Re: drdb and mdadm and more (was Re: mail storage in a distributed database)

Russell Coker wrote:

Some people claim that RAID bitmaps hurt performance

So does journalling, but they're both still good ideas -- at least in typical use cases. I had problems a while back, but they turned out to be 100% caused by collectd's pathological write workload (lots of RRDs). Cranking the buffering of those up to 1hr fixed that, and the -binternal overhead turned out to be negligible.