Hi,

You are correct and I am aware of I can calculate a theoretical maximum. But in 
my world there is no definitely 
equal sign between theory and practice. Hence the question about your 
experience.

Thanks
Henrik


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ads...@vm.marist.edu] On Behalf Of Remco 
Post
Sent: den 29 januari 2010 07:41
To: ADSM-L@vm.marist.edu
Subject: Re: [ADSM-L] Linux - number of drives/daily backup size

On 28 jan 2010, at 21:47, Henrik Vahlstedt wrote:

> Hi,
> 
> Based on your experience. 
> What is maximum number of drives, LTO4 or J3/T10KB, and still having an 
> excellent performance when everything is used at the same time in a Linux 
> server?
> 

calculate the bandwidth of your PCI bus/slot in Gb/s
        - you can only have one 4 Gb/s HBA working at 100% capacity on a PCI-X 
133 bus
        - 10 Gb/s ethernet requires PCI-X 266 or a suitable PCIe slot
calculate the bandwidth requirements of your drive
        - you can have maybe 2 or 3 high-speed drives per HBA



> Size of daily backups?
> Server model?
> Drive type?
> 
> Assumptions are larger models of HP or IBM servers on Intel/AMD, with SAN 
> storage and 10 GigE.
> 
> 
> Thanks
> Henrik
> 
> 
> 
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Met vriendelijke groeten/Kind regards,

Remco Post


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