On 8/23/11 5:03 AM, Terry Smith wrote:
On 08/23/11 12:57 PM, Ketan wrote:
We are going to buy couple of T3 servers and migrating our Solaris
Zones to Ldoms. I 'm not able to find anything which says about the
max no. of I/O Domains we can have on a T3-1B, T3-1& T3-2. I just
read somewhere that T3-4 can have only 2 I/O domains unlike T5440
which can have 4 I/O Domains. Can some one provide info regarding
this.
Thanks
Ketan
Each T3 socket has _one_ pci bus. So a T3-1B has a single bus, as
does a T3-1, the T3-2 has two and a T3-4 has 4.
Therefore on a T3-1B you can only have _one_ I/O domain and that is
the control (aka primary) domain.
The T3-2 can have up to _two_ I/O domains, the control domain and one
other. however this other I/O domain must boot from external disks as
there is only one disk controller on the T3-2 for th internal disks.
The T3-4 can have up to _four_ I/O domains, the control domain and up
to three others. One of these alternate I/O domain _can_ boot from
the internal disks as there are two disk controllers that each support
up to 4 disks.
The above is true if one has requirement to have I/O domains to
be totally independent, but if I/O performance is the goal then one could
use Direct I/O feature and assign individual PCIe slots to domains there by
creating a lot more I/O domains than the number of PCIe buses that the
system may have.
-Raghuram.
HTH
T
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