RE: ULTRIUM TAPE DRIVE - LTO -- MIDRANGE-L

On the weekend of 10/19 we did our unload/reload on what became a 820-24AA
with 196.7GB at 73% full.  Save ran from 20:50 to 06:33, or 9 hours 43
minutes.  Now, those of you whom have been through this process know there
are a lot of prompts to answer.  Basically we started to restore lic at
09:09.  That, and the disk initialization and some other crud ran until
13:59.  At this time we started the OS restore.  This, and the user
libraries ran until 06:16 when we got a message about partially restored
(some device configurations, etc)  At 10:20 we answered the message (I was
out hunting) and the RSTDLO's and stuff started.  This restore ended at
13:00.
Then, to ensure that we had restored logicals which span libraries we ran
the following:
RSTLIB SAVLIB(*ALLUSR) DEV(TAP03) ENDOPT(*UNLOAD) OPTION(*NEW) MBROPT(*NEW)
ALWOBJDIF(*ALL)
This started at 13:29 and ran until 18:56.

Our downtime instructions was 20 pages and included all pertinent
information from "Backup and Recovery Guide".  And included cum's and
various group PTF's.  Times, and other notes, were written in the margins
as we went along.

And this 196.7 at 73% full fit on ONE 3581 tape versus the five 3570 tapes
it used to take.

Rob Berendt

==================
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
Benjamin Franklin



                    "Bruce Collins"
                    <bacollins@twitchel       To:     <midrange-l@midrange.com>
                    lcorp.com>                cc:
                    Sent by:                  Fax to:
                    midrange-l-admin@mi       Subject:     RE: ULTRIUM TAPE 
DRIVE - LTO
                    drange.com


                    11/08/2001 01:31 PM
                    Please respond to
                    midrange-l






I had heard that it was very fast on saves but you took a beating on
restores. Has anyone else have any history on this drive doing a
restore.

Bruce

-----Original Message-----
From: Gwecnal@aol.com [mailto:Gwecnal@aol.com]
Sent: Thursday, November 08, 2001 12:13 PM
To: midrange-l@midrange.com
Subject: Re: ULTRIUM TAPE DRIVE - LTO


In a message dated 11/8/2001 5:58:59 AM Pacific Standard Time, "Bruce
Collins"
<bacollins@twitchel writes:

>  We are buying a 820 DDS and they have on the config for a tape drive
the
>  following: 3580-H11        ULTRIUM TAPE DRIVE - LTO
>  Has anyone heard any issues with this device.

Our new 820 came with one.  Our old system had two 3490's that held
six tapes each.  Our backups took 3.5 hours and we were running out of
room.
Now the backup takes 55 minutes and we could back up every day for a
week
on one tape!

The downside - restores are SLOW!!!!  So slow, I thought we must be
doing
something wrong.  How slow?  About an hour to restore a file located
toward
the end of the backup with *search.  About 45 minutes if you specify the
sequence number, but the only way to know that is to do a dsptap - and
that takes 20-25 minutes.
In fact, restoring all user libraries does not take much longer than
restoring
just one file (if the file is near the end of the backup).
Great for backup - but do not put a lot of data on the tape and use it
for
a lot of interactive restores.
Funny thing - the network guys were so impressed that they bought the
pc version (same thing but uses 'low voltage scsi?') and thier backup
AND restore times are blazing quick.  Go figure.

HTH, Lance
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