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;
Rainer
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