Re: OpenVMS using RAID drives
From: David J Dachtera (djesys.nospam_at_comcast.net)
Date: 05/05/05
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Date: Wed, 04 May 2005 21:11:11 -0500
DL Phillips wrote:
>
> Bob Koehler wrote:
> > In article <KU5ee.4898$dT7.4627@news.cpqcorp.net>, Keith Parris
> <keithparris_NOSPAM@yahoo.com> writes:
> > > Bob Koehler wrote:
> > >> It depends on the version of VMS. Since your's has the silent
> Open
> > >> stuck on it, it almost certainly does support 2TB disks. Check
> the
> > >> SPD for your version (http://h18000.www1.hp.com/info/spd).
> > >
> > > In 5.5-2 and earlier versions, the volume size limit was 8 GB (8.5
> > > billion bytes). That was raised to 1 terabyte in V6.0. But sorry, 2
> TB
> > > is too big for support in any version of VMS at present. File
> system
> > > development work is required to raise this limit.
> >
> > Oops, I was thinking it was already in the 16TB range. I must
> have
> > been misremembering a storage demo that was actually several
> logical
> > volumes.
>
> Here's an actual quote from an HP OpenVMS engineer: "the feeling is
> that 1TB is sufficient."
More likely, the truth is that the limits of unsigned longwords have
been reached and now they'll have to invent a 64-bit integer datatype to
contain a sufficiently large number of 512-byte disk blocks to represent
the greatest possible extent of a single file that would fill such a
large volume.
If one is loath to use volume-sets (HBVS recommended for these!), or if
software constraints prohibit their use (Oracle chokes on 'em), then the
1TB limit may represent a "brick wall".
> Here are a couple of other quotes with which most of should be
> familiar:
>
> Bill Gates: "640K ought to be enough for anybody."
>
> Realising his error in time, Mr. Gates went on to build an empire by
> selling software that eats up memory by the Mega- and GigaByte.
>
> Ken Olson: "There is no reason for any individual to have a computer in
> their home."
>
> By not realising his error in time, Mr. Olson's company was overtaken
> by those who could see a reason.
>
> Nuff Said?
Not quite yet.
OpenVMS Engineering (et al): VMS for (IA32, x86-64) cannot compete with
alternative operating systems; the market for such would be so limited
as to prevent recovery of the development investment.
Such nay-sayers have yet to see the error of their ways, though it will
likely dawn on them as they clean out their desks for last time when VMS
finally falls victim to such lack of vision.
-- David J Dachtera dba DJE Systems http://www.djesys.com/ Unofficial OpenVMS Hobbyist Support Page: http://www.djesys.com/vms/support/ Unofficial Affordable OpenVMS Home Page: http://www.djesys.com/vms/soho/ Unofficial OpenVMS-IA32 Home Page: http://www.djesys.com/vms/ia32/ Coming soon: Unofficial OpenVMS Marketing Home Page
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