new to me 7600

[Unknown_K]

Look around, there are some deals on ebay for ATTO cards. I snagged an UL2D (64 bit PCI for B&Ws for $6 shipped a little while ago).

You realy want an acard ATA/66 or better IDE PCI card, and they can be had for $40 or so. Sure you can get a SCSI 160 card and 15K RPM drive but its for a 7600, you don't need all that speed. Decent EIDE HDs even the old 40GB ones are much faster then the stock SCSI+Drive the 7600 came with, and EIDE drives are easier to find.

 

[sylwiusz]

what about using a sonnet tempo 133 ide card. that would run close to the 160 mbps correct. it would be much faster than the scsi 2 or am i wrong. i have several ide 133 drives and a tempo 133.

You're wrong. 133 MB/s is only teoretical max speed of this IDE incarnation. You'l never achieve this speed just because it's maximum speed of 32-bit PCI bus and you need part of this throughput for other PCI activity. And no single IDE disk can achieve this speed. As a matter of fact single Serial ATA disks in my G5/dual core/2 GHz achieve about 50 MB/s according to Xbench.

also i have been looking for the atto card and they are like $200+ what gives?

Be patient and you'll find it cheaply. Look for UL3S, UL3D, UL2D like this one:

http://cgi.ebay.com/Lot-5-ATTO-ExpressPCI-UL3D-EPCI-UL3D-000-Host-Adapter_W0QQitemZ110263780395QQihZ001QQcategoryZ90716QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[sylwiusz]

Look around, there are some deals on ebay for ATTO cards. I snagged an UL2D (64 bit PCI for B&Ws for $6 shipped a little while ago).

Yup, no problems finding these, and 64-bit versions work in 32-bit PCI too ;-)

You realy want an acard ATA/66 or better IDE PCI card, and they can be had for $40 or so.

I have Tempo Ultra-ATA 66 and I was using it before ATTO. No comparison. Modern IDE disk connected to this card didn't achieve even half of read and write transfer of Ultra 3 SCSI disk (30 vs 67 MB/s read and 19 vs 38 MB/s write respectively). Add to this shorter seek time of high RPMS SCSI disk which come in account when you'll have somewhat defragmented disk and you'll know why why SCSI is still worth more than IDE...

Sure you can get a SCSI 160 card and 15K RPM drive but its for a 7600, you don't need all that speed. Decent EIDE HDs even the old 40GB ones are much faster then the stock SCSI+Drive the 7600 came with, and EIDE drives are easier to find.

BTW - I just acquired modern (2005) Fujitsu 73 GB 10000 RMPMs disk for 30$ - extremly fast and plenty of space for use in 7600 BTW - did I mention that SCSI disks usually have much longer MTBF timing - 1200000 hours vs 750000 hours? This means that SCSI disks are usually built using higher quality elements and there's less chance of its failure - important especially when you buy it second hand ;-)

 

[Quadraman]

Tell me something, if ATA 133 cards on the PCI bus can't achieve their maximum throughput then how does an Ultra 3 SCSI perform so much faster with a higher theoretical maximum and facing the same PCI bus issues? That defies all logic. The onboard SCSI can't come close to achieving Ultra 3 speeds so how are you getting such high performance out of yours? An Ultra 3 SCSI drive attached to a card on the PCI bus should have the same bottlenecks as an ATA 133 drive and not perform any faster at all.

 

[sylwiusz]

Well, 67 MB/s achieved by my Ultra 3 SCSI disk is merely half of PCI transfer capabilities (133 MB/s). Why does IDE disk have lower transfer rates - I don't know, perhaps it is my Barracuda 40 GB taken from G4 MDD that is slower, but I don't have other modern IDE disks to test them with Tempo Ultra ATA 66, but judging after results that I got from modern Serial ATA disk in G5 - (WD2000JS - about 50 MB/s according to Xbench), it seems that Ultra 3 SCSI wins.

But if you're pointing to my previous reply on ATA-133 vs. SCSI 160 speed, I can only say that real world disk <-> controller transfer speeds are far from theoretical possibilities. These higher speeds perhaps would make a sense in case of RAID configurations.

 

[Unknown_K]

SCSI drivers were never built better then the same companies IDE drives, you paid extra for more QC testing and the longer warrenty.

Be carefull stufffing hot running scsi drives in a 7600 (plastic cased computer), it might overheat.

If you use a newer IDE HD on an ATA card you will see very decent speed out of it. PCI IDE cards tended to have trouble on PCI powermacs, some came with a utility to keep audio/video from stuttering (problem with the PCI bus).

 

[madmann]

great info i am looking for the atto card.

although routing the scsi cable in the 7600 case will be a challenge

cut and hack i suppose?

 

[sylwiusz]

Why challenge? I just removed small metal plate from the left side of upper chassis and it created perfect pass through for even quite stiff LVD cable

 

[paws]

great info i am looking for the atto card.
although routing the scsi cable in the 7600 case will be a challenge

cut and hack i suppose?

Can't you just run it through the bottom of the drive assembly like the normal SCSI cables?

 

[madmann]

i have looked for a plate and found none. The drives are in a box (open top) that rotates over to access the mobo. there are a set of holes for air flow on the left what could be opened up nicley to access the pci slots.

the existing cable routes between the side of this box and the power supply. the distance between them is that of the ribbon cable thickness.

the g3 has a slot added to the bottom of the box to allow the ide cables to get to the drives with out routing between the case and power supply

i guess i am not following

[?]

 

[sylwiusz]

I found this in manual of Adaptec 2940:

I hope it will be helpful enough

 

[paws]

Oh, that's quite different to my 7300. Weird.

 

[madmann]

i am with you at first i thought that panel was spot welded into place but it is removable thanks