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drbd-user: Re: [DRBD-user] Synced or not?

Re: [DRBD-user] Synced or not?

From: Adrian Overbury <adrian_at_nospam>
Date: Thu Mar 18 2010 - 02:00:13 GMT
To: drbd-user@lists.linbit.com

Cameron Smith wrote:
> Still a little fuzzy about where my data can go in relation to drbd.
>
> My lower level is:
> /dev/sda2 /data
>
> my drbd device is:
> /dev/drbd1
>
> The docs say not to access the lower level device after drbd is running
> so where do I put my files and data?
> If it's actually on the drbd1 device how to I access that? I cannot
> mount it like a partition using mount.

Have you told one of your DRBD nodes that it's the primary node? If you
haven't, then you won't be able to mount it. Once you've done that, you
could be able to create a filesystem on the drbd device (/dev/drbd1 in
your case) and mount it like any other block device.

>
> My config still looks like:
>
> global {
> usage-count yes;
> }
> common {
> protocol C;
> }
> resource r0 {
> on clst01.example.net <http://clst01.example.net/> {
> device /dev/drbd1;
> disk /dev/sda2;
> address 10.233.2.71:7789 <http://10.233.2.71:7789/>;
> meta-disk /dev/sda6[0];
> }
> on clst02.example.net <http://clst02.example.net/> {
> device /dev/drbd1;
> disk /dev/sda2;
> address 10.233.2.72:7789 <http://10.233.2.72:7789/>;
> meta-disk /dev/sda6[0];
> }
> }
>
>
> Thanks
> Cameron
>
>
> On Wed, Mar 17, 2010 at 2:40 PM, Cameron Smith <velvetpixel@gmail.com
> <mailto:velvetpixel@gmail.com>> wrote:
>
> Excellent!
> Thanks for the clarification :)
>
>
> On Wed, Mar 17, 2010 at 1:50 PM, Peter den Hartog
> <peterdenhartog@gmail.com <mailto:peterdenhartog@gmail.com>> wrote:
>
> What David said.. What file system are you using? ext3? then you
> will only see the changes if the primary actually fails on the
> first machine.
>
> and oh you might want to higher up your sync rate, if you don't
> want to wait for 4 days for DRBD to finish the first sync :-D.
>
>
>
> On Wed, Mar 17, 2010 at 4:40 PM, Cameron Smith
> <velvetpixel@gmail.com <mailto:velvetpixel@gmail.com>> wrote:
>
> I am stuck.
>
> I did in an initial install of DRBD and was able to achieve
> a sync from primary to secondary!
>
> Maybe.
>
> My partition that is source on primary and destination on
> secondary is:
>
> /dev/sda2 /data
>
> When I create files in the /data directory I can see that
> DRBD is recognizing that things are changing and when I run:
>
> cat /proc/drbd
>
> on both primary and secondary I see they both change if I
> modify or add files in /data on the primary.
>
>
> My question is why do I not see those same files on /data on
> the secondary?
>
> Shouldn't they be there?
>
>
> Here is the output of cat /proc/drbd from both systems:
>
> [[root@clst01 ~]# cat /proc/drbd
> version: 8.0.16 (api:86/proto:86)
> GIT-hash: d30881451c988619e243d6294a899139eed1183d build by
> mockbuild@v20z-x86-64.home.local, 2009-08-22 13:26:57
>
> 1: cs:SyncSource st:Primary/Secondary
> ds:UpToDate/Inconsistent C r---
> ns:712320 nr:0 dw:0 dr:712320 al:0 bm:43 lo:0 pe:0 ua:0 ap:0
> [>....................] sync'ed: 1.2% (62300/62996)M
> finish: 44:18:11 speed: 376 (320) K/sec
> resync: used:0/61 hits:44476 misses:44 starving:0 dirty:0
> changed:44
> act_log: used:0/127 hits:0 misses:0 starving:0 dirty:0 changed:0
>
>
>
> [root@clst02 ~]# cat /proc/drbd
> version: 8.0.16 (api:86/proto:86)
> GIT-hash: d30881451c988619e243d6294a899139eed1183d build by
> mockbuild@v20z-x86-64.home.local, 2009-08-22 13:26:57
>
> 1: cs:SyncTarget st:Secondary/Primary
> ds:Inconsistent/UpToDate C r---
> ns:0 nr:718400 dw:718400 dr:0 al:0 bm:43 lo:0 pe:0 ua:0 ap:0
> [>....................] sync'ed: 1.2% (62292/62996)M
> finish: 33:13:27 speed: 416 (320) K/sec
> resync: used:0/61 hits:44856 misses:44 starving:0 dirty:0
> changed:44
> act_log: used:0/127 hits:0 misses:0 starving:0 dirty:0 changed:0
>
>
> Thanks!
> Cameron
>
>
>
>
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>
>
>
>
> --
> Groet // Kind regards,
> Peter den Hartog
>
>
>
>
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