It's also worth pointing out that ADSM/Tivoli Storage Manager makes a
distinction between "backup" and "archive" that often does not apply to
other data protection practices.
Backups are intended to let you restore the state of the machine at
some relatively recent time. They are intended to protect against
inadvertent data loss, whether due to "ohno" moments, hardware failure,
or Hurricane Flood, er, Floyd.
Archives are intended to preserve a snapshot of particular files at
a particular time, and to retain those files for a specified period.
They are intended to save data for legal, accounting, or other business
reasons.
When you go to define the requirements, it helps to talk about these
distinctions.
Rich
At 09:22 AM 10/6/99 -0600, Kelly J. Lipp wrote:
>What are you really trying to do? Sounds like you're trying to make ADSM
>work like other products. This is usually not a good idea. Back up and
>decide what your overall restoration objectives are, not in terms of weekly
>fulls and daily incrementals, but in business terms. For instance, perhaps
>you have the requirement to be able to restore files up to thirty days old.
>In that case, define a backup copy group with verexists, verdeleted, retain
>extra and retain only all set to 30 (optionally, verexists and verdeleted
>can be set to 9999).
>
>The notion of keeping an incremental backup for some period of time and a
>full for some other does not exist within ADSM/Tivole Storage Manager. Your
>analysis of management classes is correct and points out the flaw in that
>approach.
>
>Kelly J. Lipp
>Storage Solutions Specialists, Inc.
>PO Box 51313
>Colorado Springs CO 80949
>719-531-5926
>www.storsol.com
>lipp AT storsol DOT com
>
>-----Original Message-----
>From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
>Masa, Ralf
>Sent: Wednesday, October 06, 1999 6:52 AM
>To: ADSM-L AT VM.MARIST DOT EDU
>Subject: incr backups with varying mgm
>
>
>Is it efficient to do incremental backups on one filesystem with different
>management classes?
>
>Example:
>Monday - Friday: mgmtclass day (versioning: nolimit, retain: 7 days)
>Saturday: mgmtclass week (versioning: nolimit, retain: 30 days)
>
>Although file are bound to mgmclass week when stored on saturday, they are
>rebound to mgmclass day on monday. So they will expire after one week
>instead of beeing held for 30 days.
>
>Does it mean that we have to do do an archive on saturday ?
>
>TIA, R. Masa
>
>
Richard C. Dempsey email: dempsey AT kodak DOT com
Public Online Services pager: 716-975-3539
11th Floor, Bldg 83, RL phone: 716-477-3457
Eastman Kodak Company fax: 716-722-3885
Rochester, NY 14650-2203
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