From: <ron@ronnatalie.com>
To: "'The Unix Heritage Society'" <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] Someone wants to use an exabyte
Date: Mon, 25 Nov 2019 16:11:34 -0500 [thread overview]
Message-ID: <125201d5a3d4$eb504c00$c1f0e400$@ronnatalie.com> (raw)
In-Reply-To: <CAC0cEp_aAiGe03uqbZJvgb50U4Xu5DVaypG7KBao+Lp02XVfBA@mail.gmail.com>
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Our problem wasn’t so much that the Exabyte tapes would go bad as the drives themselves would keel over on a regular basis. It’s pretty much what drove us away from them. The intelligence community did a lot of studies on archival storage devices. The fundamental truth was to keep refreshed in the online domain rather than spending ages on static media.
From: TUHS <tuhs-bounces@minnie.tuhs.org> On Behalf Of John P. Linderman
Sent: Monday, November 25, 2019 4:08 PM
To: Arthur Krewat <krewat@kilonet.net>
Cc: The Unix Heritage Society <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] Someone wants to use an exabyte
I'm not an expert on mag tapes, but it makes sense to me that 9-track tapes, where the tracks "line up" when the tape is wound onto a reel, suffer more "print-through" than helical scan tapes, where tracks are not aligned with those under them on a reel. I recall a suggestion that 9-track tapes should be mounted and rewound once in a while, to reduce print-through. We used Exabytes for disk backups for years, back when tape capacity exceeded disk capacity. I doubt I'll see that again, but, as noted I'm not an expert on mag tapes.
On Mon, Nov 25, 2019 at 1:35 PM Arthur Krewat <krewat@kilonet.net <mailto:krewat@kilonet.net> > wrote:
On 11/25/2019 12:45 PM, Larry McVoy wrote:
> On Mon, Nov 25, 2019 at 12:40:22PM -0500, Arthur Krewat wrote:
>> PS: DAT 4mm tape drives, especially whatever Sun was using, were awful.
> It's no secret that I enjoyed my years at Sun, but I can't defend these
> drives, I had the same experience. When I look back on it, the only
> tapes that I remember being reliable where the 9 track reel to reel
> and the QIC-150. Once it got to GB sized tapes, everything seemed
> like crap.
>
The Exabyte 5GB and up stuff was pretty good. LTOs, after having worked
with them for the past 13 years, I can definitely say, are quit awesome.
DLT tapes and especially robots, well, it took HP about 5 years to get
the firmware right for a certain robot, the model of which, I don't
recall ...
art k.
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next prev parent reply other threads:[~2019-11-25 21:11 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-24 22:39 Richard Salz
2019-11-24 22:50 ` Jim Capp
2019-11-24 22:52 ` Larry McVoy
2019-11-24 22:58 ` Rico Pajarola
2019-11-24 23:45 ` Clem Cole
2019-11-25 1:41 ` Dave Horsfall
2019-11-25 1:42 ` George Michaelson
2019-11-25 3:24 ` Larry McVoy
2019-11-25 17:07 ` Al Kossow
2019-11-25 17:40 ` Arthur Krewat
2019-11-25 17:45 ` Larry McVoy
2019-11-25 17:49 ` Jon Steinhart
2019-11-25 18:34 ` Arthur Krewat
2019-11-25 21:08 ` John P. Linderman
2019-11-25 21:11 ` ron [this message]
2019-11-25 21:30 ` John P. Linderman
2019-11-25 21:38 ` Dave Horsfall
2019-11-25 18:29 ` Warner Losh
2019-11-25 3:29 ` Dave Horsfall
2019-11-25 3:34 ` [TUHS] Someone wants to use an exabyte [ really bulk erasing ] Jon Steinhart
2019-11-25 3:59 ` William Pechter
2019-11-25 15:25 ` Clem Cole
2019-11-25 17:13 ` Al Kossow
2019-11-25 4:53 ` Dave Horsfall
2019-11-25 3:36 ` [TUHS] Someone wants to use an exabyte Larry McVoy
2019-11-25 22:34 ` Dave Horsfall
2019-11-26 1:38 ` Lawrence Stewart
2019-11-25 22:46 ` Dennis Boone
2019-11-25 22:57 ` Henry Bent
2019-11-27 19:31 ` John Foust
2019-11-27 20:56 ` Arthur Krewat
2019-11-27 21:25 ` Dave Horsfall
2019-11-25 18:12 Norman Wilson
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