Hi All,
Bit of an issue here - i'm trying to add a disk to a single host, HP DL380p Gen 8 server running ESXI 5.5.0 (HP Image update 2) with a P420i controller (6 600GB disks in RAID6)
I've added the disk to the existing array ok so there are now 7 600GB drives - ESXI sees the updated capacity under the storage view (previous capacity was 2TB)
however under the datastore storage view
Under the datastore properties i can see the capacity increase however i cannot increase the actual datastore
Am i missing anything?
Regards
James Bell
Accepted Solutions
Hi there James and welcome to the forums.
Unfortunately you are not going to like my answer but lets proceed anyway 
If you look at your second screenshot you will notice that there is another partition on this "device" - a 4GB FAT32 partition. This will have meant when you created the VMFS5 datastore on this device you would have been asked a question about whether to "Use Free Space" or "Use all available partitions". It would be my guess that the choice was "Use Free Space". What this meant was the existing partition format would have been kept which due to the FAT32 partition was MBR.
When the VMFS5 datastore was created it couldn't convert the partition format of the device to GPT which allows for datastores greater than 2TB in size and is why you cannot currently expand it use the additional space.
Solution: Move all VMs from this datastore, then delete the datastore and recreate ensuring the option to "Use all available partitions" is selected. Once completed, migrate VMs back.
NOTE: This step is destructive so make sure you have all VMs off the datastore and anything else stored there before proceeding. That includes VMs which might have been removed from inventory or ISOs stored there.
Hope this helps,
ThompsG
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Hi there James and welcome to the forums.
Unfortunately you are not going to like my answer but lets proceed anyway
If you look at your second screenshot you will notice that there is another partition on this "device" - a 4GB FAT32 partition. This will have meant when you created the VMFS5 datastore on this device you would have been asked a question about whether to "Use Free Space" or "Use all available partitions". It would be my guess that the choice was "Use Free Space". What this meant was the existing partition format would have been kept which due to the FAT32 partition was MBR.
When the VMFS5 datastore was created it couldn't convert the partition format of the device to GPT which allows for datastores greater than 2TB in size and is why you cannot currently expand it use the additional space.
Solution: Move all VMs from this datastore, then delete the datastore and recreate ensuring the option to "Use all available partitions" is selected. Once completed, migrate VMs back.
NOTE: This step is destructive so make sure you have all VMs off the datastore and anything else stored there before proceeding. That includes VMs which might have been removed from inventory or ISOs stored there.
Hope this helps,
ThompsG
Hi James,
I'm afraid you cannot add another datastore to the existing device. Best way to tackle it is to start fresh even though it appears to be the longest path - the device really needs to be converted to GPT to support beyond 2TB and that will require the steps I listed before 
Make sure you have backups, good backups and a confirmed recovery plan before starting.
Kind regards.