VM Server For SPARC: LDC Channel's (Doc ID 1967017.1)

Last updated on FEBRUARY 23, 2017

Applies to:

Solaris Operating System - Version 10 3/05 to 11.2 [Release 10.0 to 11.0]
Oracle Solaris on SPARC (64-bit)

Goal

The goal here is to give fundamentals about LDC in Sparc architecture

 

What is a LDC ?

An LDC is a point to point connection through the systems firmware that is use to setup connections between any virtual service.
I.e. vnet/vsw, vdisk and vconsoles.
There is currently a hard limited number of LDC a domain can use.
This is per domain and NOT system wide.

 

For example, an enhantments in LDOM’s 3.1.1.1 (s11.2 SRU2) with SysFW T4 with SysFW 8.5.2 and T5, M5, M6 with SysFW 9.2.1 on the T4 has increased that number to 1984 LDCs per domain, 98304 LDC endpoints total. You should not be able to bind more service resources than LDC resources you have available depending on the system and firmware installed.The ldom commands will police this and will not allow you to use over this hard limit. The ldm command will error, when you bind the resource.
Normally the domain subject to hit that limitation is indeed the control domain (sometimes call the primary domain) and service domains(sometimes call the secondary domain) because it is where the virtual devices gets created, managed and converge.

 

With LDOM version 3.4.0.3, depending of system firmware, a larger pool of LDC endpoints is offered and that you can use for the control domain and guest domains.

http://docs.oracle.com/cd/E69554_01/html/E83161/docissues.html#LDSRHldcendpointpools

This LDC endpoint pool is available starting with the SPARC T4 servers and Fujitsu M10 servers.

The number of LDCs in the pool is based on the platform type as follows:

     SPARC T4 Server – 1984 LDC endpoints per logical domain

     SPARC T5 Server – 4080 LDC endpoints per logical domain

     SPARC T7 Series Server – 4080 LDC endpoints per logical domain

     SPARC M5 Server – 4080 LDC endpoints per logical domain

     SPARC M6 Server – 4080 LDC endpoints per logical domain

     SPARC M7 Series Server – 4080 LDC endpoints per logical domain

     Fujitsu M10 Server – 4080 LDC endpoints per logical domain

     SPARC S7 Series Server – 4080 LDC endpoints per logical domain

Solution

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