Dans l'épisode précédent (Fri, May 06 2005 - 09:04), Michael nous apprenait que :
> Hello,
> 
> > 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
> > scsi)
> > - isp0 at pci3 dev 4 function 0: QLogic 1020 Fast Wide SCSI HBA
> > 
> > Both seem quite old and I just can't find docs about their specs,
> > neither on Google, nor on docs.sun.com :( All I know is that the
> > QLogic also has an ethernet port.
> 
> > So I would like to know which of the two cards has the quickest/better
> > SCSI chip... Then I could decide if I use the HME on the SCSI/HME card
> > or use the other SCSI card and plug an Ethernet Quad card.
> 
> You said your QLogic board is fast/wide, that gives 20MB/s for wide-SCSI
> devices. The SymBIOS is ultra-wide which gives you 40MB/s. I'd go for
> the SymBIOS card, it's bootable in the U5 even without specific
> Sun-firmware.
> 

OK, so I'll go with the SymBIOS.

What are the "correct" dd command to check the speed ?

# dd if=/dev/zero of=test bs=1024k count=512
512+0 records in
512+0 records out
536870912 bytes transferred in 19.040 secs (28197001 bytes/sec)
# dd if=/dev/zero of=test bs=1024k count=256 
256+0 records in
256+0 records out
268435456 bytes transferred in 12.282 secs (21856005 bytes/sec)
# dd if=/dev/zero of=test bs=1024k count=128 
128+0 records in
128+0 records out
134217728 bytes transferred in 5.179 secs (25915761 bytes/sec)
# dd if=/dev/zero of=test bs=1024k count=64  
64+0 records in
64+0 records out
67108864 bytes transferred in 1.872 secs (35848752 bytes/sec)
# dd if=/dev/zero of=test bs=1024k count=16 
16+0 records in
16+0 records out
16777216 bytes transferred in 0.404 secs (41527762 bytes/sec)
# dd if=/dev/zero of=test bs=1024k count=3 
3+0 records in
3+0 records out
3145728 bytes transferred in 0.070 secs (44938971 bytes/sec)

I won't often copy 512Mo files but it's funny that biggest file (where
stats should be the most accurate) gets created the slowest.

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