Disk Storage Increase

Hello, I need to add more disk space to File server, The file server is a VM on Hyper-V host, Hyper-V host has 2TB X 4 HDD's with RAID 1, so we get 2TB for system backup and 2TB for our system which has Hyper-V host and two VM's a DC1 and File Server, can someone please help me how can i increase my Disk space to have more than 10TB of usable disk space.
Yasir ArfatJunior System AdministratorAsked:
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Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
What server do you have ?

 if you have an HPE server, you can expand arrays and logical disks, by inserting new additional disks if you have the correct Smart Array controller.

So what server do you have, and do you have additional slots to insert additional disks ?

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Yasir ArfatJunior System AdministratorAuthor Commented:
Thanks for reply I have Lenovo thinkserver RD450 i have 4 empty slots
Yasir ArfatJunior System AdministratorAuthor Commented:
Can i just add 2 more HDD's to empty bays and they will automatically become part of RAID 1 ?  or should i implement RAID 5 but if i have to implement RAID 5 how can insure that I don't lose any data.
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Taras ShvedStorage EngineerCommented:
Your option is to get another 4 x 2TB drives so you have 8 x 2TB drives in total which gives you 16TB raw capacity. In order to get 10TB of usable storage (after RAID) you have to go with parity RAIDs (RAID5 or RAID6).

With RAID5 you will get around 14TB usable, with RAID6 you will have around 12TB. Since it's your hypervisor that runs virtualization workloads the performance of single spindle drive (RAID5/RAID6) might be not enough, thus I would recommend you to build a RAID50 array (two RAID5 groups 4 drives each striped with RAID0 on top). It's a good compromise between redundancy and performance (actually you will get a doubled performance compared to your current RAID1 setup).
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
I would not recommend RAID5, it's not considered appropriate for enterprise computing, due t only supporting a single drive failure.
Yasir ArfatJunior System AdministratorAuthor Commented:
Thanks for replying guys Raid 6 is the way to go but can't afford to lose my VM machines and data so I am thinking if I add Synalogy NAS and use windows server's 2012 r2 iSCSI target option so that's how I can increase the disk space I guess please advise
Andrew Hancock (VMware vExpert / EE Fellow)VMware and Virtualization ConsultantCommented:
Do you still need further help with this question ?
Yasir ArfatJunior System AdministratorAuthor Commented:
No I have got NAS storage implemented thanks
Yasir ArfatJunior System AdministratorAuthor Commented:
I got Synology NAS disk station using it as iSCSI target which gives us around 12 TB with RAID 6
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