On Wed, 2005-06-22 at 23:05 -0400, Guy wrote: > > -----Original Message----- > > > > > > > will this 24 port card itself will be a bottleneck? > > > > > > > > ming > > > > > > Since the card is PCI-X the only bottleneck on it might be the Processor > > since > > > it is shared with all 24 ports. But I do not know for sure without > > testing it. > > > I personally am going to stick with the new 16 port version. Which is a > > PCI- > > > Express card and has twice the CPU power. Since there are so many > > spindles it > > > should be pretty darn fast. And remember that even tho the drives are > > 150MBps > > > they realistically only do about 25-30MBps. > > > > the problem here is taht each HD can stably deliver 25-30MBps while the > > PCI-x will not arrive that high if have 16 or 24 ports. i do not have a > > chance to try out though. those bus at most arrive 70-80% the claimed > > peak # :P > > Maybe my math is wrong... > But 24 disks at 30 MB/s is 720 MB/s, that is about 68.2% of the PCI-X > bandwidth of 1056 MB/s. yes, u math is better. > > Also, 30 MB/s assumes sequential disk access. That does not occur in the > real world. Only during testing. IMO yes, only during test. but what if people build raid5 base on it, this is probably what people do. and then a disk fail? then a full disk sequential access becomes normal. and disk fail in 24 disk is not so uncommon. > > Guy > > >
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