if i am doing a backup of 150GB of data from a single client running windows
2000 server on raid 5 connected to a 3 drives tape library , how should i
stream the backup?
----- Original Message -----
From: "Steve Dvorak" <sdvorak AT veritas DOT com>
To: "'Sen'" <discussion.groups AT gmx DOT net>; "Christopher Baughman"
<baughmac AT overture DOT com>
Cc: "netbackup-l" <netbackup-l AT yahoogroups DOT com>; "nbu-lserv"
<nbu-lserv AT dsihost-srv01 DOT com>; <veritas-bu AT mailman.eng.auburn DOT edu>
Sent: Saturday, April 19, 2003 12:39 AM
Subject: RE: [BackupScripts-L] restoration time
> Keep in mind the reason for multiplexing is to get enough data to the tape
> drive to keep it streaming at maximum speed (average 25GB/hr for DLT
8000).
> This means that if you have fast network pipes, and decent servers, you
> should be able to achieve that thruput using 2-3 streams. In other words,
6
> is overkill. You need to strike a balance. Here are some documents that
> should help you.
>
> NetBackup for Windows performance tuning:
> http://seer.support.veritas.com/docs/248373.htm
>
> NetBackup for Unix performance tuning:
> http://seer.support.veritas.com/docs/240733.htm
>
>
> Steve Dvorak
>
> Are you ready for VERITAS NetBackup? Test you knowledge on our NetBackup
> Self-Assessments:
> http://www.veritas.com/education/quicktips/Assessment.jhtml
>
>
> -----Original Message-----
> From: Sen [mailto:discussion.groups AT gmx DOT net]
> Sent: Friday, April 18, 2003 8:22 AM
> To: Steve Dvorak; Christopher Baughman
> Cc: netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [BackupScripts-L] restoration time
>
>
> multiplexing (MPX) is set to 6 during backup to reduce the backup time. i
am
> backing up about 100GB of data files. Is there any other option to speed
up
> the restoration time other than reducing the MPX no. ??
>
>
> ----- Original Message -----
> From: "Steve Dvorak" <sdvorak AT veritas DOT com>
> To: "'Sen'" <discussion.groups AT gmx DOT net>; "Christopher Baughman"
> <baughmac AT overture DOT com>
> Cc: "netbackup-l" <netbackup-l AT yahoogroups DOT com>; "nbu-lserv"
> <nbu-lserv AT dsihost-srv01 DOT com>; <veritas-bu AT mailman.eng.auburn DOT
> edu>
> Sent: Friday, April 18, 2003 10:02 PM
> Subject: RE: [BackupScripts-L] restoration time
>
>
> > Are you using multiplexing (MPX)? If so what value is it set to?
> > Multiplexing allows you to have multiple clients backup to a single
> > tape device, thus driving the device at close to rated speeds, but it
> > is interleaving data on the tape. I.e. if you have MPX set to 10, 10
> > clients would deliver data to the device and essentially Client1 would
> > have a
> piece
> > of data every 10 "blocks". Therefore when doing a restore it would
> > have
> to
> > read Client1 data, skip 9 "blocks", read more Client1 data, skip 9
> "blocks",
> > and so forth. This *could* be the reason, if you are using a high MPX
> > number - recommendation for DLT 8000 drives is 2 to 3 MPX. Other
> > factors that affect restore time are, how quickly the client can
> write
> > data to disk, speed of the network pipe, or even some erroneous bug
> > somewhere. In general you should be able to restore 12-18GB per hour.
> > Steve
> >
> >
> > -----Original Message-----
> > From: Sen [mailto:discussion.groups AT gmx DOT net]
> > Sent: Thursday, April 17, 2003 7:03 PM
> > To: Christopher Baughman
> > Cc: netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: Re: [BackupScripts-L] restoration time
> >
> >
> > i am using a DLT 40/80, it took me 5+hrs to restore only 3.3GB
> > of data!
> > any idea?
> >
> >
> > ----- Original Message -----
> > From: "Christopher Baughman" <baughmac AT Overture DOT com>
> > To: "Sen" <discussion.groups AT gmx DOT net>
> > Sent: Friday, April 18, 2003 12:08 AM
> > Subject: RE: [BackupScripts-L] restoration time
> >
> >
> > It shouldn't take too long, but that can best be answered based almost
> > entirely on your configuration. A good starting place, though, is to
> > take how long it takes to back up that data, and multiply that by 1.5,
> > or even double it. That is a very loose way to look at it that gives
> > a fairly
> close
> > time range. It is rare that I get a restore time that equals the
> > backup time.
> >
> > -----Original Message-----
> > From: Sen [mailto:discussion.groups AT gmx DOT net]
> > Sent: Thursday, April 17, 2003 8:33 AM
> > To: netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
> > Subject: [BackupScripts-L] restoration time
> >
> >
> > hi all,
> > can i have some feedback on how long it takes for you to restore 3 GB
> > of data using netbackup datacenter 3.4 ? thanks
> >
> >
> > _______________________________________________
> > NBU-LSERV AT datastaff DOT com - Advanced NetBackup Scripting Maillist
> > http://dsihost-srv01.com/mailman/listinfo/nbu-lserv
> > Check out the Advanced Scripting Website
> > http://www.NetBackupCentral.com
> >
> >
> >
> >
> > _______________________________________________
> > NBU-LSERV AT datastaff DOT com - Advanced NetBackup Scripting Maillist
> > http://dsihost-srv01.com/mailman/listinfo/nbu-lserv
> > Check out the Advanced Scripting Website
> > http://www.NetBackupCentral.com
> >
> > _______________________________________________
> > NBU-LSERV AT datastaff DOT com - Advanced NetBackup Scripting Maillist
> > http://dsihost-srv01.com/mailman/listinfo/nbu-lserv
> > Check out the Advanced Scripting Website
> > http://www.NetBackupCentral.com
> >
> >
> >
>
>
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