O2 hd SCSI replacement question - Printable Version
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O2 hd SCSI replacement question - overlogic2011 - 01-15-2022
Hello,
I did a search on the web for some scsi hdd to replace one on my O2. Found a cheap 18gb scsi-3 seagate 80 pin cheetah st318451lc.
But i don't have sure if it's compatible, i only found info about generic hdds, like toshiba, fujitsu IBM and others. I would like to know if this particular hdd i have mentioned is compatible, if someone already have it, etc. Any help will be much apreciated. thanks!
RE: O2 hd SCSI replacement question - weblacky - 01-15-2022
Any 1” (low profile) SCA 80 SCSI drive will work. Though you’ll want to try to avoid 15K RPM or higher due to noise and heat. But all SCA 80 pin connector drives follow the same physical dimensions and connector.
I doubt you’ll have an issue with the drive you want as long as it’s 1” thick and not half height (which physically won’t fit into O2).
RE: O2 hd SCSI replacement question - overlogic2011 - 01-15-2022
Ok weblacky, thanks for the info. I guess this one is 15000 rpm, but it's late i already got him. Do you know a command to display the partitions of the hdd? Thanks!
RE: O2 hd SCSI replacement question - weblacky - 01-15-2022
SGIs use a completely different partition table format that any other platform. So it’s not MBR or GPT or the like. They use what they call a disk label (very advanced btw).
So you’ll need to rephrase your question to be more specific. If you want to look at any SGI partitions okay, otherwise Irix is rather destructive if the disk does not contain an SGI partition table, it will forcibly create a blank one without your consent when you enter the partition program in Irix.
So if you’re asking me to view a non-SGI partition table on an SGI, I do not know any way to do that. Non-SGI partitions are only supported by a few forms of removable media (floppy, ZIP, etc).
Otherwise if you’re curious I’d assume you need a Linux box with a SCSI card and correct adapter to view it under Linux which can see SGI, MBR, and GPT tables correctly.
RE: O2 hd SCSI replacement question - robespierre - 01-15-2022
Yes, it is compatible. Any off-the-shelf SCSI disk with a SCA-2 connector is compatible with the O2.
In general, SCSI is completely forward and backward compatible, with the following exceptions:
• High voltage differential (HVD) devices are only compatible with HVD bus adapters and vice-versa. Connecting a HVD device or bus adapter to any single-ended (SE), low voltage differential (LVD), or multimode bus or device risks permanent circuit damage as a result of the much higher voltages used in HVD. Note that as far as I know, HVD devices never have SCA-2 connectors.
• Narrow (8-bit) and Wide (16-bit) devices can sometimes coexist, but there are a number of special considerations when doing so. You should look up "high byte termination" to find out what's involved.
RE: O2 hd SCSI replacement question - overlogic2011 - 01-15-2022
Thanks robespierre for reply! And weblacky, i am Just curious about fx command, if i can visualize any sgi partitions before creating one. Thanks.
RE: O2 hd SCSI replacement question - weblacky - 01-16-2022
Not really, FX is sort of single purpose and not very exploratory. Your supposed to just say if the disk is for ROOT, USR, or Home usage (basically). It does a lot without asking when your exploring or selecting options. I’d suggest you read up on it in the SGI admin guides versus fool with it. You can get yourself into a bad way misusing FX. SERIOUSLY, it’s not fdisk and it can do bad things like take you into a low level format you didn’t expect and hope you come out the other side.
Not for fiddling with a drive you care about!
RE: O2 hd SCSI replacement question - overlogic2011 - 01-16-2022
Got it weblacky, thanks!
RE: O2 hd SCSI replacement question - overlogic2011 - 01-18-2022
I am trying to find some tutorials or info about place a second hdd scsi on O2, since i found an secondary slot on my O2.
I just want to know , when i plug a clean secondary hdd on O2 , what i need to do? repartition it? How i do that and my system will recognize it as more space on system? Or just another hdd drive? Sorry, i'm very beginner , any help will be much apreciated. Thanks!
RE: O2 hd SCSI replacement question - wroteafaq - 01-18-2022
(Stop me if I say anything obsolete here...)
What you need is a primer in Unix administration. In this case you're partitioning it (not "repartitioning", as a clean disk will have no partitions on it) with fx. Since most of my time is with older versions of fx, the warnings above about how easy it is for it to get away from you are news to me - I've never found it to be an uncivilized tool. Anyway, fx is the disk maintenance program that will test, partition, and label the disk in preparation for use. Then you make a filesystem (or filesystems) with mkfs, then you can mount those filesystems on the "mount points" in the existing file system that you wish.
That's the thumbnail version.