[DRBD-user] [DRBD-announce] drbd-8.3.3.tar.gz

Lars Ellenberg lars.ellenberg at linbit.com
Wed Oct 7 10:12:33 CEST 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 Tue, Oct 06, 2009 at 02:31:40PM +0200, Rainer Traut wrote:
> Lars Ellenberg schrieb:
>> On Tue, Oct 06, 2009 at 12:53:20PM +0200, Rainer Traut wrote:
>>> I see this in dmesg with 8.3.3 and RHEL5.4 x86_64:
>>> block drbd1: write: error=-95 s=5767576s
>>> block drbd1: Method to ensure write ordering: flush
>>> while in earlier drbd version 8.3.2:
>>> kernel: block drbd1: Method to ensure write ordering: barrier
>>> Anything to be concerned?
>> Nope.
>> 95 is EOPNOTSUPP, barriers seem to be not supported on your lower level
>> device, so DRBD falls back to "flush" mode.
>> which, because implemented as "empty barriers" probably fail as well,
>> so I guess it falls back further to "drain" mode pretty quickly.
>> That should be no different between 8.3.2 and 8.3.3, though.
> Yeah, nevertheless this has changed between 8.3.2 and 8.3.3 - only  
> change was drbd update.
> Sys: kernel 2.6.18-164.2.1.el5 x86_64
> drbd on top of LVM:
> device          /dev/drbd1;
> disk            /dev/VG00/LVvm1slash;

I'm _very_ certain that, if you go back to 8.3.2, you'd see the same
behaviour, and most likely it has been that way before, as well,
or the upgrade was _not_ the only change, but you changed some
kernel as well, or you changed the layout of your LV (lvextent?

Anyways: no worries.

: Lars Ellenberg                
: LINBIT HA-Solutions GmbH
: DRBD®/HA support and consulting    http://www.linbit.com

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