Yep... I am working with just such a customer; getting rid of 3590E's (9
drives, 7=SCSI, 2=Fibre) in their 3494 silo, replacing with STK SN6000 (SAN)
virtualizing the PowderHorn silo, 14 drives (9940A's, maybe upgrade to B's,
later). LTO is not the industrial-strength quality of 3590 or 9840/9940,
period... but, even with the best tape technology, you still should consider
copy pools (for offsite and/or protection against media failure during
restore of production data). Also, we are installing Gresham EDT
single-server (to start), in preparation for LAN-free and library sharing
(with a 2nd TSM server).
Absolutely... always mirror (with TSM) your db & log; also, search the
archives for more "best practices" kinds of things like copy pools,
roll-forward mode, striping considerations, etc. To move nodes from
mainframe to Sun, get on 5.1 first; this version has a one-step
export/import feature (rather than the old, two-step process with
server-2-server via virtual volumes)... it's the only way to get your nodes'
data into a TSM server on a dissimilar platform.
This customer does currently about 1 TB per night (of backups), are doing
okay backup window and reclamation-wise, have now embarked on a server
consolidation plan which is adding about 800 to 1,000 NT servers to the TSM
environment. I have been researching (via dsmaccnt.log and summary table)
their data volume, file space occupancy, and retention policies to come up
with a data migration plan. We are keeping the existing AIX box (S80 on SP
switch/complex), so it's a simple matter of (a) put 9940's into production
(using new storage pool), (b) wait for a couple weeks, so normal attrition
will eliminate all but the current client disk occupancy worth of backup
data, then (c) let run storage pool migration (define new pool as the
nextstg of the old stgpool) on one or more weekends (we figured about 10 TB
per every 72-hour period,,, that's with a conservative 5 MB/sec thruput per
3590 drive).
For more complete answers to your laundry list of questions, I suggest you
try using ServerGraph (that's what we're planning to do) -- else, just hack
your way thru the myriad of data to answer the Q's for your environment.
Don France
Technical Architect -- Tivoli Certified Consultant
Tivoli Storage Manager, WinNT/2K, AIX/Unix, OS/390
San Jose, Ca
(408) 257-3037
mailto:don_france AT att DOT net
Professional Association of Contract Employees
(P.A.C.E. -- www.pacepros.com)
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Remco Post
Sent: Wednesday, September 04, 2002 9:13 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Move from 3590 to LTO or 9840/9940
On woensdag, september 4, 2002, at 03:13 , Joni Moyer wrote:
> Hi everyone!
>
> I know that I have asked questions about his before, but I am now
> looking
> for individuals that have done this conversion and what
> experiences/opinions you may have on this topic. I was wondering if
> anyone
> has gone from 3590 Magstar tape cartidges to LTO or 9840B or 9940A? If
> so,
> could you answer the following questions for me so that I can get an
> idea
> of what your environment is like and if it is similar to mine? Thanks
> for
> any input!!!! If you have gone from any tape device to LTO, 9840B or
> 9940A
> please let me know of you experiences also.
>
> We have 2 TSM servers (1 production, 1 test) that we will be moving from
> the mainframe to SUN servers on the SAN. We will be doing 8 LAN-free
> backups. We back up approximately 1 TB per night with backups and
> archives. We also have about 200 clients. We currently have 3590
> Magstars
> and it takes about 1/2 - 1 hour to reclaim a tape that is 40%
> utilized. We
> don't mirror our DB/log volumes. If you have any suggestions on a move
> from the mainframe to a SUN server I would also appreciate this a
> lot!!!!
> Thanks again!
Mirror the db volumes. That is one you'll need to do for sure. In case
you loose a disk, you're screwed, and with the amout of data you're
moving each night, that meast guaranteed loss of data that is
inrecovverable.
We use both 3590E an 9840 on our TSM server, both work great. About
comparable in speed. I think the 9840's compression is just a touch
better that the 3590E's, but not by much.
>
> 1. What are the sizes of the files that you back up? Are they all
> small
> files or do you also have large databases being backed up or archived?
>
> 2. How much data are you backing up per night? And also archiving?
>
> 3. What is you maximum tape mounts per hour? How many tape drives do
> you
> use concurrently?
>
> 4. How long does it take you to reclaim a tape that is about 50% full?
>
> 5. Do you consider your type of media reliable? How many bad tapes
> have
> you had?
>
> 6. How long have you had this type of media working with TSM?
>
> 7. Do you share tape drives? If so, what software do you use?
>
> 8. How many clients do you have?
>
> 9. Do you mirror your recovery log and DB volumes?
>
> 10. How many drives do you have for TSM?
>
> 11. What is your data compression ratio?
>
> 12. Do you have high duty cycles?
>
> 13. Is your TSM server on the mainframe, AIX, SUN, etc.?
>
> 14. Do you have any LAN-free backups on a SAN?
>
> Joni Moyer
> Associate Systems Programmer
> joni.moyer AT highmark DOT com
> (717)975-8338
>
---
Met vriendelijke groeten,
Remco Post
SARA - Stichting Academisch Rekencentrum Amsterdam http://www.sara.nl
High Performance Computing Tel. +31 20 592 8008 Fax. +31 20 668 3167
PGP keys at http://home.sara.nl/~remco/keys.asc
"I really didn't foresee the Internet. But then, neither did the computer
industry. Not that that tells us very much of course - the computer
industry
didn't even foresee that the century was going to end." -- Douglas Adams
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