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