Is you backup speed limited by the drives, or by the speed of the
clients and or network?
I don't know what drives you have, but using a very simplistic view,
your backup of 14TB in 2 1/2 days "only" averages out to 68MB/sec, or 17
MB/sec spread evenly over 4 drives. Obviously it won't be spread evenly
either in time or drives, but we can do a similar sized full backup in a
similar time using one LTO-3 drive. The killer is the incrementals. Data
transfer rate for the incrementals are really quite poor, down to about
2MB/sec for some clients, in contrast to to the fulls where they are
limited by their 100Mb network connection.
best
BrHesseling AT amig DOT com wrote:
> I'm getting it done right now, about 14 TB starting friday at 6 pm till
> Monday at 6:00 am but it is tight. We only have a few Oracle RMAN backups
> right now but we are getting ready to move about 4 TB of Oracle from being
> a cold file level backup to RMAN.
>
>
>
>
> Brian Hesseling
> Storage Administrator
> American Modern Insurance Group
> 7000 Midland Blvd.
> Amelia, OH 45103
> PH: 513.947.6821
> FX:513.388.5117
>
>
>
>
> bobbyrjw@comcast.
> net
> To
> 08/21/2007 01:32 BrHesseling AT amig DOT com,
>
> PM veritas-bu AT mailman.eng.auburn DOT
> edu
> cc
>
> Subject
> Re: [Veritas-bu] Storage Unit
> Recommendations
>
>
>
>
>
>
>
>
>
>
> You are about 12 tape drives short for backing up that number of clients
> with SQL and Oracle and 250 clients.
>
> If your datamover can back up straight to tape, you are much better off
> attaching it direct and getting the NDMP agent.
>
> You will be in a constant fight to get your backups done.
>
> Bobby.
>
>
>
> -------------- Original message --------------
> From: BrHesseling AT amig DOT com
>
> >
> > I am looking for recommendations are configuring storage units. Right
> now
> > the setup is:
> >
> > Master server is directly fiber attached to the library as the robotic
> > control, and directly fiber attached to 2 drives in the library. Media
> > server is directly fiber attached to the other 2 drives in the library.
> My
> > storage units are one for the master with two drives in it and one for
> the
> > media with the other two drives. All of my policies are defined for
> their
> > storage units as Any Available. I am looking to improve the performance
> of
> > my backups, I have 250 clients, with some SQL, Oracle, and NDMP agents
> > sprinkled in.
> >
> > Should I break these up in to individual storage units for each drive
> and
> > the n recombine them into storage groups of one 4 unit group, two 2 unit
>
> > groups, and four 1 unit groups. Then assign the groups directly to the
> > policies? Does that gain me anything?
> >
> > If I want to begin using disk staging do I need to change all of the
> > policies from any available to either the disk storage unit or a tape
> unit?
> >
> >
> > Brian H.
> >
> >
> > -----------------------------------------
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>
--
Chris Freemantle
Data Manager
Wellcome Trust Centre for Neuroimaging
+44 (0)207 833 7496
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