Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi, On 03/27/2012 04:24 PM, Jakob Curdes wrote: > Not sure which mail you mean, the one with the active-active setup? It > seems to me that this is a different issue. > In the case here I would suspect that drbd in some way manages to block > the mysql tables - but how, with innodb and only reading at a rate way > below the disk speed? > We are now trying to reproduce this, but it requires setting up the > complete database application to simulate the DB load. One point to note this reminds me: Have you tried fiddling with the no-disk-barriers option? I've heard a remark about how barriers in the I/O layer don't play well with InnoDB, because it has its own barriers in place. But then, I don't have a good understanding of how DRBD barriers work. > is that it is not only the database access; we see high IOWaits during > sync - even with very low sync speeds.