-Krishna-
All of your questions can be answered at the following site, which contains
All of your questions can be answered at the following site, which contains
all of the documentation for TSM! But, here is an attempt to answer the
majority of your questions.
http://www.tivoli.com/support/storage_mgr/pubs/admanual.htm
How are NFS mount points backed up with ADSM?
A. When TSM connects a backup-archive client to an NFS file system, you can
use either a hard mount or a soft mount. TSM uses the nfstimeout option
setting to determine how long to wait for an NFS system call to respond
before timing out, this applies to hard and soft mounts. The default is 10
seconds.
You should be aware of the consequences of hard and soft mounts if the mount
becomes stale (for example, if the server for the file system is not
available).
Hard mount
-- If the NFS file system is hard mounted, the NFS daemons will try
repeatedly to contact the server. The NFS daemon retries will not time out,
repeatedly to contact the server. The NFS daemon retries will not time out,
will affect system performance, and you cannot interrupt them, but control
will return to TSM when the nfstimeout value is reached.
Soft mount
-- If the NFS file system is soft mounted, NFS will try repeatedly to
contact the server until either:
contact the server until either:
A connection is established
The NFS retry threshold is met
The nfstimeout value is reached
When one of these events occurs, control returns to the calling program.
How many client backups can run concurrently ?
A. You are limited by the number of tape drives, the size of your disk
storage pools, network infrastructure, etc...
Can ADSM back up open files ?
A. Yes, but it might result in a fuzzy copy which does not accurately
reflect the correct data that was backed up. TSM looks for files that have
changed between the start and the completion of the file's backup. Some
files on your system may be in use, or open, when you try to back them up.
Because an open file may change, a backup action might not reflect the
correct contents of the file at a given time.
Does ADSM support data compression ? If so, What is
the compression ratio ?
A. Yes, but is not recommended! Tape drive compression would give you a
better result depending on the type of drives that you have. The compression
ratio is dependant on the type of tape drives that you have, i.e 3590 gives
3:1 compression ratio.
Can more than one tape be written to at the same time
? ie. Can full dumps and
incremental be writing to two different tapes on
different drive, simultaneously ?
A. Yes
How are SYMBOLIC LINKs handled ?
A. TSM handles symbolic links differently than it does regular files and
directories. In some operations, such as a backup, only the path information
that the symbolic link contains is backed up. In other operations, such as
archive, the file to which the symbolic link points is archived, but under
the name of the symbolic link. For more information on how symbolic links
are handled during an archive operation, see Archsymlinkasfile
http://www.tivoli.com/support/storage_mgr/pubs/v4pubs/v1_html/aix/unixc/ans5
tfrm.htm !
The remainder of your answers will be in the documentation from the above
link!
Thanks,
Demetrius Malbrough
TSM Consultant
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