I did some timings regarding DDS3 capacities and speeds (and part
numbers:)) a while back.
Look in the Archives at http://raven.utc.edu/archives/hp3000-l.html and
search for DDS3.

Since then, we have attached four DDS3 drives to a 959/400 and the
client uses these to back up in parallel (Turbostore).
Here are some statistics:- 43.9 GB in 1Hr34Min. with what looks like a
quarter of real capacity used.(The 43GB compresses to 12.9GB).

:store
@[log in to unmask]@;;storeset=(*d1),(*d2),(*d3),(*d4);directory;progress;statistics;co
mpress=high

 BACKUP STATISTICS

 DATA WRITTEN

 SET 1      FILE DATA     MISC DATA     COMPRESSED     TOTAL ON REEL
 MEDIA  1 | 10764549448  |   21260476  | 2908272440  | 2929532916

 SET 2      FILE DATA     MISC DATA     COMPRESSED     TOTAL ON REEL
 MEDIA  1 | 10334840652  |   11641456  | 3247271224  | 3258912680

 SET 3      FILE DATA     MISC DATA     COMPRESSED     TOTAL ON REEL
 MEDIA  1 | 11096610288  |   25067024  | 3733451056  | 3758518080

 SET 4      FILE DATA     MISC DATA     COMPRESSED     TOTAL ON REEL
 MEDIA  1 | 11762423976  |   66688536  | 2903903848  | 2970592384

 SET TOTALS

 SET  1   | 10764549448  |   21260476  | 2908272440  | 2929532916
 SET  2   | 10334840652  |   11641456  | 3247271224  | 3258912680
 SET  3   | 11096610288  |   25067024  | 3733451056  | 3758518080
 SET  4   | 11762423976  |   66688536  | 2903903848  | 2970592384
 ---------+-------------+-------------+-------------+-------------
 BACKUP
 TOTAL      43958424364     124657492    12792898568    12917556060

 THROUGHPUT MEDIA START TIME   MEDIA END TIME    THROUGHPUT (K/S)
RETRIES
 SET 1      7:18 PM            8:38 PM            593 K/S         0
 SET 2      7:18 PM            8:24 PM            796 K/S         0
 SET 3      7:18 PM            8:38 PM            767 K/S         0
 SET 4      7:18 PM            8:52 PM            514 K/S         0
 TOTAL ELAPSED TIME: 1 hours, 34 minutes, 0 seconds

 COMPRESSION

             FILE DATA     COMPRESSED    RATIO     PERCENTAGE
 SET 1      10764549448   2908272440   3.7:1       73%
 SET 2      10334840652   3247271224   3.2:1       69%
 SET 3      11096610288   3733451056   3.0:1       66%
 SET 4      11762423976   2903903848   4.1:1       75%

 TOTAL      43958424364  12792898568   3.4:1       71%


Regards

Neil


> -----Original Message-----
> From: James Trudeau [SMTP:[log in to unmask]]
> Sent: Friday, March 13, 1998 12:02 AM
> To:   [log in to unmask]
> Subject:      Re: 120M Tapes In DDS-2 -Reply
>
> ----------
> From:   Wayne, Roby
> Sent:   Thursday, March 12, 1998 3:20 PM
> To:     [log in to unmask]
> Subject:        Re: 120M Tapes In DDS-2 -Reply
>
> We just upgraded from a C1503B DDS to a C1504B DDS2, supposedly.  Do
> these "little babies" support 120m tapes?  So far, we haven't seen any
> marked improvement in the upgrade.
>
> C'est la vie.
>
> Roby
> ----------------------------------------------------------------------
> --------------------------------
> Wayne,
>
> Beats me.  We're running 2 C1533 (according to the label) drives.
> They handle 120M and 90M co-mingled tapes quite nicely.
> Takes a bit under 60 minutes to Turbostore 5GB or so driving
> them in paralell from their own dedicated SCSI card on a 987.
> Tape length doesn't make any difference in peformance, just
> how much you can jam on one tape.
>
>       We have some other model DDSII drive on a 9000 but don't have
>       much experiance with it, seems 'bout the same though.  We
>       also have a DLT drive on the 9k.  If you need performance, get
>       some $$$ and get one.  We get about 2GB in just over 10
>       minutes.   Don't forget the $150 per tape for that DLT drive.
>
>        Don't know about DDS3.  Anyone care to chime in on that?
>
>        jt