From: Edson Noboru Yamada (eyamada@diveo.net.br)
Date: Thu Jun 02 2005 - 16:45:36 EDT
Answers to my questions:
a) Is the PCI slot a bottleneck? What is the sustained traffic that a slot
like that support?
Most people said NO.
Doug Bell described how to calculate the PCI Bus bandwidth:
"If you want real numbers, you can do the math to get really close.. 64 bits
X
66MHz / 8 bits per byte X 0.6 (back of the envelope modifier for overhead) =
316,800,000 bytes per second"
Some others have not pointed out the overhead, though.
b) Is the SCSI host adapter a bottleneck? Again, how many MB/s can pass
through each port?
This depennds on the specific card. ULtra 3 cards can support 320 MB/s.
Some people pointed out some likely bottlenecks:
a) network interface
b) clients with many small files
Thank you very much.
>Hi
>
>I4m using a V480 as a backup server (Veritas Netbackup).
>
>Th server has a PCI Dual Ultra3 SCSI Host Adapter (LVD) connected to
>a 66 MHz PCI slot, which has two ports, and each port is connected
>to two drives.
>
>My concerns:
>
>a) Is the PCI slot a bottleneck? What is the sustained traffic that a slot
>like that support?
>
>b) Is the SCSI host adapter a bottleneck? Again, how many MB/s can pass
>through
>each port?
>
>I know that my drives have a theoretical capacity of 60 MB/s.
>
>Thanks
>_______________________________________________
>sunmanagers mailing list
>sunmanagers@sunmanagers.org
>http://www.sunmanagers.org/mailman/listinfo/sunmanagers
>
>
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