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тАО03-24-2007 09:54 PM
тАО03-24-2007 09:54 PM
MSL4048 with three Ultrium 920 drives
I'm connecting a MSL4048 with three Ultrium 920 drives which are daisy chained.
The Device Analysis under Library and Tape Tools shows "The Drive has Detected Errors consistent with cabling issues"
Please check your cabling and connections between the host and the Drive"
What could be wrong!
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тАО03-24-2007 10:51 PM
тАО03-24-2007 10:51 PM
Re: MSL4048 with three Ultrium 920 drives
Just a tip.
If this particulars model requires termination, then you need to do the termiantion.
Please check the hardware manual came with the device.
Regards,
Rasheed Tamton.
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тАО03-25-2007 02:16 AM
тАО03-25-2007 02:16 AM
Re: MSL4048 with three Ultrium 920 drives
The Last device is terminated on the SCSI Bus.
The Manual does not offer much help on multi-drive connectivity.Infact have tried swapping the cables as well but still the Library and Tape tools still report errors.
Any help is highly appreciated.
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тАО03-25-2007 12:04 PM
тАО03-25-2007 12:04 PM
Re: MSL4048 with three Ultrium 920 drives
Is it with just one drive or is it with all three?
We don't recommend daisy chaining these drives but that's more a matter of performance than cabling reliability - though you'll have quite a few connectors involved and latest SCSI speeds are very high and more sensitive to cabling issues than they used to be.
If it's not termination (remember - just one terminator at the end) then try reducing the number of drives to see if the problem goes away.
Another thing you could try is the L&TT device performance test. That runs the drives at full speed (one at a time) so you can see what sort of peformance you get from each one independent of the data source and backup app. You might find that one drive goes more slowly if you have cabling issues.
Some things to try at least.
The warnings are not repeated (though you can find them again in the support ticket under drive history->device analysis) so if they continue to be reported it indicates that you are continuing to have problems.
I assume you have a supported HBA with the correct drivers etc.
Good luck. Cabling issues are hard to track down - so start simple and work your way up.
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тАО03-25-2007 09:10 PM
тАО03-25-2007 09:10 PM
Re: MSL4048 with three Ultrium 920 drives
Thanks for your reply and I'll check with one drive at a time to Narrow down.
But,Can the error be because of Daisy Chain.As you said the drives are not recommended to be daisy chained.
Many Thanks.
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тАО03-25-2007 09:30 PM
тАО03-25-2007 09:30 PM
Re: MSL4048 with three Ultrium 920 drives
We advise 1 HBA and cable per drive because of performance - these drives are getting fast. It *is* also more reliable but that doesn't mean your setup shouldn't work. You might find it works with 2 rather than 3 for instance.
You'll have to experiment a bit to find the problem. I'd still recommend going to 2 HBAs - a daisy chain of 3 is pushing it.
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тАО03-27-2007 10:04 AM
тАО03-27-2007 10:04 AM
Re: MSL4048 with three Ultrium 920 drives
The cable lengths that are quoted in the specs are for single cables with no connections.
I have one working bus with 3 devices and it is only capable of 40MBps. Often you will start seeing parity errors with 3 devices on the bus.
We don't recommend it but with Ultrium 920 drives you can daisy chain 2 drives if you have short cables and very clean connections. I would not recommend daisy chaining 3 drives.
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тАО03-28-2007 12:45 AM
тАО03-28-2007 12:45 AM
Re: MSL4048 with three Ultrium 920 drives
I have noticed another thing,the Master Drive shows SCSI ID 4,the Second Drive shows SCSI ID 5 and the third drive again shows SCSI ID 4 again.
Is this correct.
After connecting the drives individually the Assessment test passed on all the three but again the Backup was not able to initiate on the topmost drive.Swapped the Drives but result was same.
Any thoughts!!
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тАО03-28-2007 01:00 AM
тАО03-28-2007 01:00 AM
Re: MSL4048 with three Ultrium 920 drives
We still recommend reducing the length of the chain as per Curtis' findings.
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тАО03-28-2007 02:30 AM
тАО03-28-2007 02:30 AM
Re: MSL4048 with three Ultrium 920 drives
The default ID's are in the MSL G3 family in each half height location are 4/5 then they repeat at 4/5 for the next two half height locations. All full height drives will get the same ID and can not be daisy chained without changing the ID's. Only two half height drives can be daisy chained without changing ID's.