HP NetServer AA 4000 HP AA HP Netserver 4000 Reference Guide - Page 105

Local Backup, Semi-Local Backup, Network Backup

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Ch 6: Backp and Restore The IOPs will have one NIC each that is not redirected and will be connected to the same switch for the network backups. In this configuration, the backup software backs up the CE and the two IOPs as three individual systems. Configuration Comparisons The following table lists the factors of tradeoff among the three configurations: Local Backup Semi-Local Backup Network Backup Backup Performance Centralization of Backup Installation / Configuration Tape devices Backup software Installation / Configuration Gives best backup performance. No centralization. Requires separate management of multiple tape drives and multiple tape cartridges. If data set backed up is large, this can require significant IT operator time. With four tape drives total, this is the most cumbersome solution. Additional considerations include: more hardware in the rack, more cabling, more power requirements, separate SCSI HBA in the IOP, three backup software licenses needed, and extra software configuration. Four tape devices. Purelocal backup requires duplicate tape drives for both CE and IOPs for HP AA. Pure-local backup requires three complete installation of backup software. One for CE, and one for each IOP. Backup performance is good for the CE, but slow for the IOPs. This may be acceptable since the IOP, in general, has very little storage requirement. IOPs are static in nature and they do not need a freqent backed. Overall, the impact is moderateas a 500MB IOP partiiton takes as little as 20 minutes to backup. No centralization. Requires separate management of multiple tape drives and multiple tape cartridges. If data set backed up is large, this can require significant IT operator time. The easiest of the local backup solutions. Additional configuration is only needed to redirect the tape drives to the CE and to perform a network backup for the IOPs. In semi-local backup configuration, only two tape drives for CEs are required. Install backup software on CE for local backup. Only client-side backup software components are required on each IOPs. Slowest of the backup performance. The dedicated Backup Network becomes a major factor that limits the throughput. One should take into consideration the network bandwidth that is shared among many systems. Network backupd allow a single backup server to backup all the systems from a central data center. This is the optimum for centralization. Network backups requires two additional NICs in each IOP with one additional IP address to configure on each IOP and on the CE. Connect to a private backup LAN for best network backup performance and to reduce load on user network. Use an autochangers for the network backup. Since the changer usually cost more but can be shared to backup other systems on the same network. In network backup configuration, the CE and both IOP are backup clients. Each requires only the client-side backup software components. Network Server Division 6-5

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Ch 6: Backp and Restore
Network Server Division
6-5
The IOPs will have one NIC each that is not redirected and will be
connected to the same switch for the network backups.
In this
configuration, the backup software backs up the CE and the two
IOPs as three individual systems.
Configuration Comparisons
The following table lists the factors of tradeoff among the three
configurations:
Local Backup
Semi-Local Backup
Network Backup
Backup
Performance
Gives best backup
performance.
Backup performance is
good for the CE, but slow
for the IOPs.
This may be
acceptable since the IOP, in
general, has very little
storage requirement. IOPs
are static in nature and they
do not need a freqent
backed. Overall, the impact
is moderateas a 500MB IOP
partiiton takes as little as 20
minutes to backup.
Slowest of the backup
performance.
The
dedicated Backup Network
becomes a major factor
that limits the throughput.
One should take into
consideration the network
bandwidth that is shared
among many systems.
Centralization
of Backup
No centralization. Requires
separate management of
multiple tape drives and
multiple tape cartridges. If
data set backed up is large,
this can require significant
IT operator time.
No centralization. Requires
separate management of
multiple tape drives and
multiple tape cartridges. If
data set backed up is large,
this can require significant
IT operator time.
Network backupd allow a
single backup server to
backup all the systems
from a central data center.
This is the optimum for
centralization.
Installation /
Configuration
With four tape drives total,
this is the most
cumbersome solution.
Additional considerations
include: more hardware in
the rack, more cabling,
more power requirements,
separate SCSI HBA in the
IOP, three backup software
licenses needed, and extra
software configuration.
The easiest of the local
backup solutions.
Additional configuration is
only needed to redirect the
tape drives to the CE and to
perform a network backup
for the IOPs.
Network backups requires
two additional NICs in
each IOP with one
additional IP address to
configure on each IOP and
on the CE. Connect to a
private backup LAN for
best network backup
performance and to reduce
load on user network.
Tape devices
Four tape devices.
Pure-
local backup requires
duplicate tape drives for
both CE and IOPs for HP
AA.
In semi-local backup
configuration, only two tape
drives for CEs are required.
Use an autochangers for
the network backup. Since
the changer usually cost
more but can be shared to
backup other systems on
the same network.
Backup software
Installation /
Configuration
Pure-local backup requires
three complete installation
of backup software. One
for CE, and one for each
IOP.
Install backup software on
CE for local backup.
Only
client-side backup software
components are required on
each IOPs.
In network backup
configuration, the CE and
both IOP are backup
clients. Each requires only
the client-side backup
software components.