Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Mark, iSCSI simply makes your external device appear to the OS as a SCSI device (/dev/sdX), even though it is actually connected through a network connection. You need whatever the driver for you iSCSI device to be supported on the flavor of linux that you will run. You will then install drbd on each of the servers and then in drbd.conf, you will use the /dev/sdX device names corresponding to your iSCSI devices on each server. That should be all you need to do. I have not done this myself, so do not know if there are any complications or performance hits (other than you can only communicate to each iSCSI device at about 120MB/s which is the gigabit bandwitch limit). You should probably be better off putting the external metadata locally on one of the server internal drives. Remember to only create a file system on the drbd device /dev/drbd0, rather than on the iSCSI devices /dev/sdX It would probably be highly advisable to use a cross-over cable and a dedicated gigabit card to connect your external array to each server, use a second card for drbd and yet a third network card to connect to the network and all the client machines. If that is not possible, then at least 2 cards, one for the network, then one for drbd is a must. HTH, Diego Mark Olliver wrote: > Hi, > > I am looking at purchasing an iscsi device to use with my system. I have used > drbd before and would like to have the iscsi device drbd some of its disks to > another remote iscsi device. I have seen some posts saying that this is > possible but I am a little confused as to how. (mainly due to my lack of > knowledge as to how iscsi works). > > I am looking initially to use Promise Vtrak M200i devices as the iscsi > devices. These will then each be connected to their own linux servers. It it > those servers which will be mounting the drbd drives. > > What I don't know is would I have to install drbd onto the promise device (if > so does anyone know if this is possible). Or can I server up disks from the > iscsi to the server as for example /dev/had and then let the server do the > drbd. > > Thanks for you help in my understanding in advance :) > > Mark > > Mark Olliver BSc (Hons) MBCS > Thermeon Europe Ltd > > > e-Card www.thermeoneurope.com/e-Card/mpo > > Email mpo at thermeoneurope.com > Web www.thermeoneurope.com > > Support 0906 515 0908 > Int. Support +44 1293 864 341 > Support Email support at thermeoneurope.com Support Site > www.thermeoneurope.com/rt > > Sales +44 1293 864 334 > Sales Email sales at thermeoneurope.com > > > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user