On 6/14/07, Khurram Tariq < khurramtm AT gmail DOT com (khurramtm AT gmail DOT 
com)> wrote:
>  By the way In my case I've found out that 2 x FC LTO3 drives with 
> multiplexing and multistreaming gets me the best performance (reached a max 
> of 170MB/s) and adding more drives and streams does not increase the total 
> speed. Any pointers here? 
> 
> Regards,
> Khurram
> 
> 
> 


We need a bigger picture of your environment.

What kind of Sun systems are these?  Maybe you've hit the limits of the system. 

Do you have enough fiber channel bandwidth to the device host and tape drives?  
Sounds like you might be hitting the upper limit of 2Gbit - especially if other 
traffic is going on that link.  Not sure if you are direct attaching the tape 
drives to the host or if you have some kind of tape SAN switch infra.

If the data is coming from over the network client backups..maybe you have a 
network bandwidth issue on the backup host.  170MB/sec though would already 
indicate > Gbit so you'd have to be aggregating more than one link already if 
that is the case.  Add more.

Anyway, it could be lots of things.  You just need to take a hard look at the 
data path and everything along the way to find out the least common denominator.

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