[Veritas-bu] NBU Data Buffer sizes
2001-05-08 13:09:10
I am assuming this is on the media server? Or does it matter? Or should it
be on both? (assuming separates master/media servers)
As a check on my own math, I have StorageTek 9800 drives. 10MB/s theoretical
maximum write speed, 256k block size.
At some point in the past, I set
/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS to contain 262144 (256k)...
I did this on the master server. I expected restores to break for the 'cut
over' time after I increased blocksize from 64k to 256k, but it did not...
(should it have? Does this mean I'm still using a 64k block size?)
Now, using the below system, I should set
/usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS to be
(10MB/256k)=(10485760/262144) which would give me 40 buffers (per drive)...
Jason
> -----Original Message-----
> From: Marelas, Peter [mailto:MarelP AT AUSTRALIA.Stortek DOT com]
> Sent: May 7, 2001 20:05
> To: 'Tim Allen'; Veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] NBU Data Buffer sizes
>
>
> Tim,
>
> I tend to tune the buffers based on the maximum theoretical throughput
> of the tape drive in question.
>
> However to do so you need memory on the server.
>
> You've got it set to 16 and 64512 respectively.
>
> Therefore Netbackup will use 16*64512=1032192 bytes per tape drive
> in use.
>
> Assuming the maximum theoretical throughput of a drive is 6MB
> I would set SIZE_DATA_BUFFERS to the tape drives optimum block
> size (usually 64k, 128k or 256k).
>
> Lets assume its 64k (65536), divide 6291456 bytes (6MB) by
> 65536 bytes (64k)
> you
> get 96 NUMBER_DATA_BUFFERS. That should be the optimum setting.
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- [Veritas-bu] NBU Data Buffer sizes, Tim Allen
- [Veritas-bu] NBU Data Buffer sizes, Tim Allen
- [Veritas-bu] NBU Data Buffer sizes, Marelas, Peter
- [Veritas-bu] NBU Data Buffer sizes, W. Curtis Preston
- [Veritas-bu] NBU Data Buffer sizes, Tim Allen
- [Veritas-bu] NBU Data Buffer sizes, mander47 AT sca.csc DOT com
- [Veritas-bu] NBU Data Buffer sizes,
Jason Ahrens [ahrensj AT psi DOT ca] <=
- [Veritas-bu] NBU Data Buffer sizes, Marelas, Peter
- [Veritas-bu] NBU Data Buffer Sizes, Dave Pearson (EML)
- [Veritas-bu] NBU Data Buffer sizes, Thomas R Rhodes/TRR/CC01/INEEL/US
- [Veritas-bu] NBU Data Buffer sizes, Marelas, Peter
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