SCSI disk drive does not power-up

[Srividhya Narayanan]

Hi,

In our development machine, the alternate boot disk does not power-up and It does not show up in the "ioscan -C disk". I dont know how this happened, can anyone tell me what is wrong???

Thanks for your help
Sri.

[Rick Garland]

If not powering up, are all connections OK? Does ioscan show an UNCLAIMED?
Could be that the disk drive needs replacement.

[Rick Garland]

If you have DIAGS loaded, can use stm (cstm, xstm, or mstm) to view the hardware of the system. This will provide you with more info.

[Stefan Farrelly]

If it doesnt showup in ioscan then their is no physical connection to the drive. Either the drive has failed and not powered up, or else the connection to the drive is faulty. Have you checked the SCSI cable to the drive is nice and tight ? Try that first, or else power off the box completely and power it on again and see if it comes up. A disk powering down then up or not powering on all the time is a sure sign its on its way to disk heaven.

[Srividhya Narayanan]

The connections are ok, when i put another unused disk on that slot it works. No the ioscan does not show anything unclaimed.

Thanks
Sri

[Antoanetta Naghiu]

Was this disk ever functioning with this box or is new?
Is it an external disk? If yes, check the cable, the connection (even the power-on button). Does the disk have a properly terminator?
If the disk is internal one, probable is toasted.
Follow Rick advive with diagnostics if you have them installed.

[Rick Garland]

You have a bad drive that sounds like it needs replacement.

Is this drive the same type, i.e. FWD, as the drive you just swapped in?
This could cause waht you are seeing as well.

[Srividhya Narayanan]

I tried to shutdown completely and startup, it still didnt power-up. as you say the disk must be bad and needs replacement.

yes it was the same type of disk that i swapped, is that wrong??? i thought swapping with a unused disk wouldnt cause any problems.

Thanks
Sri

[Srividhya Narayanan]

This is a internal disk. No I dont have DIAGS installed, i think i'll go with the replacement of the disk. Thanks so much to all of you for such quick response to my issue.

Regards,
Sri

[Rick Garland]

You will want the same type of disk. Typically FWD disks.

All disks on the bus should be the same type as the bus is typically differential as well. If the disk is not FWD, you would not see any devicesa on the bus.

Appears the disk is bad.

[Stefan Farrelly]

Your right, swapping disks on the fly (on a Jamaica?) and then doing an ioscan should be fine, I do it here all the time. Doesnt even have to be the same type/model/size of disk.