[Beowulf] Big storage
jakob at unthought.net
Fri Aug 24 04:53:42 EDT 2007
On Thu, Aug 23, 2007 at 11:02:28AM -0400, Jeff Blasius wrote:
> Hello Jakob,
> A couple of things...
> 1. ClusterFS has an easy to understand calculation on why raid 6 is
> necessary for the amount of disks you're considering. You do need to
> plan for multi-disk failure, especially with the rebuild time of 1TB
As Greg pointed out, if I can live with isolated filesystems (many small RAID
sets), there's a lot of problems with very big arrays that won't affect this
That said, RAID 6 is probably very interesting to consider anyway.
> 2. Avoid tape if you can. At this scale, the administrative time and
> costs far outweigh the benefits. Of course if you need to move your
> data to a secure vault that's another thing. If you really want to do
> tape, some people choose to do disk > disk > tape. This eliminates the
> read interrupts on the primary storage and provides some added
So far I've been surprised at the number of people who (mainly privately) has
told me to stay away from tape - that was unexpected, but interesting
> 3. We do use Nexsan's satabeasts for storage similar to this. Without
> commenting on costs, the jackrabbit is technologically superior.
Thanks a lot for the comments!
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