[Gllug] Computer shopping

[Andy Farnsworth]

Ahh, that is true if you do not have a controller that off loads the
processing to itself.  A good IDE RAID controller appears as a SCSI
controller/device to the Computer and the OS.  If you are using a standard
IDE controller or a cheap RAID controller you are correct.

Andy Farnsworth
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> -----Original Message-----
> From: gllug-bounces at linux.co.uk [mailto:gllug-bounces at linux.co.uk]On
> Behalf Of Henrik Morsing
> Sent: July 28 2003 13:09
> To: Greater London Linux Users Group
> Subject: RE: [Gllug] Computer shopping
>
>
>
>
> > IDE drives have now reached 10,000 RPM spindle speeds while
> SCSI has both
> > 10k and 15k for it's high end drives.  I personally prefer IDE,
> especially
> > if you get a good RAID card and IDE Drive cage that supports
> Hot Swapping.
> > The 3Ware controllers support Hot Spares, Hot Swap, and RAID 0, 1, 5, 10
> > and
> > JBOD (Just a Bunch Of Disks).  If you buy the drive cage from 3ware then
> > you
> > get true hot swap support for IDE, even though IDE doesn't support it
> > directly.  You have one drive per channel on the controller so get full
> > bandwidth per drive.  I do suggest you get a 64 bit PCI bus
> preferably at
> > 66
> > Mhz for your server as you will severly limit your RAID
> performance if you
> > go with 32Mbit at 33 Mhz.  Remember that the more spindles per
> RAID volume
> > the faster it is, so 8 100Gb Drives would be faster than 4 200Gb drives.
> > Don't forget to make sure your PS will support the load of all these
> > drives,
> > plus the hot spares (drives plugged in, but not used until a
> drive in the
> > RAID fails, then it will activate it and rebuild the RAID automagically
> > using it and you still have full redundancy).
>
> I sorry to continue this discussion but I have plenty of experience to
> support my views. Your setup only considers disk performance but my
> experience tell me that the more IDE disks you put in a computer (esp.
> RAID)  the slower your CPU gets.
>
> Cheers
>
>
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