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Anleitung Zusammenfassung
Overview of Instant DR
Instant DR enables you to create and maintain identical copies of backup data on VTS disk storage at
one or more locations. Virtual tapes are transmitted from one vault to another. The Instant DR jobs
indicate the pools or virtual tapes to be transmitted. When a job is initiated, a copy of the virtual
tape is transmitted over the network link. Be aware that the virtual tapes duplicated on a remote
vault consume additional disk space, which is the same amount as the original virtual tape.
VTS servers cannot “see” each others’ pools and virtual tapes until the Instant DR jobs run. The pools
and virtual tapes in the primary operation page look identical if all virtual tapes are copied. If
selected virtual tapes are copied using the Instant DR job, the virtual tape and pool lists are
different. Automatic Event Management Service (EMS) mounting chooses from pools as it would in
day-to-day operations because the virtual tapes will be created in the new vault.
Note An Instant DR job will fail if the virtual tape already exists in another pool on the target.
Virtual tape names must be unique across all vaults and pools.
If an encrypted virtual tape is stored on an Instant DR server and the Instant DR server attempts to
perform an operation on the tape, Data Encryption must be enabled and the key server that was used
to encrypt the tape must be configured on the Instant DR server. If not, the tape operation will fail
and an error message is displayed on the Instant DR server indicating that the operation failed. Refer
to the Virtual TapeServer Configuration Guide for information about Data Encryption and an
explanation of the possible failures.
In general, Instant DR should be used if files do not change much from day to day. Data is transmitted
in batches, one or more times per day, and only data differences are sent. Bandwidth is consumed
when the data transmission is scheduled according to policy, usually during off-peak hours. Instant DR
is supported across multiple sites, from one to many servers based on the configuration.
Instant DR performs well in environments where the backup data does not significantly change on a
daily basis. Synchronizing transaction files, which can change constantly, is not necessary a good use
of Instant DR. Poor performance may result when synchronizing transaction files because the process
by which Instant DR computes file differences can take longer than copying an entire file. You may
also rely on AutoCopy for synchronizing data. See "Overview of AutoCopy" below to determine if
AutoCopy is a better solution for your needs.
If Instant DR is licensed, you must enable licensing by entering the license key as described in the
Virtual TapeServer Configuration Guide. Then, you can create new Instant DR backup schemes as well
as launch and monitor the remote synchronization processes. You can also automate Instant DR
backups using the VTSPolicy command, if EMS communication is configured (refer to the EMS chapter
of the Configuration Guide). This chapter describes how to perform these tasks.
Overview of AutoCopy
AutoCopy enables you to copy a virtual tape from one VTS server to another when the virtual tape is
mounted, modified, and dismounted by the host server. Configure AutoCopy to set the following:
l
The pools to be monitored for mount and dismount activity on the VTS system
l
The VTS system that will be the recipient of copies of modified virtual tapes
l
The pool name on the target and recipient VTS system
26 | Virtual TapeServer Supplemental Installation Guide
...Dieses Handbuch ist für folgende Modelle:
PC Desktops - HP Integrity NonStop J-Series (6.85 mb)
PC Desktops - HP NonStop G-Series (6.85 mb)
PC Desktops - HP NonStop L-Series (6.85 mb)