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Conference decwet::networker

Title:	NetWorker
Notice:	kits - 12-14, problem reporting - 41.*, basics 1-100
Moderator:	DECWET::RANDALL.com::lenox

Created:	Thu Oct 10 1996
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	750
Total number of notes:	3361

622.0. "Many sessions for the same client?" by VAXRIO::ALCIDES (Alcides Rocha DC - Brazil) Thu Apr 24 1997 08:00

    The Networker SPD says that 32 concurrent backup/recover sessions are
    supported. It also says that 16 backup devices are supported
    simultaneously.
    
    My question is:
    
    If Networker is running on a system with multiple backup devices and
    there is a client with lots of data to be copied, is it possible to
    start multiple sessions with the same client and use many backup
    devices in parallel to backup data of this client?
    
    It's not clear for me in the SPD if multiple sessions can be started
    for a single client or if only one session can be started for each
    client.
    
    I need this information to propose a solution for a customer.
    
    
    Alcides

T.R	Title	User	Personal Name	Date	Lines
622.1		DECWET::CARRUTHERS	Life gets easier when you realize you can't have everything.	`Thu Apr 24 1997 10:19`	4
	Your question has many layers of complexity to it and I'm afraid a simple yes or no answer will mislead you. How much experience with NetWorker do you have?
622.2	Not much experience ...	VAXRIO::ALCIDES	Alcides Rocha DC - Brazil	`Fri Apr 25 1997 06:25`	22
	I don't have much experience with Networker. We have it installed in some customer sites, mainly for backup of PCs and UNIX workstations. There is a customer who intends to have a backup server in the network for multiplatform systems. One of these systems is a big Digital UNIX server with 350 Gbytes of storage. The system has several databases that need to be copied to tapes frequently. The idea is to backup those databases in parallel. The backup server would start multiple sessions to the Digital UNIX client, and make the backup of the databases using DLT tapes in parallel. Because of my lack of experience with Networker, I don't know if this configuration is acceptable for the purpose intended. Maybe for this big server they'll have to install a dedicated tape library in a local SCSI bus. I'll appreciate any idea. Thanks
622.3		DECWET::RWALKER	Roger Walker - Media Changers	`Fri Apr 25 1997 09:06`	8
	Yes, NetWorker allows multiple sessions from each client. This is limited depending on the version but it is at least four per client. For UNIX each session must be from a different disk. This only applies to saves started as a group such as from the automatic schedule. If you start the saves on the client via cron I don't think that there is any hard limit, just what is reasonable with system and network load.
622.4	Thanks ...	VAXRIO::ALCIDES	Alcides Rocha DC - Brazil	`Fri Apr 25 1997 11:08`	5
	Thanks, Roger. That's the answer I was looking for. If I use multiple TZ89s, maybe I'll have a bottleneck in the network card. I'll have to check the configuration in detail.