STORE and TurboSTORE/iX Products Manual (B5151-90003)

120 Chapter7
TurboSTORE/iX 7x24 True-Online Backup
Using TurboSTORE/iX 7x24 True-Online Backup
Using TurboSTORE/iX 7x24 True-Online Backup
When using TurboSTORE/iX 7x24 True-Online Backup, you can perform file, application,
and system backups without closing files or disrupting users. Some guidelines for
performing these backups are discussed below.
TurboSTORE 7x24 True-Online Backup can perform two types of online backups:
• The first type is referred to as an online backup , which requires that all files being
stored be closed for write access when the backup first starts. This is the type of online
backup formally available with the TurboSTORE/iX II with Online Backup product.
The online backup refers to a backup created with only the ONLINE option of
TurboSTORE/iX 7x24 True-Online Backup.
• The second type is referred to as a 7x24 true-online
backup
, which lets you backup applications without requiring any files to be closed for
write access at any time during the backup.
The 7x24 true-online backup refers to a backup created with the ONLINE=START or the
ONLINE=END option of TurboSTORE/iX 7x24 True-Online Backup.
The Sync Point
When performing a backup, you want to know at what point in time the backup occurred.
This is helpful when performing a recovery so you know that all files were restored to a
state at the same time. This is the point called the
sync point , where all files are
synchronized. It can occur at different times, depending on the type of backup performed.
You can schedule when the sync point occurs (either at the start or the end) by scheduling
when the backup job is launched. Be aware, however, that a certain set up time is required
for TurboSTORE to create the list of files to be stored. Depending on the number of files
being stored, the sync point may happen soon after the backup is launched, or may occur
5-15 minutes later. To better control when the sync point occurs, a fixed time can be
specified on the STORE command line. See "Creating a 7x24 True-Online Backup
(ONLINE)" later in this chapter for more details.
The NOTIFY option can also be used to launch a job stream once the sync point has
occurred. See Chapter 6, "Notification of File Availability (NOTIFY)".
WARNING All 7x24 true-online backups created with the sync point at the
beginning can be restored on any MPE/iX system. However, backups
created with the sync point at the end can only be restored or
verified on MPE/iX Release 5.5 or later. If you know at the time you
perform the backup that a tape must be restored onto an earlier
release, create the tape with the sync point at the beginning.