[DRBD-user] why does drbd 8.2.7/8.2.8 take so long to sync

Lars Ellenberg lars.ellenberg at linbit.com
Mon Feb 16 10:58:03 CET 2009

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


On Sun, Feb 15, 2009 at 10:32:05PM +0100, Raoul Bhatia [IPAX] wrote:
> hi,
> 
> i repeatetly hit "cat /proc/drbd" to witness that drbd is not syncing
> as fast as expected:
> 
>  > root at wc01 /etc # cat /proc/drbd
>  > version: 8.2.7 (api:88/proto:86-88)
>  > GIT-hash: cd953e17c5eb47e7df835024fee4b13e5fcaa217 debian/rules build 
> by root at wc02, 2009-01-31 18:53:19
>  >  0: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
>  >     ns:0 nr:67800 dw:67800 dr:0 al:0 bm:278 lo:1 pe:0 ua:0 ap:0 ep:1 
> wo:b oos:20684
>  >         [==============>.....] sync'ed: 77.3% (20684/88484)K
>  >         finish: 0:01:43 speed: 132 (4,520) K/sec

[...]

> why is drbd talking that long to sync in this case?

Q: "my drbd is syncing slow. why is that?"


I'm sure you can do better than that?

if not, I'd have to say
A: because.

configuration?
backend storage?
network?
what else is going on
 on the DRBD,
 on the backend storage,
 on the replication link?


-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.
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