-How does an "online" image backup work exactly in regards to open files? According to the docs, "Corruption of the backup may occur if applications write to the volume while the backup is in progress. In this case, run fsck after a restore." So say this occurs.. What do you end up with backed up in the case of that file that was written during the backup? The before version or the after version? Or some hybrid fuzzy file after the restore? I don't entirely see what good running fsck is going to be on a file that the bytes changed in the middle of backing it up. Isn't the image just backing up at the bit level and doesn't really pay attention to open files or changing bytes? I guess I'd just like to hear more info on how an "online" image backup would work.
-under "offline and online image backup" it also says "For linux86 only: TSM performs an online image backup of file systems residing on a logical volume created by the linux logical volume manager during which the volume is available to other system applications". Can I infer that if I am just using reiserfs that I cannot then do an online image backup - only an offline via the device itself? -I find it interesting that you can do an incremental image backup and not entirely sure how that works either. Isn't an image backup just backing up the filesystem bit by bit? How does it know which bits changed or which files? If I read this correctly, it only works with lvm's. It says "Two types of backup only apply to logical volumes: mode=selective (the default) and mode=incremental.". So in the case of linux, if you're using reiserfs I'm guessing you can't do an incremental image backup. You'd have to use ext3 or something similar. Gerald Wichmann Senior Systems Development Engineer Zantaz, Inc. 925.598.3099 (w) This e-mail has been captured and archived by the ZANTAZ Digital Safe(tm) service. For more information, visit us at www.zantaz.com. IMPORTANT: This electronic mail message is intended only for the use of the individual or entity to which it is addressed and may contain information that is privileged, confidential or exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone or directly reply to the original message(s) sent. Thank you.
