Adding additional Hard Drives to existing RAID

Say I have 4 SAS hard drives on RAID 10 on LSI MegaRAID SATA/SAS 9260-8i 6Gb/s.
Down the road, I run out of HD space; therefore I need allocate more space to existing VMs.
Is it possible to add two more hard drives to existing RAID 10 array without loosing the contents of the hard drives?
After adding 2 hard drives, I would have total 6 hard drives in RAID 10.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It is possible if your LSI storage controller supports the expansion of the RAID Array, Logical Volume, Drive or virtual disk, or whatever they call it.

The rebuild time, can take several days to complete, and during this type the existing hard drives are put under serious workload, which could cause them to fail, during this time performance of the datastore would be poor.

RAID expansion feature is a feature of HP Smart Start controllers, with the additional Battery Backup Write Cache module.

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sgleeAuthor Commented:
"The rebuild time, can take several days to complete, ... put under serious workload, "  ---> If this is the case, I would rather backup VMs and add & reinitialize new hard drives and restore those VMs from the backup. Provided that VMs are backed up daily, it would only take several hours to restore VMs from the backup device.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
That is the solution which most experts do!
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