Can you tell us please the publication number on that report?  I would
like to get a copy.

>----------
>From:  Mark Rizzo[SMTP:RizzoM AT mail.dec DOT com]
>Sent:  Tuesday, April 01, 1997 9:32 AM
>To:    ADSM-L AT VM.MARIST DOT EDU
>Subject:       Re: tape storage vs. disk storage
>
>Ron,
>
>Did you say "counter-intuitive"? Well that's exactly how we felt until
>we
>got our hands on a document titled, ADSTAR Distributed Storage Manager
>Version 2 Release 1.5 Performance Evaluation Report. This report
>reinforced
>our findings exactly (pages 43-44). I/O rate increased 3X - 4X when
>writing directly
>to the 3590 tape drive. IBM reports this is no mystery or illusion,
>3590's stream
>the data where disks can't. Go figure.
>
>Mark RIzzo
>DOD
>rizzom AT mail.dec DOT com
>
>PS. No migration involved.
>
>>----------
>>From:  Clendenny, Ronald D.[SMTP:rdclendenny AT CAL.UE DOT COM]
>>Sent:  Monday, March 31, 1997 4:34 AM
>>To:    ADSM-L AT VM.MARIST DOT EDU
>>Subject:       Re: tape storage vs. disk storage
>>
>>Now why would there be an increase in the data transfer rate going
>>direct to tape?  That seems counter-intuitive.  Was migration competing
>>with the backup?
>>
>>Ron Clendenny  <rdclendenny AT cal.ue DOT com>
>>Callaway Nuclear Power Plant
>>Fulton, Missouri
>>
>>"The difference between a madman and me is that I am not mad" - Salvador
>>Dali
>>
>>>-----Original Message-----
>>>From:  Mark Rizzo [SMTP:RizzoM AT MAIL.DEC DOT COM]
>>>Sent:  Thursday, March 27, 1997 1:04 PM
>>>To:    ADSM-L AT VM.MARIST DOT EDU
>>>Subject:       Re: tape storage vs. disk storage
>>>
>>>Michael,
>>>
>>>You can go directly to your tape drive but you must realize, your
>>>backups/archives will backup (queue) if you don't have enough tape
>>>drives.
>>>While a disk backup pool can handle many backups at once, a direct
>>>to tape backup must wait it's turn. One thing we did discover regarding
>>>direct to tape backup, was a tremendous increase in data transfer rate.
>>>Going to our disk pool we averaged 700kb/sec. But when we directed the
>>>data to our tape pool, we got 3Mb/sec..(3590 tape drives)
>>>
>>>Mark Rizzo
>>>DoD
>>>
>>>
>>>>> From:         Michael Castillo[SMTP:mcastill AT UTEP DOT EDU]
>>>>> Sent:         Tuesday, March 25, 1997 11:37 AM
>>>>> To:   ADSM-L AT VM.MARIST DOT EDU
>>>>> Subject:      tape storage vs. disk storage
>>>>>
>>>>>         Does anyone out there just dump to tape only and not store
>>>>> data on
>>>>> disk(ex.3390,3380)? Can this be done?
>>>>>
>>>>>
>>>>>
>>>>> Michael A.Castillo
>>>>> Software Systems Specialist
>>>>> Ph:747-5256
>>>>> Fax:747-5067
>>>>> Beeper :546-3756
>>>>> E-Mail: mcastill AT utep DOT edu
>>>>>
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>>
>