What kind of data are you sending to the staging area? Destaging doesn't 
use multiplex so as small are your images, as slow will be your 
destaging process.
I had many problems with this, mainly when dealing with Oracle's archive 
logs. Even when using 20 drives just for destaging, it was never enough.
We work with some T10000 tape drives that can write something like 
120MB/s for backups, but when destaging this archive log area, it was 
running at 400KB/s

IMHO, the best thing is to put medium to large backups to staging, 
instead of putting small backups, and configuring the image size to a 
higher value.
This will increase a lot your throughput
regards,
Nick
Em 26/4/2010 11:55, judy_hinchcliffe AT administaff DOT com escreveu:
> I am in agreement with Ed,
> We could backup to disk ok, but getting it of disk to tape took longer
> and we could not get it finished before the next nights backups, and
> that was when we had SDLT tape drives.
> I now have LTO4 drives and backup straight to tape and I still cannot
> keep all the tape drives busy.  So just did not work for us.
> There are times it is needed.
> Some backups, like if you want to do exchange where you can restore just
> one email, needed the backup to be on disk, you could not do that from
> tape.  So you have to look at what kind of backups and restores you do
> and if you need the backup on disk to so the restore.
>
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Victor
> Engle
> Sent: Sunday, April 25, 2010 2:15 PM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Architectural question (staging)
>
> Hello List,
>
> Just wanted to get some opinions about whether disk staging units are
> worthwhile. My backup server has two BasicDisk staging units with the
> storage units configured such that the data goes to disk and is then
> moved to tape. I have a tape library with four LTO-3 drives connected
> via FC. So what I'm wondering is, since the LTO drives are reasonably
> fast, and since I'm writing the data ultimately to tape anyway, would
> it be better to just write directly to tape. The disk is just old
> fashioned spinning disk with no de-duplication so there are
> operational costs for the disks. All tape and disk storage units are
> local to the backup server. I'm thinking it would be better to add LTO
> drives and eliminate the disk for now and maybe later add a
> de-duplicating disk unit.
>
> Under what circumstances does it make sense to stage data on disk. I
> would appreciate hearing what your thoughts and experiences are with
> regard to disk staging.
>
> Thanks,
> Vic
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