Timothy J Massey schrieb:
> Ralf Gross <Ralf-Lists AT ralfgross DOT de> wrote on 02/19/2010 10:42:35 AM:
> 
> > bit off topic:
> > Right now I'm looking for a cheap storage solution that is based
> > on supermicro chassis with 36 drive bays (server) or 45 drive bays
> > (expansion unit) in 4 HU. Frightening, that would be 810 TB in one
> > Rack (36 + 45 HDDs x 5 x 2 TB, 40 HU) with 5 servers. Only problem is
> > power, cooling and.... backup.
> 
> That's why companies like EMC and NetApp get big money for selling you 
> nearly the *exact* same hardware:  but with software and services designed 
> to handle things like...backup.
> 
> With storage sets of that size, there's really very little you can do 
> outside of snapshots, volume management and lots and lots of disk (and 
> chassis and processor and power and ...) redundancy.  Simply traversing a 
> file system of that size is going to take more time than you have for a 
> backup window.  If you want anything approaching daily backups, you can't 
> do it at the filesystem level.  :(
> 
> And even for things like off-site backup, it's far easier to have a 
> smaller version of your big array off-site and sync a snapshot 
> periodically (taking advantage of the logging/COW filesystem of the array 
> system) than it is to try to traverse an entire 800TB filesystem (or 
> multiple filesystems that add up to 800TB).

Your are absolutely right. I hope we will realize part of the storage
with eg. NetApp and only a small part with a cheap solution which
doesn't need backup or only in a "best effort" way.

The data is not changing much, most of the files just lie there and
will not be read again.

Ralf

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