On 9/5/06, WEAVER, Simon <simon.weaver at astrium.eads.net> wrote:
>
> *I think I understand the question :-(*
> *If you want more streams to write to one media, you need to ensure the
> storage unit multiplexing is set higher (ie: lets say 10 as an example) and
> the Backup Policy SCHEDULE needs to be set to 10. This also assumes you have
> 10 streams in your policy.*
>
Basically I would like to use less media ids and hence increase tape
utilization. the VTLs can grow from 5GB and above.
*As long as Max Concurrent Jobs is set to a high number (ie: 99 jobs) then
> 10 streams would run concurrently at the same time, on the same media.*
> **
> *If you want more streams spread across more media, the schedule within
> the policy should be set lower. In this example, if I have 4 tape drives and
> I set to schedule to 3 streams, then essentially all 4 tapes drives would be
> used for the backups (based on the fact the tapes drives are not in use).*
>
So your opinion is to increase streaming, but if I fire 10 policies at one
go, I wd have 100 streams, 100/10 = 10 medias reqd. The next policy wd
have to go onto a different tape. The VTL has arnd 880 medias spread across
4 drives. So if my operator sees 100 free medias he keeps firing backups
{theres plenty to fire} and this exhausts my tapes.
*Does this help answer the question? Or have I gone off the rails .....*
>
No you have understood the question, but need more help in devising both
policies and techniques in utlizing the Virtual tapes. The virtual tapes can
grow in size but the media ids are limited. I want the backups to use less
media ids. We have arn 1500 streams per day, the VTL media mux is 4, ie
1500/4 = 375
Somehow I aint getting it right :(
*Regards*
>
> *Simon Weaver
> 3rd Line Technical Support
> Windows Domain Administrator*
>
> *EADS Astrium Limited, B23AA IM (DCS)*
> *Anchorage Road, Portsmouth, PO3 5PU*
>
> *Email: **Simon.Weaver at Astrium-eads.net* <Simon.Weaver at Astrium-eads.net>
>
> -----Original Message-----
> *From:* Veritas Netbackup [mailto:backupicici at gmail.com]
> *Sent:* 05 September 2006 12:46
> *To:* veritas-bu at mailman.eng.auburn.edu
> *Subject:* [Veritas-bu] Netbackup VTL tuning
>
> Hi List,
>
> We have a Clariion Disk Library with MPx set to 4.
>
> At the momment the admins fire backups and after 4 streams of backup are
> started, a new media is used to write the backup.
>
> Since the CDL tapes can grow from a minimum of 4 GB to whatever size is
> available in the volume, it seems to me that the tape utilization is not
> optimum.
>
> As a consequence I need to consequently free medias and add the to
> SCRATCHPOOL OR provide less medias in SCRATCHPOOL so as to limit them from
> firing too many consequitve backups.
>
> Any suggestions for this scenario??? Shd we disable multistreaming in the
> policy??? Will this increase tape util??
>
> Any suggestions for a VTL & netbackup combination to increase performance
> and tape utilization are welcome.
>
> Regards,
> PP BIJU KRISHNAN
>
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