The licensing for Gresham is pretty good. I don't have the details but IIRC
it's per Silo used. We've been using it for about 5 years and it works
great. We interface with Library Station on Z/OS wihout a hitch. As for
Library sharing, it does all the work. No need to go through TSM for that,
just configure the drives to ELM and away you go. For that though you have
to use TSM's device driver because library sharing is not supported with the
GenericTape device class, which is what you use with Gresham' AdvanTAPE
driver. The same goes for LanLess backups. Be sure not to use quickloop on a
brocade switch to connect your drives because you will get alot of IO
errors. I have to TSM servers on the same AIX box and they use the same
drives. This setup has been running for over a year with TSM 4.1.3. I use
the same drives on my test box.
When we started we would define the volumes directly in TSM because ELM had
problems managing scratch Tapes. When I converted to TSM' device driver, I
also deleted all my 'empty' tapes in TSM. Haven't had a problem with
overwritten tapes since. Gresham supplies a script to mark used tapes as
non-scratch which I run a few times a day jsut to be sure. It's also easier
this way because you don't have to define volumes for each storage pool.
Guillaume Gilbert
CGI Canada
----- Original Message -----
From: "Joni Moyer" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, July 25, 2002 7:22 AM
Subject: Re: Rif. : LTO Tape OR 9840
Our problem is that with our 9310 silo, if we go the IBM way we will have
to purchase a third party software, Gresham, that will manage the library.
>From what I understand this is not a cheap solution because we have to pay
for each license we have out there which is approximately 250. What is
your environment? Do you have any problems/concerns with either one?
Thanks!
Joni Moyer
Associate Systems Programmer
[EMAIL PROTECTED]
(717)975-8338
Guillaume Gilbert
<guillaume.gilbert@DESJA To:
[EMAIL PROTECTED]
RDINS.COM> cc:
Sent by: "ADSM: Dist Subject: Rif. : LTO
Tape OR 9840
Stor Manager"
<[EMAIL PROTECTED]>
07/24/2002 04:38 PM
Please respond to "ADSM:
Dist Stor Manager"
Hi Joni
I personnaly prefer 9840's but the bean counters love the LTO because the
drives are very much lower cost and the cost per GB is lower. The 9840 is
probably the best
drive/tape on the market today. The native thruput of 9840b's is 20 mb/sec
while the LTO is 16 mb/sec. The start/stop on the 9840 is considerably
faster than the LTO.
Reclaiming a 40 - 50 % full LTO took me 4 to 5 hours (client compressed
data) and I can move data a full 9840 (client compressed data) in less than
30 minutes. I reclaim
my 9840 at 40% and do about 20 to 30 tapes a day easy. Is your STK silo a
9310 or a 5500? Or is it one of the smaller ones like a L180 or L700? With
the big silos the
mount time is not much of an issue. The seek time will be faster with the
9840.
As for tape life, I've been working with 9840s for a little over a year
without any tape failure.
I look at it this way : if I lose a 9840, I loose a max of 20 GB of data.
With an LTO, I loose 5 times that.
Guillaume Gilbert
CGI Canada
Joni Moyer <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 2002-07-24 15:17:32
Veuillez ripondre ` "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
Envoyi par : "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
Pour : [EMAIL PROTECTED]
cc :
Objet : LTO Tape OR 9840
Hello everyone!
The environment here is going to be changing soon... We will be moving off
of the mainframe and onto an AIX server that will be on our SAN. We will
have 1 STK silo for the tapes for 2 TSM servers. Right now we are
considering IBM's LTO or STK's 9840. I was just wondering if anyone out
there has had experience with either one and if so, what are the pro's and
con's of them? Has anyone that has worked with LTO know how long it takes
to recover a bad tape? Considering that they are 100GB tapes, it was
assumed that it would take 5 times as long as it does to recover a Magstar
3590(20 GB). And also, do the tapes get damaged easily or is that all a
matter of handling them to take them offsite to vaults? Thank you!!!!
Joni Moyer
Associate Systems Programmer
[EMAIL PROTECTED]
(717)975-8338
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