No problem. Of course, YMMV. Your disk array could prove a limiting factor
in maximizing tape drive throughput, for instance. Also, max speeds are
streaming; saving/restoring lots of small objects achieves streaming speed
less than fewer-but-bigger. And compressing your save via SAVLIB
DTACPR(*MEDIUM) can shove more data through that pipe so while the tape
drive take 120MB/s you can actually get 200+MB/s throughput if the system
compresses the data before sending it to the tape drive.

As with anything tech-related, there are lots of variables. :)

On Thu, Apr 7, 2011 at 12:05 PM, Jerry C. Adams <midrange@xxxxxxxx> wrote:

Thanks, I needed that.

Jerry C. Adams
IBM i Programmer/Analyst
Some of the facts are true, some are distorted, and some are untrue. - U.S.
State Department spokesman
--
A&K Wholesale
Murfreesboro, TN
615-867-5070


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of John Jones
Sent: Thursday, April 07, 2011 11:09 AM
To: Midrange Systems Technical Discussion
Subject: Re: Which Tape Drive?

http://en.wikipedia.org/wiki/Linear_Tape-Open
http://en.wikipedia.org/wiki/Digital_Data_Storage

In short: LTO1-5 runs in speeds of 20-140MB/s depending on tape generation.
DDS runs at 0.18-6.9MB/s.

The slowest LTO (original spec) is 3x faster than the fastest DDS.

On Thu, Apr 7, 2011 at 10:19 AM, Jerry C. Adams <midrange@xxxxxxxx> wrote:

"Compatibility" reminds me of a Rita Rudner routine. She was talking
about
LPs to 8-tracks to cassettes. Said she wasn't going to CDs until she got
a
written guarantee that this was the last change. Minutes later she was
talking about street people: "You've seen those people walking down the
street talking to themselves. Those are the ones that bought 8-tracks."

Charles, I think, said something about slower, too. Can you, or anyone,
define slower - relatively speaking: LTO5 to 4mm?

At my previous employer, I used to use lower capacity (and cheaper)
cartridges to do a Save 21. Took 4-6 hours. One day I used the higher
capacity cartridge; it took just over one [1] hour.

Jerry C. Adams
IBM i Programmer/Analyst
Facts are stupid things. - Ronald Reagan
--
A&K Wholesale
Murfreesboro, TN
615-867-5070


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of DrFranken
Sent: Thursday, April 07, 2011 9:55 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: Which Tape Drive?

4mm: Slower, less compatibility with others ( I have *ZERO customers
with 4mm for example)

LTO5: Faster, more compatible.

- Larry

On 4/7/2011 8:54 AM, Jerry C. Adams wrote:
Getting back to our Power 7 proposal, an LTO5 and 4MM have been
proposed
as
alternatives. I see LTO mentioned all of the time in the list, but the
cost
of the 4MM is about $2k less. So what would be the downside/advantage
of
going to the cheaper 4MM?



Jerry C. Adams

IBM i Programmer/Analyst

The streets are safe in Philadelphia, it's only the people who make
them
unsafe. - Frank Rizzo, major of Philadelphia

--

A&K Wholesale

Murfreesboro, TN

615-867-5070



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