On Apr 23, 2007 07:05 -0400, Brian J. Murrell wrote: > On Mon, 2007-23-04 at 12:56 +0200, Hans Einar Gautun wrote: > > I want to have a local /dev/sdaX on each OST - with same size. That > > means: > > > > ost1 with its own /dev/sda3 > > in an active/active failover with > > ost2 with its own /dev/sda3 > > > > Is this possible, or have I misunderstanded something? > > The purpose of failover is so that two OSSes can provide the same > service to the lustre network. That is, should one of the two nodes > fail (i.e. a piano falls on it and completely destroys it), the other > OSS can provide exactly the same services. > > So you have to ask yourself, if you have a local disk in each machine > and one machine gets crushed under a piano, how does other machine > provide service from the crushed machine's disk? > > There are two solutions. Use a network replication service like drbd > (so that the contents of the local disks is identical at all times) or > use an external storage system that both OSSes can access, like FC SCSI > or Firewire, etc.
And sometime in the future Lustre will support OST-level RAID, but that is still some ways away. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. _______________________________________________ Lustre-discuss mailing list [email protected] https://mail.clusterfs.com/mailman/listinfo/lustre-discuss
