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тАО06-26-2009 08:28 AM
тАО06-26-2009 08:28 AM
Ultrium 920 1/8 G2 Autoloader reports 160MB/S not 320
LT&T reports that the SCSI speed is only 160MB/S and hence limiting performance.
The writing on the terminator says it is an Ultra 320 LDV/SE terminator. Is this a type that will work in either differential or SE mode and does the led indicate this by changing colour, or is it just a power indicator? The led is green.
Any suggestions to determine if the speed really is only 160MB/S and if so whether it is the HBA, autoloader, cabling or termination would be appreciated.
Thanks,
Vince
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тАО06-27-2009 11:04 AM
тАО06-27-2009 11:04 AM
Re: Ultrium 920 1/8 G2 Autoloader reports 160MB/S not 320
Pablo Alvarado Siles
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тАО06-28-2009 09:46 AM
тАО06-28-2009 09:46 AM
Re: Ultrium 920 1/8 G2 Autoloader reports 160MB/S not 320
To quote from the motherboard manual 'The PCI Express x1 supports up to 250MB/s transfer rate.'
Does this answer your suggestion? Sorry, but bus speeds and HBAs are not really my field. I will ask our supplier to confirm.
Thanks
Vince
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тАО07-01-2009 09:04 AM
тАО07-01-2009 09:04 AM
Re: Ultrium 920 1/8 G2 Autoloader reports 160MB/S not 320
The first think I always check with parallel SCSI is to pull/plug the SCSI cables and terminator at every connection several times to make certain the connections are perfectly clean. Once that is done it's a matter of testing different driver and HBA firmware revisions to see if there is a firmware issue.
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тАО07-01-2009 09:33 AM
тАО07-01-2009 09:33 AM
Re: Ultrium 920 1/8 G2 Autoloader reports 160MB/S not 320
That is a good question. After consideration, it doesn't matter that much. I guess I was bullied into worrying about it by the HP diagnostics nagging about it. I was investigating why it took so long to archive a 100GB file, and saw the 160/320 warning in passing.
Having looked further, the real issue would appear to be the data transfer from the disk drives is the bottleneck and obviously not for discussion in this forum.
Having spent quite a bit on the autoloader, we should consider a higher performance machine to run it.
Thanks everyone for the advice.
Vince Leatt
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тАО07-01-2009 09:38 AM
тАО07-01-2009 09:38 AM