[DRBD-user] Sync of Nodes

Walter Robert Ditzler ditwal001 at gmail.com
Mon Aug 19 14:09:06 CEST 2013

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Dan,

you are absolutely right!!!!!!!!! Primary school mistake on my side!!!!!!!!

Thanks a lot,

Walter!

-----Original Message-----
From: drbd-user-bounces at lists.linbit.com
[mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Dan Barker
Sent: Montag, 19. August 2013 14:06
To: drbd-user at lists.linbit.com
Subject: Re: [DRBD-user] Sync of Nodes

> -----Original Message-----
> From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user- 
> bounces at lists.linbit.com] On Behalf Of Walter Robert Ditzler
> Sent: Monday, August 19, 2013 5:44 AM
> To: drbd-user at lists.linbit.com
> Subject: [DRBD-user] Sync of Nodes
> 
> Hi all,
> 
> I just made a test this weekend onto my new 2 XEN hosts:
> 
> - Debian Wheezy, Kernel 3.10.7, DRBD Tools 8.4.3, Node A=master, Node 
> B=secondary, XEN 4.3.0 Guests on LVM
> 
> ***
> root at srv-ldeb-xen001:/var/local/abbeoo/xen.d# /etc/init.d/drbd status 
> drbd driver loaded OK; device status:
> version: 8.4.3 (api:1/proto:86-101)
> srcversion: 19422058F8A2D4AC0C8EF09
> m:res           cs         ro                 ds                 p
> mounted
> fstype
> 11:drbd_host11  Connected  Primary/Secondary  UpToDate/ UpToDate  C
> ***
> 
> 
> What I did is to check if synchronization works. I tested as followed:
> 
> On Node A:
> 1) Create a file and save it in Desktop in my XEN Guest System
> 2) xl destroy host11 (kill my XEN Guest System)
> 3) drbdadm secondary drbd_host11
> 
> Then I continue on Node B
> 1) drbdadm primary drbd_host11
> 2) xl create host11.cfg (Start my XEN Guest System)
> 3) No file on the desktop!!!
> 
> It seem that the synchronization doesn't work. When I shutdown Node B 
> and start Node A again, I see the file again on the desktop.
> 
> Can anyone help me out here? Do I make any mistake while starting DRBD 
> at boot?
> 
> Thanks a lot,
> 
> Walter
> 
> 
> My Nodes are linked and working
> 
> ***
> root at srv-ldeb-xen001:/var/local/abbeoo/xen.d# cat /proc/drbd
> version: 8.4.3 (api:1/proto:86-101)
> srcversion: 19422058F8A2D4AC0C8EF09
> 
> 11: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
>     ns:0 nr:0 dw:0 dr:664 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f 
> oos:0
> ***
> 
> ***
> root at srv-ldeb-xen002:/var/local/xen/xen.d# cat /proc/drbd
> version: 8.3.13 (api:88/proto:86-96)
> srcversion: ECB278A2285B40525B8362B
> 
> 11: cs:Connected ro:Secondary/Primary ds:UpToDate/UpToDate C r-----
>     ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0
> ***
> 
> 
> *** PING on Node A to Node B
> root at srv-ldeb-xen001:/var/local/abbeoo/xen.d# ping 10.255.255.2 PING 
> 10.255.255.2 (10.255.255.2) 56(84) bytes of data.
> 64 bytes from 10.255.255.2: icmp_req=1 ttl=64 time=0.195 ms
> ***
> 
> *** Ping on Node B to Node A
> root at srv-ldeb-xen002:/var/local/xen/xen.d# ping 10.255.255.1 PING 
> 10.255.255.1 (10.255.255.1) 56(84) bytes of data.
> 64 bytes from 10.255.255.1: icmp_req=1 ttl=64 time=0.277 ms
> ***
> 

All the reads and writes counters are showing zeros.

Are you sure Xen is using the drbd resources and not the underlying storage?
Xen should be accessing /dev/drbd11. My guess is that it's looking at
/dev/vgdata1/host11.

Dan
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