Hello everyone,first of all, I know DRBD 0.7.22 is WAY outdated! Still, this is the only Novell-supported version for SLES10SP3 currently. Thus I would like to solve the problem with this version if possible somehow... :-)
So the problem we have is the following:There are periodic IO load spikes that are causing the system to seriously hang for a couple of seconds.
We have been running 'sar' for a couple of days and just now discovered that the peaks disappear when we stop the DRBD service. There are exactly 18 peaks an hour, which make for a period of exactly 200 seconds between the peaks. The peaks happen on BOTH, primary and secondary node. So we stopped DRBD on the secondary node and the peaks went away there.
Unfortunately the 2.6.16 kernel of SLES10SP3 does not allow for process wise IO statistics, e.g. the program 'iotop' is not available. Hence we only have IO stats for the whole system.
Please find a graph from 'isag' attached which shows the periodic peaks.
This is our very basic drbd.conf:
--------
resource r0 {
protocol C;
on pollux {
device /dev/drbd0;
disk /dev/sda1;
address 10.0.0.1:7788;
meta-disk internal;
}
on castor {
device /dev/drbd0;
disk /dev/sda1;
address 10.0.0.2:7788;
meta-disk internal;
}
syncer {
rate 24M;
}
--------
I would be grateful for any help with 0.7.22 :-)
<<attachment: isag-snapshot.png>>
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