Yes, there must be something wrong with the defaults.
This seems to be a good starting point:
https://serverfault.com/questions/740311/drbd-terrible-sync-performance-on-10gige/740370
It looks more complex than I expected.
On 10/10/18 14:27, Gilberto Nunes wrote:
Hi
I think this problem is related DRDB and not PVE!
---
Gilberto Nunes Ferreira
(47) 3025-5907
(47) 99676-7530 - Whatsapp / Telegram
Skype: gilberto.nunes36
Em qua, 10 de out de 2018 às 10:23, Adam Weremczuk <[email protected]>
escreveu:
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.
Any idea why the sync rate is so painfully slow and how to improve it?
Regards,
Adam
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