Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Alex wrote: >>> yes, thats why i want to use drbd, to replace raid1 limitations and group >>> computerX two by two. In this scenario, remain just one question: how can >>> i join together /dev/drbd*, or....if this thing is not possible, the >>> question is: how can i join together all 8 volX in order to have: >>> - Fault-tolerance: Failure of a single drive (volX) or server (computerX) >>> should not bring down the GFS! >>> >> This isn't the limit of GFS. You can't use DRBD with iSCSI or GNBD >> because DRBD support only two nodes and You have eight. >> > > Yes i have 8 nodes but only 4 /dev/drbdX devices, where X={1,2,3,4} are > mirroring each two nodes... > So, You can create 4 GFS fs on the top of DRBD devices[1] > >> GFS need shared storage(SAN) - one raw device which could be visible on >> the few nodes. >> > > Using iscsi i can export /dev/drbdX which will be visible by all M servers as > raw devices as you say. With lvm i can unify all /dev/drbdX in a logical > volume and run GFS on top. Why will not work? Is a drbd limitation? > > Why You want to build it such way? This is complex configuration and it won't work, because from what I know LVM need 3 devices(one for metadata)[2], and here is the problem to build true HA configuration. [1] - http://www.drbd.org/users-guide/ch-gfs.html [2] - http://www.redhat.com/docs/manuals/csgfs/browse/4.6/Cluster_Logical_Volume_Manager/mirror_create.html Best Regards Maciej Bogucki