 x 1 Gbps links in bond_mode
> balance-rr.
>
> The bond is working fine; I get a transfer rate of 150 MB/s with scp.
>
> Following this guide:
> https://www.theurbanpenguin.com/drbd-pacemaker-ha-cluster-ubuntu-16-04/
> was going  smoothly up until:
>
> drbdadm -- --overwrite-data-of-peer primary r0/0
>
> cat /proc/drbd
> version: 8.4.10 (api:1/proto:86-101)
> srcversion: 17A0C3A0AF9492ED4B9A418
>   0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r-----
>      ns:10944 nr:0 dw:0 dr:10992 al:8 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f
> oos:3898301536
>      [>....................] sync'ed:  0.1% (3806932/3806944)M
>      finish: 483:25:13 speed: 2,188 (2,188) K/sec
>
> The transfer rate is horribly slow and at this pace it's going to take
> 20 days for two 4 TB volumes to sync!
>
> That's almost 15 times slower comparing with the guide video (8:30):
> https://www.youtube.com/watch?v=WQGi8Nf0kVc
>
> The volumes have been zeroed and contain no live data yet.
>
> My sdb disks are logical drives (hardware RAID) set up as RAID50 with
> the defaults:
>
> Strip size: 128 KB
> Access policy: RW
> Read policy: Normal
> Write policy: Write Back with BBU
> IO policy: Direct
> Drive Cache: Disable
> Disable BGI: No
>
> Performance looks good when tested with hdparm:
>
> hdparm -tT /dev/sdb1
>
> /dev/sdb1:
>   Timing cached reads:   15056 MB in  1.99 seconds = 7550.46 MB/sec
>   Timing buffered disk reads: 2100 MB in  3.00 seconds = 699.81 MB/sec
>
> The volumes have been zeroed and contain no live data yet.
>
> It seems to be a problem with default DRBD settings.
>
> Can anybody recommend optimal tweaks specific to my environment?
>
> Regards,
> Adam
>
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