3 versions for incremental backup would, if you have 3.7TB of data, become 3 times the amount in the library(11.1TB).
4 versions of archieved information would become 4 times the amount of archived information(14.8TB if you archive all data).
- You don't have to transport either full, nor Legato/Veritas incrementals(which means full+incr+incr+incr+incr+incr and then start over with full).
- Reclamation. With this much information stored on tape, reclamation is necessary to keep the library from eating tapes.
I would also recommend you to use a tape technique which stores a lot of information on each tape, such as LTO which stores 100GB uncompressed, and 200GB compressed.
Using large tapes would get us to the next feature, which is copypools. Loosing one 200GB tape means loosing a lot of information. Therefore, using copypools as media protection is a good idea. On the other hand, using copypools means using twice the amount of tapes, as you have one copy of each tape that holds information.
A IBM 3584 library holds 144 tapes as default, which means 28.8TB compressed, and can, with a small investment, hold 288 tapes, or 56.6TB compressed.
If you would like to expand the library further, just add another frame to the library. Each frame can hold about 440 tapes, which means 80TB compressed. You can have up to five additional frames.
The point is to not have to remove tapes from the library, as this is a manual intervention, and opens up for human errors. You could make it with a smaller library, but that would mean removing, and inserting, tapes into the library.
-----------------------------------
Daniel Sparrman
Exist i Stockholm AB
Bergkällavägen 31D
192 79 SOLLENTUNA
Växel: 08 - 754 98 00
Mobil: 070 - 399 27 51
-----"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote: -----
To: ADSM-L AT VM.MARIST DOT EDU
From: Zosimo Noriega <znoriega AT ADNOC DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
Date: 03/12/2002 05:22AM
Subject: Re: Tape Library Capacity Requirement.
hi daniel,
currently we're using ADSM 3.1 and IBM 3494 TL, we're planning to upgrade or
change the backup & tape library solution, so, we're still evaluating the
solution. we selected 3 backup solutions from the list (TSM, LEGATO,
VERITAS)with there own proposed tape library. Since, we have that disk
spaces available (3.7TB) with 80% utilised, we want to calculate the
required TL capacity. If we selected TSM what is the required capacity for
TL if we implemented 4 versions of archive & 3 versions of incremental
backups.
reagrds,
-----Original Message-----
From: Daniel Sparrman [mailto:daniel.sparrman AT EXIST DOT SE]
Sent: Monday, March 11, 2002 5:55 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Tape Library Capacity Requirement.
Hi
It sounds like you're going to use a "full backup" software such as Legato.
However, I will do my estimates based on TSM, which uses incremental
backups, and version management to be able to do point-in-time restores of
files(older version of a file than the latest) and applications.
I'd probably propose a IBM 3584 Anaconda with at least 3 drives, preferable
fibre attached.
I guess that you are going to use TSM with this library. Therefore, you
will probably not use full backups, but incremental. And, on fileservers, I
recommend using more than 3 versions(which is standard within TSM). This
will grow your total storage by the number of versions you want to use.
It' very hard to calculate total storage requirements, when you don't tell
us what kind of data that is going to be kept in the library(SQL databases,
fileservers and so on).
However, you can count with about 10% change every night on a fileserver,
and, if not to large, use full backups of databases.
I'd say you'll be storing about 10TB total, and preferable, have media
protection using copypools, which means another 10TB.
Best Regards
Daniel Sparrman
-----------------------------------
Daniel Sparrman
Exist i Stockholm AB
Bergkällavägen 31D
192 79 SOLLENTUNA
Växel: 08 - 754 98 00
Mobil: 070 - 399 27 51
Zosimo Noriega
<
[email protected] To:
ADSM-L AT VM.MARIST DOT EDU
OM> cc:
Sent by: "ADSM: Subject: Tape Library
Capacity Requirement.
Dist Stor
Manager"
<
[email protected] .EDU>
2002-03-11 10:52
Please respond to
"ADSM: Dist Stor
Manager"
Please help me to calculate the require capacity of the tape library. I
have 3.7 TB of data and 4 versions of Archive (with 30 days retention
period) and 1 version of backup (full backup) will be implemented.
How can i calculate the required capacity?
Thanks for your help in advance.
Zosi Noriega
ADNOC-UAE.
