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тАО05-26-2007 07:02 AM
тАО05-26-2007 07:02 AM
Can a host access more than one logical library in a partitioned library?
If it can, how does a backup application differentiate between the two logical libraries ?
Would the device identifiers/serial number returned for an SCSI INQUIRY command be different for the associated medium changer devices ?
Thanks,
penta
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тАО05-26-2007 10:24 AM
тАО05-26-2007 10:24 AM
Re: tape library partitioning
for this question:
"Can a host access more than one logical library in a partitioned library?"
Why do you want to do this?
I cannot imagine any sense...
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО05-26-2007 10:35 AM
тАО05-26-2007 10:35 AM
Re: tape library partitioning
I'm with Torsten on this one, although I got stuck on the fist line...
"Assume a tape library partitioned into two logical libraries."
A tape library will have a defined number of drives and slots at the SCSI level. I can't think of any easy way how that could be split into two logical libraries.
Perhaps if you explained exactly what you're trying to achieve it might make more sense...
Cheers,
Rob
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тАО05-26-2007 10:48 AM
тАО05-26-2007 10:48 AM
Re: tape library partitioning
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
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тАО05-26-2007 06:34 PM
тАО05-26-2007 06:34 PM
Re: tape library partitioning
Suppose the physical tape library has 2 drives and 40 slots and its partitioned into two, giving each partition 1 drive and 20 slots. If the 2 drives are of different types for mixed media support you could do hardware partitioning of the tape library and each partition would cater to a different media type.
My interest is more from a backup application point of view. How do i differentiate in a program between the two partitions assuming that the server can access both.
For example in a program i would
1. Send SCSI inquiry to each medium changer device, and based on the the device identification, serial numbers etc
2. For each different medium changer device detected, i would perform its inventory based by reading element status etc..
SCSI INQUIRY VPD page 0x83(device identification) and 0x80(serial number) output helps me distinguish between different medium changer devices.
In the case of the library partitions in the above would the output for the VPD pages be different or would it have been the same as that returned for the unpartitioned library
Thanks,
penta
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тАО05-28-2007 02:29 AM
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тАО05-29-2007 02:34 AM
тАО05-29-2007 02:34 AM
Re: tape library partitioning
Note that because the serial numbers have to be generated for each partition the serial number you ISV application lists for the library will no longer match the hardware serial number on the library. If you call tech support they will be able to recognize partitioned library serial numbers and point you to the hardware serial number.
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тАО05-29-2007 06:40 PM
тАО05-29-2007 06:40 PM