FAQ Search Today's Posts Mark Forums Read
» Video Reviews

» Linux Archive

Linux-archive is a website aiming to archive linux email lists and to make them easily accessible for linux users/developers.


» Sponsor

» Partners

» Sponsor

Go Back   Linux Archive > Gentoo > Gentoo User

 
 
LinkBack Thread Tools
 
Old 02-15-2008, 11:42 PM
Mark Kirkwood
 
Default Looking for PCI-X external SATA controller

I wrote:

I think 64-bit 66Mhz PCI will actually do 526Mb/s theoretical maximum
... I can achieve 220Mb/s real I/O bandwidth (4 disk array) on my gear
here. (old Supermicro P4TDER).


Actually, doing the calculation properly gets 508 MB/s (532 MB/s is
often quoted, but that is using 1000 instead of 1024 bytes to the
Mbyte). For the interested:


32-bit 33.33 Mhz PCI bus can transfer 32*33.33*1000000/(8*1024*1024) =
127 MB/s
32-bit 66.66 MHz PCI bus can transfer 32*66.66*1000000/(8*1024*1024) =
254 MB/s

64-bit 66.66 MHz PCI bus can transfer (skip obvious calc now) 508 MB/s

Clearly PCI-X with its 100, 133.33 and 266.66 MHz variants will get you
763, 1017 and 2034 MB/s.


Cheers

Mark

P.S : also typo'ed the machine - is a P3TDER...
--
gentoo-user@lists.gentoo.org mailing list
 

Thread Tools




All times are GMT. The time now is 09:52 AM.

VBulletin, Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO ©2007, Crawlability, Inc.
Copyright 2007 - 2008, www.linux-archive.org