Roy J. Tellason
rtellason at verizon.net
Thu Apr 24 17:07:21 CDT 2008
On Thursday 24 April 2008 17:34, Chuck Guzis wrote:
> > Date: Thu, 24 Apr 2008 14:20:17 -0400
> > From: "Roy J. Tellason"
> > I saw some conversation going by in here recently about Exabyte drives,
> > only the numbers don't sound anything like what I have, which is marked
> > "Model: HH CTS". There are all sorts of other numbers on there, for
> > various aspects of it.
> Most Exabyte drives have model numbers of the form 8xxx, from 8000 to
> 8900, then the "Mammoth" models. The basic early 8200 will hold
> about 2.1G on a standard 8mm tape. Later models require different
> tapes to take advantage of larger capacities.
> Quality of the drives are all over the place, from the built-like-a-
> brick-outhouse 8200 and 8500 to the cheap-hunk-of-plastic 8700.
These were a part of an IBM box, SSA? Something like that. LOTS of hard
drives in there, and some sort of a serial link (loop?) to the computer(s).
> > I'm told that these hold 20G on a tape. The guy I got 'em from
> > unfortunately doesn't have any tapes to go along with them. One of those
> > tapes would back up pretty much of what I have on my LAN here, or whole
> > machines, as they sit. I'm guessing that the interface I'll be looking
> > at after I take it off of the current mounting plate will be SCSI-wide,
> > like the CD drives and some of the other stuff I have with it.
> I suspect that that's 20G "compressed", which is the equivalent of
> "Chinese electric motor horsepower", i.e. extremely optimistic.
Might be, might not, I dunno.
> > Think I can get 'em going under linux? :-)
> Sure--just be certain that the SCSI "flavor" matches what you've got
> on your controller.
The CDROM drives that were in the same box have a pretty standard 68-pin
connector on the back of 'em that looks to be a good match for some of my
> The general idea is that any SCSI tape drive that supports the
> standard command set will work with Linux--and probably many other
> platforms. It's been too long since I did "anybody's SCSI tape
> backup" software, but the only gotchas are packages that use
> nonstandard behavior such as read-after-write or strange varieities
> of tapemarks. Heck, even the command set for auto-changers is
> standard, being applicable to a little magazine that sits in your
> tape drive to a bunch of robots crusing racks of 1/2" reel-to-reel
> tapes. At least in theory, you can use anything from a 1/2" reel-to-
> reel drive to a DLT without changing software.
I have a couple of boxes of assorted tapes, and a changer of some sort would
sure go a long ways toward removing the tedium out of backing up using those.
Biggest ones in the bunch though are about 256MB, if I'm remembering right.
> Most SCSI tape drives feature read-after-write verification, which
> puts them way above the garden variety consumer "floppy tapes", most
> of which were garbage, IMOHO.
Got a few of those drives around too, and none of them are installed in
anything. And tapes to go with 'em. A Colorado, and a Conner I think.
Maybe another one, I'm not sure.
> While not as good as DLT, 8mm is head-and-shoulders above 4mm DAT as
> concerns reliability. The bottom of the barrel, IMOHO, was the
> Datasonix Pereos 2.5mm format.
I don't think I've ever run across that one.
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