[Pvfs2-users] Question about redundancy

[Rob Ross]

GPFS has a facility for replicating data (mirroring), but in their 
documentation they suggest that you use RAID as your primary redundancy 
mechanism (at least in this copy of the docs):
 
http://publib.boulder.ibm.com/infocenter/clresctr/vxrx/index.jsp?topic=/com.ibm.cluster.gpfs.doc/gpfs31/bl1ins1122.html

Write speed obviously depends highly on the disks in your system, the 
speed of your nodes, the speed if your network connections, and the 
quality of your switch.

Regards,

Rob

Erich Weiler wrote:
>> There is no in-built redundancy yet. Unless you setup something like 
>> drbd.
>> Hope you find this information useful.
>> Do keep us posted.
> 
> Hmmm...  Having a failover to shared storage would be OK but would 
> involve procuring 80TB of shared storage...  Of course I could use 
> node1-100 for filesystem1 and node101-200 for filesystem2 (some kind of 
> drbd implementation).  Weighing this against IBM's gpfs, which ain't 
> free but they have a bit better redundancy I think...  Any notes on 
> performance?  Has anyone tested write speed of say, 3TB or something?
> 
> -erich
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