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? > _______________________________________________ > Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu > _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu