Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Dominik Klein schrieb: >> I just want to replicate a SAN (array, disk etc.) to another physical >> location. > > Then you don't need heartbeat and drbd will do just fine. > >> There is no sense in using heartbeat for me, as when that primary SAN >> dies, the asymmetric link from another datacenter will be too slow >> anyway to provide services. > > Then you just want a data backup. Okay - drbd can do that for you. You > might want something that checks the device, connection and network > status, though. No, it's not data backup. RAID-1 is essentially not backup ;) Backup will be done somewhere else. Let's say we have two datacenters and two SAN machines there. Data is written to and read only in datacenter_1; at the same time, everything is replicated to a SAN in datacenter_2. It's some sort of assurance that when the datacenter_1 burns down to ground or gets flooded, it shouldn't take longer than a few hours to start all the services again in datacenter_2. It's much faster that way than having to restore the last backups from tapes, decompress, write where it belongs etc. -- Tomasz Chmielewski http://wpkg.org