Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
>I seem to be having a problem with load. I have four servers. > >Two are web servers and the other two are MySQL (Master - Master >Replication) and NFS servers. Between the two SQL, I have DRBD running >in Active / Passive setup. So MySQL is Master/Master, but drbd is Active/Passive? What is writing to drbd? > On the passive DRBD machine, I find that, >when I do a 10GB Mylvmbackup of Mysql DB, the load on the two webservers >go through the roof. > >My question is, could it be the syncing of DRDB and IO wait, that is the >reason for this. Or how could I rule out DRDB as the culprit. > >If anyone could help it would be appreciated. If drbd is active/passive, then you aren't mounting the secondary repl partner therefore it's not critical for the operation: Stop it and run your test evaluating load... You can also use tools like iostat to determine whats being written to with what parameters.