You may see better performance by connecting the tapes and CDL to
different HBAs in different slots on separate busses.

Yes, there's more than enough "bandwidth", but the bus has to reverse
direction to send/receive, so if you have your cards laid out so one bus
is "sending" and the other "receiving" you will see better total
throughput.

Paul

-- 


> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu 
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf 
> Of Chris_Millet
> Sent: November 16, 2007 1:00 PM
> To: VERITAS-BU AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] T2000 vaulting performance with VTL/LTO3
> 
> 
> 
> I'm starting to experiment with the use of T2000 for media 
> servers.  The backup server is a T2000 8 core, 18GB system.  
> There is a Qlogic QLE2462 PCI-E dual port 4Gb adapter in the 
> system that plugs into a Qlogic 5602 switch.  From there, one 
> port is zoned to a EMC CDL 4400 (VTL) and a few HP LTO3 tape 
> drives.  The connectivity is 4Gb from host to switch, and 
> from switch to the VTL.  The tape drive is 2Gb.
> 
> So when using Netbackup Vault to copy a backup done to the 
> VTL to a real tape drive, the backup performance tops out at 
> about 90MB/sec.  If I spin up two jobs to two tape drives, 
> they both go about 45MB/sec.   It seems I've hit a 90MB/sec 
> bottleneck somehow.  I have v240s performing better!
> 
> Write performance to the VTL from incoming client backups 
> over the WAN exceeds the vault performance.
> 
> My next step is to zone the tape drives on one of the HBA 
> ports, and the VTL zoned on the other port.
> 
> I'm using:
> SIZE_DATA_BUFFERS = 262144
> NUMBER_DATA_BUFFERS = 64
> 
> Any other suggestions?
> 
> +-------------------------------------------------------------
> ---------
> |This was sent by cmillet AT qualcomm DOT com via Backup Central.
> |Forward SPAM to abuse AT backupcentral DOT com.
> +-------------------------------------------------------------
> ---------
> 
> 
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> 
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