The BMC has limited resources and having multiple session may exceed the
CPU or the IPMB bus capacity to the point they can not provide the data
being requested.
>From the IPMI 2.0 specification(June 12, 2009), page 53. " It is not
intended for one system to use this provision to open multiple sessions to
the
BMC for that system’s sole use.".
Large system managers schedule the IPMI transactions via a single RMCP
session and interleave many IPMI operations to smooth out the demands on
the BMC and provide a more consistent loading to the CPU and IPMI Bus. For
example, a replacement for ipmitool called Hemi has "Transaction
Priorities"
http://www.jblade.com/JbDoc2/products/hemi/hemiDC/doc/programmers/HemiTransactions.html
The other advantage to using a single session is that time stamps are
unique because a single CPU(or mulit core CPU) can have a a sequential
counter. This becomes even more valuable when the IPMI System Manager is
20,000+ servers from a single multi core CPU.
Hank Bruning
On Thu, May 23, 2013 at 8:26 AM, Fabio Andrijauskas <biozit.lis...@gmail.com
> wrote:
> Hi all,
>
> I am using ipmitool version 1.8.11 to control a cluster with bmc. I
> succeeded read the temperature with the command ipmitool sdr -I lan -H XXX
> -U 123 -P 123.
>
> Although, another system using the ipmitool -e & -I lanplus -H XXX -U
> 123 -a sol activate to read the same data. I realized that the other system
> having trouble to read the current temperature.
>
> This could be a problem with ipmitool or the problem is that other
> system with a bug ?
>
> Regards,
>
> --
> Fabio
>
>
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