If you only have one RAID set, than make sure that MultiStreaming is turned
off for that client. Also, as I stated before, use 2-3 streams for
Multiplexing(MPX). If you can meet your backup window without MPX then set
it to 1.
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 10:28 PM
To: Steve Dvorak; Christopher Baughman
Cc: netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [BackupScripts-L] restoration time
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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