Hi
I have this parameter in place from original tuning of the system, and yes
network backups both to tape and disk units on the master/media work great,
but when duplicating images from the disk units to tape units on the same
media/master, the block size of 64k is simply not enough - because there is
no MPX between disk and tape, so there is only 1 reader process of bpdm for
the 1 writer of bptm, and it looks like the bpdm simply cant keep up.
I say this is the problem, because if on the same machine I stop NBU, mount
a tape and use tar with a larger block size ( ie 128k up ) it is 4 times
faster - and thats using the same image files on disk.
I realise the fragment files on disk would cause netbackup to stop and write
a marker on tape, whereas using tar its a continual stream, but using a
backup product one would expect to be able to tune or setup to match tar (
especially considering NBU uses gnu tar embedded - but I cant seem to see
how to pass it a blocksize argument ).
Regards
Mark
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu]On Behalf Of Coco,
Samuel (Cont, ARL/CISD)
Sent: 16 June 2004 17:02
To: Peter DrakeUnderkoffler; Mark Steel
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] SIZE_DATA_BUFFERS_DISK
Please review the attached:
The known fix is to set the network buffer size file on the UNIX
master/Media server and all clients, especially the WIN/NT clients.
UNIX:
= = =
echo "65536" > /usr/openv/netbackup/NET_BUFFER_SZ
WIN/NT:
= = = = =
On the client (Windows box) create the file <install
location>\VERITAS\NetBackup\NET_BUFFER_SZ with the contents 65536
Related technote is below:
= = = = = = = = = = = = = =
Public Link: http://support.veritas.com/docs/183702
Thank you,
Samuel J. Coco, STG
Functional Area Manager, ARL
Sr UNIX Administrator
BELL 301 394-1151 DSN 290
CELL (B) 240 398-7121 / (H)443 496-1623
HOME 410 604-2415
Email scoco AT arl.army DOT mil
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Peter
DrakeUnderkoffler
Sent: Tuesday, June 15, 2004 9:54 AM
To: Mark Steel
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] SIZE_DATA_BUFFERS_DISK
Mark Steel wrote:
>All
>
>I am having a lot of performance issues duplicating images from disk to
>tape. the bpdm process is reading at 64k from disk, and the manual
>does not have any tuneables.
>
>Looking at the binary, there are several useful looking parameters -
>the
>SIZE_DATA_BUFFERS_DISK looks particularly useful
>
>I've tried putting the file of same name in db/config, but debug still
>indicates the 64k read. I've tred a registry key ( its a windows master
>), no effect.
>
>Anyone use this or have seen it ?
>
>Regards
>Mark
>
>
>
>_______________________________________________
>Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
>http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
>
>
Probably need more info like versions, filesystems, O/S favor etc...
What kind of performance do you get on the filesystem outside of
NetBackup? What kinid of tape performance to you get outside of
NetBackup?
Thanks
Peter
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