Re: [Veritas-bu] Anyone have any tweaks for LTO-4 and emulex cards under RHEL5?
2008-04-30 10:12:53
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
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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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