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Multiplexing also has some drawbacks:
• Data from multiple clients and/or applications is mixed on the same tape, hence you cannot
accurately identify the data that the tape holds (for example, it would be difficult to say that your
Exchange data is on one tape, or that another tape is the backup of server A).
• Restoring data from a multiplexed tape can be slower because the data blocks of a particular client
or application will not be aligned on the tape. Therefore, the tape drive has to search for the next
block on tape.
When backing up to disk and then copying the data to tape, there is no need to multiplex the data
streams as you are less dependent on a backup window and your backup design should allow fast
access between backup disk and tape.
A common backup method will most likely be tape, at least for servers that have directly attached
tape drives or share drives on a SAN, and incremental backups to disk. This will reduce the need for
multiplexing and also optimize the number of tape drives needed.
Branch office backup consolidation
A major trend is to consolidate backups by bringing the data from remote or branch offices to a
central site. This offers many benefits:
• Increased control of critical data by storing a copy centrally
• Reduced reliance on non-IT personnel in remote sites to perform backup operations
• Cost efficiency, with the recent price drop in high-speed long-distance communication links
• Improved disaster-recovery capabilities
It is still common to perform local backups to direct-attached tape drives on file and print servers in
local offices. With backup consolidation, these backups can be replaced either with replication of
data to a central site for backup, for example, with HP OpenView Storage Mirroring software, or with
local backups to disk followed by a second copy sent to a central site. The latter can be fully
automated by the backup and restore software.
HP Data Protector software supports fully automated backup consolidation using backup to disk. It
works in the following way:
1. In the branch or remote office, backups are performed to a local disk, which can be either internal
or external. Typically, these backups are stored for one to two weeks. As the backup runs locally,
it can be very efficient and quick and reduces the backup window needed.
2. After a completed backup, HP Data Protector software will copy the backup files over the network
to a backup server at the central site. This operation runs in the background and only accesses
backup data, not production data. At the central site, the backup data can be stored longer on
disk, if required to accommodate fast file restoration.
3. The third step is to copy the backups to tape, which is done from the central backup disk.
Typically, the central backup and restore environment is designed to provide high-speed backup to
tape from disk. When backups have expired on disk, data can still be restored from tape directly
to the client over the network.
For disaster recovery, HP Data Protector software includes a feature called Disk Delivery. This restores
all server data to a disk centrally, then sends the disk to the remote office, replaces the faulty system
disk, and reboots from the newly restored drive. Especially useful for remote sites, Disk Delivery can
simplify restoration if the network does not have the necessary bandwidth for a full server restore.
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... Este manual também é adequado para os modelos :
Software - HP Data Protector V6.11 Software (1.11 mb)
Software - HP OpenView Storage Data Protector V5.5 Software (1.11 mb)
Software - HP OpenView Storage Data Protector V6.0 Software (1.11 mb)