The NetBackup Sys Admin Guide describes the NetBackup Global Attribute
"Maximum jobs per client". A snip from the pdf is at the bottom here. In a
nutshell, you need to be aware network bandwidth and client disk access
bottlenecks. If you have an array of you client and have multiple backup
classes running then you may have i/o contention.
Good luck,
Doug Braden
VERITAS Impact Team
Maximum jobs per client
Specifies the maximum number of backup and archive jobs that NetBackup
clients can perform concurrently. The default is 1.
NetBackup can process concurrent backup jobs from different classes on the
same client only if:
There is more than one storage unit available.
or
One of the available storage units can perform more than one backup at a
time.
You can specify any number of concurrent jobs within the following
constraints (the default is 1):
Number of storage devices.
NetBackup can perform concurrent backups to separate storage units or to
drives
within a storage unit. For example, a single Media Manager storage unit
supports as
many concurrent backups as it has drives. A disk storage unit is a directory
on disk so
the maximum number of jobs depends on system capabilities.
u Server and client speed.
Too many concurrent backups on an individual client interfere with the
performance
of the client. The actual number that you can use depends on the hardware,
operating
system, and applications that are running.
Because Maximum jobs per client applies to all clients in all classes, set
it to
accommodate the client that can handle the lowest number of concurrent jobs.
Network loading.
The available bandwidth of the network affects how many backups can occur
concurrently. For example, two Exabyte 8500, 8-mm tape drives can create up
to a
900-Kilobyte-per-second network load. Depending on other factors, this can
be too
much for a single Ethernet. If you encounter loading problems, consider
backing up
over multiple networks or using compression.
A special case exists when backing up a client that is on the same machine
as the
server. Here, network loading is not a factor because you do not use the
network.
Client and server loading, however, is still a factor.
-----Original Message-----
From: Dennis Dwyer [mailto:dfdwyer AT tecoenergy DOT com]
Sent: Tuesday, January 02, 2001 11:16 AM
To: veritas-bu AT mailman.eng.auburn DOT edu; dsixbury AT saint-lukes DOT org
Subject: Re: [Veritas-bu] Multiple backups from same client
OK ... I was only partially correct. It appears that only a NetWare client
or Macintosh client can support one backup/restore process at a time. I see
no references to UNIX or NT. Hopefully someone else can provide insight to
UNIX and NT clients.
Regards,
Dennis
Dennis F. Dwyer
Enterprise Storage Manager
Tampa Electric Company
(813) 225-5181 - Voice
(813) 275-3599 - FAX
Visit our corporate website at www.tecoenergy.com
>>> "Sixbury, Dan" <dsixbury AT saint-lukes DOT org> 01/02/01 11:26AM >>>
Has anyone run into problems with running multiple backups from the same
client at the same time. One of our clients has four classes and the
backups sometimes overlap. From what I have read, it shouldn't cause
problems, but wanted to know if anyone out there has run into problems with
this.
Thanks,
Dan
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
|
