Unfortunately not it was from 2003 regrding the new LTO-3 (when it was 
new) on HP's site, it was a great review/document.

> 16 for number_Data_buffers helped to 32, but after that it showed no 
improvemnet and 256k was best size


On Thu, 1 May 2008, Esson, Paul wrote:

> Justin,
>
> Do you have a link or other reference to the HP doc?
>
> Regards,
>
> Paul Esson
>
> -----Original Message-----
> From: Justin Piszcz [mailto:jpiszcz AT lucidpixels DOT com]
> Sent: 30 April 2008 22:38
> To: Jason Slagle
> Cc: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: Re: [Veritas-bu] Anyone have any tweaks for LTO-4 and emulex
> cardsunder RHEL5?
>
> Btw there was a good HP doc, 32 for the NUMBER_DATA_BUFFERS and 256k for
>
> the SIZE_DATA_BUFFERS is the best.
>
>> 32 (48) was not any better, but 32 > 16 was a definite gain in
> performance.
>
>
> Justin.
>
> On Wed, 30 Apr 2008, Jason Slagle wrote:
>
>>
>> Having just gone through that (Albiet with Qlogic) this is what I did:
>>
>> Make sure the st driver is set to a reasonable buffer size (I did this
> in
>> /etc/modprobe.conf):
>> options st buffer_kbs=1024
>>
>> echo "1048576" >/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS
>> echo "1048576" >/usr/openv/netbackup/db/config/SIZE_DATA_BUFFERS_DISK
>> echo "16" >/usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS
>> echo "16" >/usr/openv/netbackup/db/config/NUMBER_DATA_BUFFERS_DISK
>>
>> echo "kernel.shmmax = 268435456" >>/etc/sysctl.conf
>>
>> echo "65536" >/usr/openv/netbackup/NET_BUFFER_SZ
>>
>> Doing this, I am able to hit 70-80MB/s to the tape from my DSSU, and I
> think
>> I COULD actually go faster, but my DSSU is limiting it.
>>
>> Someone else amy have better values for these to improve it more - I
> would
>> love to hear them also.
>>
>> Jason
>>
>> --
>> Jason Slagle
>> /"\ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> . .
>> \ /   ASCII Ribbon Campaign  .
>> X  - NO HTML/RTF in e-mail  .
>> / \ - NO Word docs in e-mail .
>>
>>
>> On Wed, 30 Apr 2008, Justin Piszcz wrote:
>>
>>> I am only seeing 8-10MiB/s directly from RAM (/dev/shm) where if I
> write
>>> the same data to an LTO-3, I see regular speeds, 60-90MiB/s no
> problems?
>>> _______________________________________________
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>>>
>>
>
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