Thanks btw ;)

On Wed, 30 Apr 2008, Justin Piszcz wrote:

> Yeah yeah that was it I figured it after I sent the e-mail I was in a rush to 
> get these new serves up and forgot about the SIZE_* vars, getting 100MiB/s 
> per tape drive now no problems.
>
> 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
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>> 
>> 
>> 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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