Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
I have a drbd (drbd 0.7.19) setup on Centos 3.7 with software raid
Everything is Ok but I have hundreds of messages of this type in the log
file
Jul 24 11:49:31 mail01 kernel: raid5: switching cache buffer size, 4096 --> 512
Jul 24 11:49:31 mail01 kernel: raid5: switching cache buffer size, 512 --> 4096
Jul 24 11:49:31 mail01 kernel: raid5: switching cache buffer size, 4096 --> 512
Jul 24 11:49:31 mail01 kernel: raid5: switching cache buffer size, 512 --> 4096
Jul 24 11:49:31 mail01 kernel: raid5: switching cache buffer size, 0 --> 4096
The messages are much more frequent on the primary node, but occasionally I also see them on the secondary node
I understand that this continous switching reduces performance quite a lot.
Can anyone suggest why this is happening?
my drbd.conf file:
resource r0 {
protocol C;
incon-degr-cmd "echo '!DRBD! pri on incon-degr' | wall ; sleep 60 ;
halt -f";
startup {
degr-wfc-timeout 15; # 2 minutes.
}
disk {
on-io-error detach;
}
net {
max-buffers 4096;
}
syncer {
rate 70M;
group 1;
al-extents 257;
}
on mail01.domain.loc {
device /dev/drbd0;
disk /dev/md3;
address 10.3.0.1:7788;
meta-disk internal;
}
on mail02.domain.loc {
device /dev/drbd0;
disk /dev/md3;
address 10.3.0.2:7788;
meta-disk internal;
}
}
--
------------------------------------------------------------------------
/Ove Fredrik Thoresen /
<mailto:othoresen at yayamedia.it>othoresen at yayamedia dot it