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? >> _______________________________________________ >> 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
