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тАО02-08-2005 01:41 AM
тАО02-08-2005 01:41 AM
What is the purpose of this parameter : num_tachyon_adapters. What is the problem if it is set to 0 when having a tachyon card ? What can it cause if set to more or less than the real number of tachyon adapters ?
Regards,
Fred
"Reality is just a point of view." (P. K. D.)
Solved! Go to Solution.
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тАО02-08-2005 01:52 AM
тАО02-08-2005 01:52 AM
Re: hp-ux num_tachyon_adapters kernel parameter
This seems to be limited nowadays to max 5.
Maybe it allocates too much memory per adapter.
Regards,
Bob
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тАО02-08-2005 01:56 AM
тАО02-08-2005 01:56 AM
Re: hp-ux num_tachyon_adapters kernel parameter
Regards,
Fred
"Reality is just a point of view." (P. K. D.)
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тАО02-08-2005 02:03 AM
тАО02-08-2005 02:03 AM
Re: hp-ux num_tachyon_adapters kernel parameter
The (common sense or real) limit seems to be anyway set to 5.
Most software that change kernel parameters at installation time set this to either 1 or 2.
If you have the adapters or not. :)
For your system with 0 I would set it to 1.
And if, you want to keep your systems in similar configuration then the other one could go from 5 to 1...since there is only one adapter in each machine.
Regards,
Bob
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тАО02-08-2005 02:40 AM
тАО02-08-2005 02:40 AM
Re: hp-ux num_tachyon_adapters kernel parameter
Regards,
Fred
"Reality is just a point of view." (P. K. D.)
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тАО02-08-2005 08:32 AM
тАО02-08-2005 08:32 AM
SolutionIf memory serves the only drawback to setting this parm too high is you will waste resources (the system will use up a certain amount of memory for each one). If set to '0' I believe it will work, but will not set up the memory buffers and therefore may not perform as well.
Also, I am fairly sure this parm only applies to Tachyon cards, not the newer Techlite cards.
David
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тАО02-08-2005 08:45 AM
тАО02-08-2005 08:45 AM
Re: hp-ux num_tachyon_adapters kernel parameter
Here is some additional details (clarifications). No need for points on this one.
num_tachyon_adapters specifies how many Tachyon FCP adapters are installed in the system so that an appropriate amount of memory can be allocated for them at system start-up ***if the system does not provide I/O virtual addressing***.
If your system does not provide I/0 virtual addressing, set num_tachyon_adapters equal to the number of Tachyon FCP adapters actually installed in the machine. During boot-up, the system then reserves a corresponding amount of memory for use by those adapters, varying that amount according to the value of max_fcp_reqs.
If the system supports I/O virtual addressing, set this parameter to zero. The system then automatically allocates memory as needed.
If you do not know whether your system provides I/O virtual addressing, setting this parameter to a non-zero value is harmless, provided the value does not exceed the number of Tachyon FCP adapters actually installed in the system. If the value exceeds the number of installed adapters, a corresponding amount of memory is wasted because it cannot be used for other purposes.
David
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тАО02-08-2005 08:06 PM
тАО02-08-2005 08:06 PM
Re: hp-ux num_tachyon_adapters kernel parameter
I had it set to 0 on one machine and this one was having performance problems. I set it to 1, but it doesn't seem to be really better...
Thanks again,
Fred
"Reality is just a point of view." (P. K. D.)