-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I run disk staging off of SATA drives but in a RAID 0 config to get
both optimal performance and data footprint.  The staging takes
place at a frequency where that covers the fault tolerance.   I get
great performance off of LTO 1 and 2 as well as SAIT.  Cleanups if
a disk fails is a quick script to flush copy 1 of images that have
been staged and it is an allowable loss for those backups which are
destined to DSSUs in that config.  For those clients that can fill
the pipes, we go straight to tape.

Thanks
Peter


Peter DrakeUnderkoffler
Xinupro, LLC
617-834-2352



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
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu at mailman.eng.auburn.edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (FreeBSD)

iD8DBQFGMmzEl+lekZRM55oRAlJNAKDXX0y/RfkuMnl2SzsS7BCr3u8cygCgj2JU
HrVgtSLMg533NZXjS+PWN9s=
=JaMO
-----END PGP SIGNATURE-----