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LTO-4 HP autoloader 1x8 SAS

Posted on 2009-02-16
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I have an SAS autoloader HP 1x8 that connects to a HP DL380  G5 Server using a HP SC44Ge card on the card the spec show as 8 SAS ports connectoers is 1x4 / 1x4 (external/Internal)

Is it possiable with a single to multiple SAS cable to connect more then 1 SAS LTO4 autoloader to the same card

Would it work?
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Question by:gian514
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by:Randy_Bojangles
ID: 23652109
Yes you can attach more than one drive to the card

BUT

Throughput will suffer accordingly so unless you have no spare slots and/or money is really tight (the card is only around $120) then I'd have a seprate card per tape drive.
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by:gian514
ID: 23652793
I'm not sure if the Performance loss would be an issue on a SAS card.
I understand that issue on a scsi card but on a SAS the conection are point to point and the card could handle 4 external connections. I'm guessing that a specail cable that links to the card 1 x4 cable
and in the HP sc44ge spec's it does say a peek rate of 3GB/sec per port
So I guess my question is does this 1x4 cable work for an autoloader or is this for attaching SAS disk array to the server.
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Randy_Bojangles earned 750 total points
ID: 23652920
It's the interface between the card and the board (the PCIe slot) that I can see being the bottleneck if you are trying to move the data for two backup jobs across it at once.

I have scoured the quickspecs and online resources and cant find anything that says definitively what the supported number of tape drives is. You can use it with a SAS library so it can see the drive and robotics at same time so I see no reason why you cant attach two tape drives but cant give you a physical statement from HP to refer to

Sorry

Andy
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