Your slow restore response time is the main reason we do not use
multiplexing.  Yeah your backup window is shorter, however restore
performance is dramatically reduced.


Ebon Nash

-----Original Message-----
From: Sen [mailto:discussion.groups AT gmx DOT net]
Sent: Friday, April 18, 2003 11:22 AM
To: Steve Dvorak; Christopher Baughman
Cc: netbackup-l; nbu-lserv; veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] 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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