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On Fri, May 06 2005 - 17:10, Eduardo Horvath wrote:
> On Fri, May 06, 2005 at 10:14:50AM +0200, Joel CARNAT wrote:
>=20
> > Now that my U5 is up and working OK for 15 days (with 2.0.2), I wanted
> > to swap the IDE disk to an SCSI one. I have two differents cards :
> > - esiop0 at pci2 dev 1 function 0: Symbios Logic 53c875 (ultra-wide scs=
i)
> > - isp0 at pci3 dev 4 function 0: QLogic 1020 Fast Wide SCSI HBA
>=20
> Is that a Sun card or directly from QLogic?  I wasn't aware Sun sold 1020=
s,
> just the 1040s.
>=20

 Looks like a Sun card - One of the chip has the SUN logo on it.

> > Both seem quite old and I just can't find docs about their specs, neith=
er
> > on Google, nor on docs.sun.com :( All I know is that the QLogic also has
> > an ethernet port.
>=20
> The glm (Symbios card) can do faster bus transfers.  The isp is an extrem=
ely
> intelligent card and is capable of doing >1 interrupt/command.  (Yes, I do
> mean multiple commands/interrupt.)  So which one you want to use depends
> on the speed and number of drives on the SCSI bus.  If you have drives th=
at
> can support ultra speeds and can transfer more than 20MB/s sustained,=20
> you probably want to go with the glm.  If you do mostly sequential I/O
> the glm is probably better.  If you have slower disks or multiple disks on
> the spindle, the isp may be better.  If you do lots of random seeks then
> the isp will definitely be better.  And if you are CPU bound, definitely
> go with the isp.
>=20

 SymBIOS is going to be plugged then !

thX

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