[DRBD-user] primary/primary with ext2 not updating real-time

Graham Wood drbd at spam.dragonhold.org
Wed Feb 27 18:32:49 CET 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


----- Message from theophanis_kontogiannis at yahoo.gr ---------
> I am a bit confused since I believed that GFS itself, groups together in a
> single large file system, physical disk space, spread in the network.
>
> But it really does this or not (in which case we need DRBD)?
GFS requires an underlying block device that is accessable to all  
nodes.  You can do this via GNBD (which does something similar to  
DRBD, but in a different way), but you still need SOMETHING to do that.

The way to look at it is as a layered arrangement.  To have a shared  
filesystem you need a shared block device and a shared filesystem:

Shared Block Devices:
   SAN
   Dual attached SCSI
   GNBD
   DRBD
   iSCSI

Shared Filesystem:
   gfs
   gfs2
   gpfs
   ocfs
   ocfs2

----

There are probably more options for both, but the important thing to  
remember is that you need BOTH to get a truely shared filesystem.

Graham



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