ACRONIS Backup & Recovery 10 Advanced Server User's Guide download pdf (Page 154)

 compression level provides CL average reduction coefficient

 selected tape rotation scheme is Custom with the following settings:

 full backup - every 10 days

 differential backup - every 2 days

 incremental backup - every 1 day, every 6 hours

 retention rules: delete backups older than 5 days

 tape options are the following:

 the Use a separate tape set option is selected

 the Always use a free tape: For each full backup option is selected

 the Always use a free tape: For each incremental backup option is cleared

 the Always use a free tape: For each differential backup option is cleared

 tape size is T_GB.

The case defines the line of backups that consists of two sections. The figure below shows the

sections at the moment before the first backup will be deleted. In the figure the full, differential and

incremental backups are designated as orange, blue and green rectangles respectively.

At the moment some backups are deleted by the Cleanup task. Deletion of the outdated backups

painted in dark colors is postponed, as these backups are basic for the actual backups.

As an exact correlation between the tape size and backup's size is unknown, it is impossible to

determine number of the tapes that will be free after the deletion. So the calculation ignores this

probability.

Tape set 01 should contain (round up (( F_GB + 4*D_GB + 5*7*I_GB) * CL / T_GB)) tapes to store the

backups. Tape set 02 needs (round up (( F_GB + 1*D_GB + 7*I_GB) * CL / T_GB)) tapes. The sum of

the calculated values gives the total number of tapes required for the case.

What if

 What if I have to move tapes with backups from one tape library to another?

1. If both tape libraries are attached to the same machine with Acronis Backup & Recovery 10

Storage Node installed (i.e. the libraries are managed by the same storage node), the storage

node database has all the required information about the content of the moved tapes. So all

you need to do is to perform the inventory (p. 138) procedure for the managed vault on the

library where the tapes were placed to.

2. If you move tapes to a tape library managed by another storage node, you should rescan (p.

139) each relocated tape to provide the storage node with information about backups

contained on the tape.

 What if I need to use a tape from the tape library in the local tape device and vice versa?

Acronis agents create backups on tapes in a format that differs from the format used by the

storage node. It is the reason why it is impossible to interchange tapes between tape devices

attached to a storage node and attached to a managed machine: a tape written by a storage

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 380 381

No comments

ACRONIS Backup & Recovery 10 Advanced Server User's Guide Page 154