Hi Hans,
File permissions are part of the file, on the filesystem, they are stored
inside the file. When backed up, the whole file is backed up, which
includes the permissions. The permissions are not stored in the server
database. That's why the entire file is backed up. It would be different
if file permissions were stored outside the file, then Spectrum Protect
could backup just the permissions.
Also, the permissions are needed for the restore. So if an admin does a
mistake while updating the permissions, they can restore the previous
version with the previous permission. If the permissions were updated on
the file without backing it up, it would be impossible to restore the
previous permissions.
It would also be near impossible to update permissions on existing backups.
Tapes are sequential, so it's impossible to do an update to the file on an
existing tape. The same applies for file pools. Furthermore, the server
doesn't know what the data is, it's unaware of permissions, it's just
storing bytes for the client.
-
Thanks,
Marc...
________________________________________________________
Marc Lanteigne
Accelerated Value Specialist for Spectrum Protect
416.478.0233 | marclanteigne AT ca.ibm DOT com
Office Hours: Monday to Friday, 7:00 to 16:00 Eastern
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-----Original Message-----
From: Hans Christian Riksheim [mailto:bullhcr AT GMAIL DOT COM]
Sent: Wednesday, November 22, 2017 8:48 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Backup of file attributes Windows
When our customers changes permissions on their file servers there is total
chaos with new full backup of everything and no practical method to get rid
of the extra backup data. I think our customers should be able to do this
without paying twice as much for their backups.
>From what I have heard TSM couldn't just update these files because there
is too much overhead keeping this information in the database. However in
the meantime TSM has gone from the proprietary database in v5 to a full DB2
which should handle this well.
It would be nice if IBM took a look at this problem and came up with a
solution. Don't know if other TSM admins think this is an issue though.
Hans Chr. Riksheim
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