Over disk Raid10 claim

Hello chenchen,

The best way for us to tell is to look at a phone home log of your system so that we can see how much space is used and how much is left free on the different tiers.  In most cases I would say you should be ok if you were to have a >2TB write but will need to look at a phone home log to be sure that you could handle a >2tb write and not put your system into emergency mode.

Please let us know if you have any other questions.

Hi 

Thanks for the answer.

I will rephrase my issue\question:

It's not related to R10 or R5, it's the general approach of how SC works, i guess.

In our VNX system (or any other SAN) - a volume\LUN has a strict capacity of x TB.(2TB for example) and That's also what the hypervisor sees (ESXI for example). That's it. 

Once the capacity is near to full (1.9TB) - that any operation that requires more that 0.1TB - will fail and rollback by the hypervisor (storage vmotion for example).

In SC - as i can learn, the logical capacity is actually not something we can trust of - because it depends on the physical disks space (R10\R5) .

Such thing - actually puts me in risk 24\7. Why? because if there in a bulk writes of 5TB in the middle of the night (R10 in most cases - unless i have used R5 first on the storage profile) - and the volume has 50% free space (which is NOT true, because what matters is the disks) - the whole system - without any warning - will enter into emergency mode !

I can and i have created Snapshot every hour, but the bulk can happen between the snapshots.

Is SC will give me sleepless nights from now on?

What to i miss or wrong?