What is the largest SCSI disk drive that can be used with SCO UNIX 5.0.6?

I know SCO is old and outdated, however, I have a Dell PowerEDGE 1400SC with SCSI disk drives using the ad160 adapter.  I'm trying to find out the largest SCSI disk drive that would work with SCO Unix 5.0.6.
I tried the SCO Knowledge Base with no success.

Any help would be appreciated.

TIA,
Dan
scodhkAsked:
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mikelfritzCommented:
I know that 5.0.7 has a 539GB limit - I think 5.0.6 has the same.

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Yes, the cylinder limit in OSR5 disk geometry is 65535.  The exact
geometry is determined by the specific HBA driver.  Most use 255 heads
and 63 sectors/track for large disks.  Multiplying all the maxima:

  65535 * 255 * 63 * 512 bytes/sector

gives a maximum disk size of 539043724800 bytes (539GB or 502GiB).
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That's for 5.0.7, but I found a message regarding 5.0.6 with raid drives:

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SCO 5.06a, HP ML-350, 641 raid comtroller, 3 hard drives 300gb each in
raid 5 witch make 600gb. SCO see only 52gb...!!!

What is the maximum size that SCO can see. Is there a way to fix that
problem.

I've been told that it can see 2tb but I need to adjust my block size to
8192...!!!
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That tells me in the above that one of the disk parameters rolled over the max limit and wrapped back around from zero - hence ~ 50Gig (the sizes given in this one are very general in the post) and makes sense.

What size disk are you looking to use?  I believe 5.0.6 and 5.0.7 had the same limitations on disk parameters, so it seems sensible to say 539GB.  If you are using a RAID array then you might need to limit the size of each volume.  

Also note - if you are installing a fresh system:

http://www.sco.com/support/docs/openserver/506/latenews.html#LN.ad160btld

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Installing with Adaptec 2916x host adapters

If you want to install SCO OpenServer Release 5.0.6 on a device connected to an Adaptec 2916x SCSI host adapter or compatible devices, you must use the ad160 driver from the CD boot image or from the SCSI host adapter Boot Time Loadable Driver (BTLD) disk. The ad160 driver is not included on the primary installation disk, and you will receive "Host adapter not found" error messages if you try to boot from this disk.

If you boot from the installation CD-ROM, the driver will be available for the installation process. If you boot from floppy disks, you must first install the ad160 driver from the SCSI host adapter BTLD disk as described in ``Installing boot-time loadable drivers'' in the SCO OpenServer Handbook. For more information, see ``Boot devices and media'' in the Release Notes.

Installing on Adaptec dual channel host adapters

If you want to install SCO OpenServer Release 5.0.6 on a device connected to an Adaptec 3916x Dual Channel SCSI host adapter or dual Adaptec 2916x SCSI adapters, your CD-ROM and hard drives should be on the primary bus of the first configured adapter. If the devices are attached to different channels or devices, the order of controllers may be changed after reboot and the devices may not be recognized. This is a known bug that will be addressed in a future driver release from Adaptec.
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scodhkAuthor Commented:
Thank you mikelfritz for the information.  That is what I needed.  I have not checked on SCSI drives since I did not know how large they could be.  I am not using raid and the drive would be a 4th drive in the system.

Thanks again for your help,
Dan
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mikelfritzCommented:
Happy to help.  Should be an easy job - mkdev hd, divvy, mount - off to the races...

Post again if you need any help, I'm rusty but we all are on this one.
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