Veritas-bu

Re: [Veritas-bu] Storage Unit Recommendations

2007-08-22 12:11:26
Subject: Re: [Veritas-bu] Storage Unit Recommendations
From: "Cruice, Daniel \(US - Glen Mills\)" <dcruice AT deloitte DOT com>
To: "Chris Freemantle" <chris AT fil.ion.ucl.ac DOT uk>, <BrHesseling AT amig DOT com>
Date: Wed, 22 Aug 2007 11:46:31 -0400
We had a very similar situation where we have backups running for 3
days.  We were getting very good thru put but just the volume of data
getting backed up was killing us.  We had Mutliplexing enable which
helped but still running for days.  We just implemented Multisteaming on
our bigger servers, assuming you have the data carved up by drive
letters, mutlisteaming works GREAT, what NBU will do is takes each drive
letter and creates separate jobs so C: / D: / E: etc all get backed up
simultaneously. It took our 3 day backup down to only 21 hours.

Now if you are looking into Disk Staging, then you will need to assign
your policies to the disk storage group.  Then subsequently use the
Staging Schedule under that storage unit to send the disk staged data to
tape.  You will want to ensure you have enough disk storage to handle
the task.  Once the data is sent to tape, NBU will assign each image
with a ds prefix.  This way NBU knows that the data was sent to tape and
in the event your disk becomes full or hits your high water mark, NBU
will remove the oldest .ds file first.  The .ds is also used when your
job retention period has come and gone.  NBU will go in a delete the .ds
files when they expire.

Thanks
Dan
-----Original Message-----
From: Chris Freemantle [mailto:chris AT fil.ion.ucl.ac DOT uk] 
Sent: Wednesday, August 22, 2007 11:17 AM
To: BrHesseling AT amig DOT com
Cc: bobbyrjw AT comcast DOT net; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Storage Unit Recommendations

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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