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 04/03/2012 11:53 AM, Lukas Gradl wrote: > For use with KVM with automatic failover I need a primary/primary setup, > so AFAIK protocol C is required. For dual-primary it is required, yes. You do need dual-primary for live migrations. You do *not* need it for automatic failover (in failure scenarios, live migration won't do you any good, anyway). If live migration isn't an issue for you, single-primary is perfectly fine! You still want protocol C though :-) > According to my benchmarks DRBD is much slower in that setup than native > HDD performance and changing the Network-Setup from 1GBit direct link to > 2 bonded interfaces doesn't increase speed. Have you identified the exact bottleneck inside your DRBD setup? Have you done analysis according to http://www.drbd.org/users-guide/ch-benchmark.html? > What do the experts think: Should this be sufficient to get the > perfomance of a single SATA-Disk without DRBD? I don't really feel addressed ;-) but here's my 2 cents: If DRBD performance with rotational disks is dissatisfactory, I wouldn't count on faster disks somehow solving the problem. You *may* save enough latency to make the setup worthwhile, but myself, I'd rather keep trying to root out the main problem. Throwing SSDs at a slow setup in order to make it a mediocre setup seems awfully wasteful to me. Cheers, Felix