Reasons for NOT using LDOMs? reliability?

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Operating Systems Solaris Reasons for NOT using LDOMs? reliability?
# 1  
Old 08-27-2013
Question Reasons for NOT using LDOMs? reliability?

Dear Solaris Experts,

We are upgrading from sun4u to T4 systems and one proposal is to use LDOMs and also zones within LDOMs.

Someone advised using only zones and not LDOMs because the new machines have fewer chips and if a chip or a core fails then it doesn't impact the zones, but impacts the corresponding LDOMs.

What's the failure rate / probability of core failure on sun4v?

What are your experiences with the sun4v systems?

Do you avoid using LDOM for this or for any other reason?

Is a system with LDOMs inherently less reliable than one without, esp. since all guest LDOMs depend on the primary.

If each LDOM is given at least 2 cores each, then does that mitigate the total loss of the LDOM if one core is lost?

Thanks in advance for your help.
# 2  
Old 08-29-2013
I use this exact configuration. LDOMS with zones installed in the LDOMS. it really comes down to money and complexity. Money in the sense you can use your LDOM configs to limit your exposure to licensing by physical resource limitations in the LDOM config (you can't do this with zones alone) and complexity in that it's essentially a double VM, or a VM running in a VM and all the complexity that brings add mounted storage from a SAN and you can see where it gets complicated very fast.
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# 3  
Old 08-30-2013
I would just like to correct os2mac, that zones can indeed be used as physical resource limitation.
As per document :

If you use resource pool with processor sets attached to specified zones, Oracle recognizes it as hard partition for software licensing.

As for LDOM and high availability you can use migrate option and/or import the ldom configuration on another server manually (this will require FC or ISCSI disk for root available to multiple nodes).

Other option is to have, for instance, two LDOM on local disks with zone inside on FC/ISCSI disk.
If one host goes down, you can always attach and boot the zone(s) on another LDOM (node).
Since zone fc zpool now will warn you that the zone/zpool is active on another node(LDOM), you will not be able to accidentally attach the zone on both LDOM as the same time.

And of course you can always buy Solaris cluster which will do above things for you with HA agents (but that's rather expensive).

Hope that helps

This User Gave Thanks to Peasant For This Post:
# 4  
Old 08-30-2013
Enterprise Management Operations Center can also help with uptime by monitoring ldoms and restarting them as needed on another host.
This User Gave Thanks to DustinT For This Post:
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