Size of data store for just an OS LUN?

This seems to be a silly question for me, but the alarm is shake me up.

If I want to create a data store that is just a LUN for an OS only, what size does?

For example, in the construction of a Windows Server 2008 R2 machine, I created a LUN on the SAN for just the OS and set it to 50GB.  Then, in vCenter, I add the storage to the ESXi hosts as a data store (lets call it OSLUN).  Then I create a virtual computer and use OSLUN as the hard drive, 40 GB provisioning (think that is all I need).  Now, because I chose 8 GB of RAM, the total of the VMDK ends up being 48Go.  vCenter launches an alert to 'Use of data to drive store' saying 49,75 GB it remains only 1.24 GB.

It makes any sense to me, except the alarm that makes me think I'm somehow running out of space to store data... should I just ignore this alarm?  I do not see how I'd go on the space allocated for the LUN of the OS.  :\

Unless you were to store these things on different sets of pins he won't have too much difference. Keep your environment as simple as long as you can. Adding to the complexity when it solves a specific problem not only because you can.

Tags: VMware

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