I built my own machine, with 7 raptors RAID5 sw raid I get 320-425MB/s 
read and write.  Reading from 10 of the drives at the same time, I see 
750MB/s aggregate bandwidth, but you'd ned a 10GBps to get the data off 
because 1gbps is capped at 125MB/s obviously.

Justin.

On Fri, 27 Apr 2007, Martin, Jonathan (Contractor) wrote:

> Before the "SATA Sux" crowd gets going here I'll just say this:
>
> I run 14 x 5 SATAII 500GB Disks in a Raid 5 and get better than
> 200MB/sec writes and easily drive LTO3 to 130MB/sec.  That said, I'm
> running completely different hardware, Dell server & storage.  Raid 5,
> qlogic HBAs & PERC Raid Controllers.
>
> The best thing anyone on this list ever said to me when I was in your
> shoes was forget about Netbackup.  How fast can you copy data from point
> a to point b on your solution?  Then how fast can you multistream FTPs
> to the same solution?  Once you get those numbers into the range you are
> expecting then you can start to performance tune NBU.  Until then, your
> buffer settings are a waste of time.
>
> -Jonathan
>
> ________________________________
>
> From: veritas-bu-bounces at mailman.eng.auburn.edu
> [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Navarro,
> Eddy A.
> Sent: Friday, April 27, 2007 5:10 PM
> To: veritas-bu at mailman.eng.auburn.edu
> Subject: [Veritas-bu] SATA disk backup performance
>
>
>
> Gurus,
>
>
>
> I've been doing some performance testing of backing up to a Disk Storage
> Unit of SATA disk.  We have the following:
>
>
>
> Netbackup 5.1 MP6
>
> SunFire V800 running Solaris 9 with 8GB RAM
>
> Veritas Volume Manager 4.1
>
> CX700 array with 500GB 7200rpm SATA drives
>
> Emulex LP9000 HBA
>
>
>
> I've been doing all sorts of tweaking, from adjusting the disk buffer
> files per http://seer.entsupport.symantec.com/docs/273532.htm, cranking
> up the write cache on the CX700 to over 2GB, changing the RAID layouts,
> but I just cannot get performance better than 15MB/s.  Surely backing up
> to SATA can produce better results than that?
>
>
>
> Currently, I've got six 500GB LUNs each in their own 4+1 RAID group
> using RAID3.  These LUNs are then striped into a RAID0 volume using
> Veritas Volume manager (at first I tested with a striped MetaLun on the
> array, but results were no different).
>
>
>
> As stated, I've tweaked till I'm blue in the face but I can't seem to
> squeeze anything above 15MB/s.  Any hints as to what I could be
> overlooking?  Performance is not looking good compared to our NDMP
> backups to LTO-2 tape which run at the nice clip of ~35MB/s.
>
>
>
> Thanks,
>
> Eddy
>
>