[DRBD-user] Primary device hangs when syncing with secondary

Lars Ellenberg Lars.Ellenberg at linbit.com
Wed Jun 2 21:45:22 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.

/ 2004-06-02 11:48:39 -0700
\ Sean Dwyer:
> I have replication set up between two boxes with drbd over a crossover
> cable using protocol C. I have /dev/nb0 mounted at /mnt/nb0 on the
> primary box, which is then shared via Samba3. I've been testing the
> setup with an app on a third box running Win2K that creates random
> files on the Samba share as fast as it can.
> In order to simulate a failure, I tried rebooting the drbd secondary
> box. The problem is that when the secondary comes back up and drbd
> initiates a sync, the Samba share seems to hang (i.e. the app on the
> Win2K box can't create any files) until the syncing completes. Is this
> normal?
> From what I've read, the drbd device on the primary should perform
> normally during a sync.

well, not exactly "normally".
resynchronization is, depending on your settings for sync-{min,max,nice}
considerable load on the system... maybe the samba server just is that
slow accessing the device (because the sync is that high in priority)
that the resync finishes before the samba managed to get its requests

play with those sync settings.

	Lars Ellenberg

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