Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi Mario, this is a design issue. Doing the replication on the target has its disadvantages. If you want to have the read balancing feature, then you would have to move the replication to the initiator (e.g. by using MD RAID-1). You need symmetric (same) latency to both replica. Actually, DRBD in Primary-Secondary with iSCSI has better read than write performance - but only as writes are damn slow as you have chained network paths instead of parallel ones. Please have a look at the last slide of my presentation on LinuxTag this year. There you can see the issue: http://de.slideshare.net/SebastianRiemer/infini-band-rdmaforstoragesrpvsiser-21791250 We've hacked MD RAID-1 for high-performance replication. Cheers, Sebastian -- Sebastian Riemer Senior Linux Kernel Developer - Storage at ProfitBricks On 25.08.2013 14:35, ml ml wrote: > Hello list! > I am using xen with drbd which is attached to two iscsi targets. > > On normal hardware raid controllers the read is done from two disks ( so > u get about twice the read performance). > > Does Drbd support this? (reading from secondary over the network) > > Thanks, > Mario