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HP p2000 G3 vm storage

Greetings,

I have a p2000 G3 with (8) 450 GB disks. I was thinking of a RAID 50 using 4 disks in one RAID set and the other 4 disks in the other RAID set. I am ordering an extra to use for a spare. When I set it up, since it is one RAID 50 vDisk it is assigned to controller A (it shows automatic but I assume it goes with A for the first vDisk). I will be running a few VMs off of this storage so I thought it would be better to have some on controller A and some on controller B but I don't have the disk space to create (2) RAID 50 vDisks.

Any suggestions on the most efficient set up appreciated.
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rpliner
Asked:
rpliner
2 Solutions
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I usually prefer a single RAID 10 set for all the disks, and some spares. For better write and read performance, and then "cut" the LUNs, and present to the host ESXi/ESX servers.

More Disks = More Spindles = More Performance = More IOPS for your datastores = better performing VMs, but it depends on what VMs you are using, Exchange and SQL usually need more IOPS, that standard VMs, e.g. DCs!
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rplinerAuthor Commented:
thanks hanccocka, as usual. I was considering RAID 10 but when I realized I'd lose about 1 TB of storage, I thought I'd at least inquire about RAID 50. Luckily it's not that big of a deal as this storage was purchased for the sole purpose of moving VMs from other storage and creating a few new ones. It may host Exchange (if I move it), but it will host our doc mgt system index server (it's a beast) and a SQL server, along with a few other servers that aren't as resource consuming.

Based on your response, I should use all 8 disks in the RAID 10, rather than creating (2) RAID 10 sets with 4 disks each. If I did create (2) RAID 10 sets, I could then assign them to different controllers, conceivably for better performance as they will run VMs on different controllers. Does that make sense and if so, is it worth doing or will running all of them on one controller provide the performance I need?

thx
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, you will DOUBLE the IOPS by having all disks in one RAID set.
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andyalderSaggar makers bottom knockerCommented:
LUN ownership on P2000 is per disk group, not per LUN, but 8 disks is a tiny amount for a single controller so it won't matter that the other controller will be idle (apart from providing a mirror for the write cache).
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rplinerAuthor Commented:
OK, I went to provision the RAID 10. Not sure if you are familiar with the p2000 interface, but when I go to create a RAID 10, it gives the option of number of sub vdisks. If I leave at default of 2, I can only provision 2 RAID sets consisting of 2 disks each, forcing the other 4 disks into the spare. If I choose 4 sub vdisks, I can provision 4 RAID sets each containing 2 drives, with no spares. Is that what you meant regarding all 8 disks in the RAID 10 set? I guess they are all "together" in the overall RAID 10 set. It justs looks weird to me. I have attached a screenshot.

thx  Doc1.tiff
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, we are familiar.

Yes, that's what I mean by 8 disks.
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rplinerAuthor Commented:
great. thx
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Paul SolovyovskyCommented:
I've done several of these installs and running RAID5 works fairly well, just make sure you have a hot spare which is critical.  The 450GB disks are SAS I imagine and unless you have specific IOPS requirements RAID5 will suffice in most cases and will give you more available storage.  

Interesting piece to keep in mind is that if you have HP G5, G6, or G7 servers that you will P2V using SFF drives you can re-use them in the P2000 if the form factor is the same.  Just create a new raid group and you're set.
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rplinerAuthor Commented:
paulsolov - thanks for the info. I was originally going to go with either RAID 5 or 50. since, luckily, this storage is strictly for performance, I am going to go with RAID 10. thanks again.

thanks hanccocka as well.
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