[DRBD-user] DRBD sync rate way low

Jesse A Dubin jdubin1 at lsu.edu
Mon Apr 12 15:56:00 CEST 2004

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




I don't know if this is related, but I have a lot lof zombie processes
running on my secondary:
  562 ?        00:03:39 drbdd_0
  609 ?        00:03:21 drbdd_1
  615 ?        00:00:02 drbd_asender_1 <defunct>
  657 ?        00:03:19 drbdd_2
  704 ?        00:01:40 drbdd_3
  709 ?        00:00:02 drbd_asender_3 <defunct>
  752 ?        00:01:41 drbdd_4
  756 ?        00:00:02 drbd_asender_4 <defunct>
  800 ?        00:18:20 drbdd_5
  847 ?        00:03:28 drbdd_6
  851 ?        00:00:02 drbd_asender_6 <defunct>
  895 ?        00:01:18 drbdd_7
  899 ?        00:00:05 drbd_asender_7 <defunct>
  943 ?        00:00:03 drbdd_8
  990 ?        00:05:10 drbdd_9
  994 ?        00:00:01 drbd_asender_9 <defunct>
 1038 ?        00:18:28 drbdd_10
 1045 ?        00:01:34 drbd_asender_10 <defunct>
 1620 ?        00:01:30 drbd_asender_5 <defunct>
 1625 ?        00:00:02 drbd_asender_0 <defunct>
 1631 ?        00:00:02 drbd_asender_8 <defunct>
 1638 ?        00:00:03 drbd_asender_2 <defunct>

Jesse
-----





Lars Ellenberg <Lars.Ellenberg at linbit.com>@lists.linbit.com on 04/12/2004
08:19:17 AM

Sent by:    drbd-user-admin at lists.linbit.com


To:    Jesse A Dubin <jdubin1 at lsu.edu>
cc:    drbd-user at nudlaug.linbit.com

Subject:    Re: [DRBD-user] DRBD sync rate way low

/ 2004-04-12 07:16:41 -0500
\ Jesse A Dubin:
>       Thanks for your replies.  I'll try to posts answer shortly.  I'm
> starting to think, though, that my problem is not DRBD, but my file
system
> after the reboot, which is confusing DRBD into thinking there's something
> new there to sync (right before the reboot they should have been
completely
> synced, so it shouldn't even need to do this)

DRBD knows nothing about your file system, it is a block device,
below the file system level.

With DRBD 0.6.X, whenever a Primary goes down, there has to be a
full sync.  Even if *you* know that nothing, or only "little", was
changed, DRBD has no way to know that. It only knows that the
primary vanished unexpectedly, and concludes it needs to sync...

> ....I think this would explain
> why my data is missing and my server is down....

I still don't understand what you mean with "my data is missing"...
Please give more detail about
what you are doing, and
what you expect to happen, and
where "real world" does not meet your expectations.

>       How destructive will it be if I kill the resync?

Not destructive at all...
Only next time the nodes connect, the full sync will start over
from the very beginning.

             Lars Ellenberg
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