The serialization parameter isn't so much for "in use" files as it is for
files that change while they are being backed up. For example, if a file
is open ("in use") by the Windows notepad.exe program, TSM can back it up
regardless of the serialization setting, as long as you don't save the
file while TSM is backing it up. If you actually save the file while TSM
is backing it up, then TSM will detect this, and either retry the backup
or skip the file, depending on the serialization setting.
Always use CAUTION with DYNAMIC or SHRDYNAMIC serialization, since this
means that the backup copy may be inconsistent ("fuzzy"). It is
recommended that DYNAMIC or SHRDYNAMIC serialization be used ONLY for
those files where a restore of a fuzzy copy would be usable. Check with
the vendor of the application that uses the file to see whether a fuzzy
copy would be usable.
A different (but related) subject is "locked" files. A file is considered
to be "locked" when an application opens the file for exclusive use, such
that no other application (including TSM) can open the file. Note that
locked files are NOT equivalent to open files; rather, they are a subset
of open files. Open files can be broken out like this:
Open ("in use")
Shareable (nonexclusive)
Shareable for read
Shareable for write
Shareable for read and write
Non-shareable (exclusive or "locked")
Notepad.exe opens files such that they are shareable, which is why it is
possible for TSM to back up these files.
When this subject comes up, it is usually with regard to how TSM handles
(or, more correctly, can't handle) non-shareable files. In this case,
regardless of the TSM copy serialization setting, TSM can not open these
files, and thus it can not back them up; at least not without the help of
an open file manager, such as St. Bernard Software's "Open File Manager"
product.
Regards,
Andy
Andy Raibeck
IBM Software Group
Tivoli Storage Manager Client Development
Internal Notes e-mail: Andrew Raibeck/Tucson/IBM@IBMUS
Internet e-mail: storman AT us.eyebm DOT com (change eye to i to reply)
The only dumb question is the one that goes unasked.
The command line is your friend.
"Good enough" is the enemy of excellence.
"Talafous, John G." <Talafous AT TIMKEN DOT COM>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
10/11/2002 06:43
Please respond to "ADSM: Dist Stor Manager"
To: ADSM-L AT VM.MARIST DOT EDU
cc:
Subject: Re: Backing Up Open Files
The 'COPY SERIALIZATION' parameter in the 'BACKUP COPY GROUP' of the
'MANAGEMENT CLASS' in the 'POLICY SET' of the DOMAIN specifies what to do
with an 'IN USE' file. Your choices are:
STATIC - Try once and backup only if not in use.
SHRSTATIC - Try as many as CHANGINGRETRIES parameter. Backup if not in
use.
DYNAMIC - Backup the file on the first attempt, in use or not.
SHRDYNAMIC - Try as many as CHANGINRETRIES parameter. Try to backup file
when not in use, but backup anyway on the last attempt.
In this case, you want one of DYNAMIC of SHRDYNAMIC specified in your
policy.
John G. Talafous IS Technical Principal
The Timken Company Global Software Support
P.O. Box 6927 Data Management
1835 Dueber Ave. S.W. Phone: (330)-471-3390
Canton, Ohio USA 44706-0927 Fax : (330)-471-4034
talafous AT timken DOT com http://www.timken.com
-----Original Message-----
From: Vazquez Vegas, Sergio [mailto:svazquez AT ENDESA DOT ES]
Sent: Friday, October 11, 2002 4:30 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Backing Up Open Files
Hi TSM'ers
Does anyone know about any Tivoli Storage Manager module or tool
used for backing up open files?
Best regards, Sergio.
Sergio Vázquez Vegas
svazquez AT endesa DOT es
Tlf: 91.213.46.88
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