RE: [OT] large tape backup

["Paul Gale" <groups@xxxxxxxxxxxxxxxx>]

Two beers from me for the one with good case ;)

Paul.



> -----Original Message-----
> From: Nigel Giddings [mailto:nigel.giddings@xxxxxxx]
> Sent: 19 March 2004 14:02
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] [OT] large tape backup
>
> Mark,
>
> I don't want to tread on anyone's toes but second dibs on a Compaq DLT
> 20/40Gb Wide SCSI would find a good home with me.
>
> There would be a beer in it for you as well at the UKHA 2004-03-19
>
> Nigel
>
> -----Original Message-----
> From: Mark Hallows [mailto:markhallows@xxxxxxx]
> Sent: 19 March 2004 12:51
> To: 'ukha_d@xxxxxxx'
> Subject: RE: [ukha_d] [OT] large tape backup
>
>
>
>
>
> >
> >But I need replaceable backup rather than HDD as I'd end up with
huge
> >stacks of HDD's! ?
>
> an Average project + 80GB's ?
> An ATAbaby = 1.2TB and = 1U
>
> reply;
> I have 2 safes full of AIT2 and AIT3 archive tapes and 5 ATAbabies
(5U)
> or 1
> x ATABoy2 (3U) could have done away with them all..mmmm
>
> eh?
>
> /confused/.....
>
> with tape, you'll end up with huge stacks of tapes.... - a DLT Tape is
a
>
> similar dimension to a 3.5" HDD...
>
> With tape, you can't just mount the thing and browse through it to see
> what's on it.. (you will of course be completely fastidious about
> writing
> the index card in the tape cartridge box won't you!)
>
> With tape you have a lengthy restore process to get the data back onto
> another machine before you can use it.
>
> With tape you have to have additional spare disk space available on a
> machine somewhere to be able to restore it.
>
> Tape drives are dearer (new DLT drive?, that will be 3.5 thousand of
> your
> english pounds, sir...) DLT tapes seem to be about ?70 each... - i.e.
> significantly dearer than a 120GB disk....
>
> Tape drives are (IMHO) less reliable than disk drives, - they are
highly
>
> mechanical with pulleys, arms, rubber belts, cogs and so on... heads
> need
> regular cleaning, backups have to be verified before you can trust
them
> (thus doubling backup time). OK, you can argue the same for disk
drives,
> but
>
> I would assert that these devices are in different leagues as far as
> mechanics are concerned...
>
> Tape storage is *not* indefinate... Tape stock degrades with both use
> and
> the passage of time. Tapes may not be readable a few years after
you've
> written them...
>
> Tape technology is constantly changing and being upgraded.... - you
just
>
> *try* to buy an original first generation DLT Tape nowadays (a 15/30)
-
> I
> looked for a year for a source of 15/30GB DLT tapes a while back with
no
>
> success... in the end I swapped the drive for some DLT IV tapes, since
I
> had
>
> ('have' actually, but more of that later*) a couple of newer 20/40GB
DLT
>
> drives that I inherited...
>
> * - If you _really_ want to go with tape, then you are more than
welcome
> to
> all of my tape hardware and media FOC... I have:
>
> 2 x DLT IV 20/40GB Compaq drives, one of which has some cosmetic
damage
> to
> the plastic bezel at the front. I have about 4 or 5 DLT IV tapes to go
> with
> them...
>
> A selection of DAT hardware (Can't actually remember what...) - I have
> about
>
> 3 or 4 DAT Drives, with a mixture of DDS1 and DDS2 standards, and
> several
> boxes of DAT tapes to go with each.. (some tapes are unopened). Some
of
> these drives are in external enclosures, some are bare drives that fit
a
>
> 5.25" drive bay...
>
> *ALL* the above are SCSI devices, - the DAT's are original (i.e.
> "narrow")
> and the DLT's are "wide" SCSI. I also have a selection of
both internal
> and
> external SCSI cables, and terminators etc.
>
> If you want any of this stuff, I could bring it along to UKHA2004 if
you
>
> want, - or you're welcome to pop over to my place & collect.....
>
> Any use?
>
> Paul G.
>
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