Veritas-bu

Re: [Veritas-bu] Anyone have any tweaks for LTO-4 and emulex cards under RHEL5?

2008-04-30 17:51:29
Subject: Re: [Veritas-bu] Anyone have any tweaks for LTO-4 and emulex cards under RHEL5?
From: Justin Piszcz <jpiszcz AT lucidpixels DOT com>
To: Jason Slagle <raistlin AT tacorp DOT net>
Date: Wed, 30 Apr 2008 17:37:48 -0400 (EDT)
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
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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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