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Re: [linux-lvm] Backup costs (was: LVM reimplementationre)



I just bought 10TB for $4.5/GB.  That's 5 4U systems, each with 16 160GB
drives and one GigE interface.  A couple similar systems in my lab (14
100GB drives) benchmark at 110 MB/sec reading, 85 MB/sec writing with
software RAID5.  With NFS over GigE, I can get 50 MB/sec sustained before
PCI bus contention starts to be a problem.

You can almost certainly spend less money if you try hard enough, but I
wanted systems that wouldn't need 24x7 handholding :-).


Scott

On Thu, 7 Feb 2002, Richard Barbara wrote:
>
> Does anyone have an opinion as to what the cost of storage should be (say
> in $ /Gbyte) to enable wider use of 'direct to disk' backup?
> Would tape emulation help in this issue?
>
> ----------
> > From: Jeff Layton <laytonjb bellsouth net>
> > To: linux-lvm sistina com
> > Subject: Re: [linux-lvm] Backup costs (was: LVM reimplementationre)
> > Date: Thursday, 7 February 2002 13:04
> >
> > James Mello wrote:
> >
> > > >    Large amounts of data brings in even more issues. How do
> > > > you stream Petabytes of data to tape in a resonable of time?
> > > > Unless you spend HUGE amounts of money to buy multiple
> > > > silos to handle slices of the data and put in a fantastic network
> > > > to handle the traffic, you can't backup in a reasonable amount
> > > > of time. In this case, disk is your only choice. The data size
> > > > break point between disk and tape depends on lots of things,
> > > > but that point is moving downward all the time (perhaps in
> > > > the Terabyte range).
> > >
> > > Petabytes are another matter entirely. If you must absolutely have that
> > > much data backed up, you start looking at more exotic solutions.
> Backing
> > > up solely to disk is *way* to expensive, hence the wonderful, but of
> > > poorly implemented idea of HSM.... Disk and tape :)
> >
> > Yes, HSM has never panned out the way it was supposed to.
> > However, try backing up Petabytes with tape in a reasonable
> > amount of time. While I've never configure such a system,
> > the numbers from systems I have seen indicate that disk is
> > much cheaper than tape (even if tape is a feasible solution
> > because of speed).
> >
> > Jeff
> >
> >
> > >
> > >         -- Cheers
> > >         -- James
> > >
> > > _______________________________________________
> > > linux-lvm mailing list
> > > linux-lvm sistina com
> > > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
> >
> >
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm sistina com
> > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
>
> _______________________________________________
> linux-lvm mailing list
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> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
>




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