Author: Robert Hyatt
Date: 05:46:08 06/14/01
Go up one level in this thread
On June 13, 2001 at 23:49:05, John Dahlem wrote: >On June 13, 2001 at 22:53:38, Robert Hyatt wrote: > >>On June 13, 2001 at 21:56:12, John Dahlem wrote: >> >>>"I run raid here on several machines. I don't find it to be any faster at all, >>>>for normal cases (raid is definitely slower in writing). The speed of the disk >>>>is not as much a problem as the speed of the PCI bus the data has to move over. >>>>I don't see how you can get 2x the performance with any raid (raid0 or raid5)." >>> >>> >>> >>>When you say in normal cases, are you speaking of chess, or in general? If it >>>isn't faster at all in most cases, what is the point of getting 2 hard drives? >>>I ask because in a computer I am looking at you can get them for about 2-300 >>>dollars more, and I too thought they were about twice as fast as one HD. >>> >>>John >> >> >>Two hard drives can be good at times. IE put the system on one drive, your >>tablebases on the other. Then seeks to the system stuff won't move the read >>write heads away from the data you are accessing. >> >>raid 5 was really designed for fail-safe data storage. raid 0 (striping) can >>be faster, but really only if you have a lot of memory bandwidth to access the >>data in memory quick enough. I haven't seen any cases where raid is >>significantly faster on the PC platforms I have tested. The hot-swap stuff is >>nice for replacing a failed drive, and hot spares are even cuter, of course. > > >Hmm, this computer had 768 megs RAM, which is a lot for PCs, but I don't know if >that is what you mean by a lot or not. When you say it doesn't really benefit >though, are you talking about only in chess or in all applications? Basically, >is raid-0 (or seperate HDs) worth anywhere near $200 in your opinion? memory bandwidth has nothing to do with the _amount_ of RAM you have. raid0 is "ok" on a PC. Nothing more in any I have seen. Is this EIDE raid or SCSI or software?
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