How can you tell if there is a RAID on a VMware host with local storage

I have a VMware ESXi 5.1.0 host which uses local storage as datastore (2.45 TB). This server is an old server and it has 6 900 GB hard drives. The drive type is non-SSD and the Type is VMFS5. How can I tell what kind of RAID this has? Can I add drives to it (it has 2 open slots)?
Claude ConstantinescuAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Boot the server, and at the start select the Storage Controller, and check what the VD are configured as.
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Mr TorturSystem EngineerCommented:
Hi,
which is the server model please?
For HP servers for example you can reboot and press F8 key when asked to enter into RAID utility (ACU or something like that).
For Dell you can install - maybe already done..? - OMSA, Open Manage Server administrator.
For both or others servers type yu can use iDrac, iLo, IMM, etc.. mgmt interface but maybe you won't have the info you look for depending on server manufacturer.

If it is in production and without RAID there is someone who made a big mistake in the past...

Theorically you can add drives in the empty slots, but depending on existing RAID configuration you could merge it into a logical drive or not, or have to create a new logical drive. And in vmware esxi you could make an extent on existing datastore, but I don't recommend it and I don't think it is recommended, or create a new logical volume and datastore with only these 2 new physical drives.
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Claude ConstantinescuAuthor Commented:
Dell PowerEdge T420
I'm assuming there is a RAID since the numbers don't add up, 2.45 TB total disk space but I have 6 drives of 900 GB each which would add up to 5.4 TB so it looks like mirror
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Claude ConstantinescuAuthor Commented:
I found out that is RAID 10. One drive failed, so I replaced it, however the system did not come up, this is what's on screen, what do I do?

Thanks
BIOS screen
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
is the disk showing as missing the one you have removed ?

and disk 00:01:03 is the one inserted ?

if you add that new disk as a hot spare it will start to rebuild.
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Claude ConstantinescuAuthor Commented:
Yes, I inserted it in the same slot, I thought it would automatically do it
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