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тАО02-03-2011 08:57 AM
тАО02-03-2011 08:57 AM
I am looking to deploy a 14.4TB P4500 virtualization solution to virtualize a load of servers on our network. This comes with two nodes.
I am going on the course soon but I am interested to know what the best practice is for storing VMs and data on these systems. For example, with physical servers for Exchange I would use RAID 1 for OS and logs and RAID5 for data. How does this translate to the P4500? Is the whole thing set up as a massive RAID5 and then the raid1 drives I need then are "virtual" raid1 sitting on raid5?
I am interested in using network raid in case one of the nodes fails completely. Is this a good idea or are they so redundant that it would be a waste of space?
I am in an SME with and I am looking to have approx 12 VMs running on this setup.
Thanks
Solved! Go to Solution.
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тАО02-03-2011 04:10 PM
тАО02-03-2011 04:10 PM
Re: P4500 Basic Storage Config
1 array, 1 logical drive: RAID5
2 arrays, 1 logical drive each: each RAID5
This is changable via the Lefthand CMC. Probably not something you want to change though.
Each node has physical storage that gets added to the cluster. From the cluster, you can configure various volumes with different settings. Most notably, Network RAID.
If you are goign to use Network RAID, keep in mind that you have up to half you available storage for a single volume (or set of volumes) since you are basically mirroring your data (in a 2 node configuration).
Since you are using virtualization, the virtual machines don't really care about RAID level.. they can't even see it. You simply present a volume to your virtual host, then carve up space out of it to create your virtual machines.
Which technology are you using...VMware? Hyper-V? Zen?
Without network raid... the boxes are not redundant to each other. They simply act as a pool of storage.
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)
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тАО02-03-2011 04:53 PM
тАО02-03-2011 04:53 PM
SolutionIf you choose Network RAID 0, you will LOOSE access to your storage if a single storage nodes goes down (reboot, failure, software patching or any other reason). So if high availability, and the luxury to perform maintenance on your storage nodes without taking your VMs offline is of importance, then stick with Network RAID 10.
Like the previous posted noted you will consume twice the storage cluster capacity.
Here is a capacity calculator that you can use to show your usable storage based on different replication scenarios:
http://www.tdonline.com/hp-lefthand/storage-calculator/
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тАО02-04-2011 01:33 AM
тАО02-04-2011 01:33 AM
Re: P4500 Basic Storage Config
Thanks
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тАО02-04-2011 03:04 AM
тАО02-04-2011 03:04 AM
Re: P4500 Basic Storage Config
Concur with Teledata on the 'stick with the RAID5 on the nodes themselves and go with Network RAID 2 (mirroring) for protection against node failure' advice. This is what our consultant from HP UK went with for our install.
Because you've got the higher spindle count and multiple controllers, it sort of negates not having dedicated RAID 10's for your Logs like you would in direct attached storage.
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тАО02-04-2011 03:44 AM
тАО02-04-2011 03:44 AM
Re: P4500 Basic Storage Config
For exchnage/SQL is it still recommended to create 3 volumes (OS, Logs, Data) even though they will actually just be all in the same place?
Thanks
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тАО02-04-2011 03:46 AM
тАО02-04-2011 03:46 AM
Re: P4500 Basic Storage Config
If somebody accidently remove one volume or a file system becomes corrupted you still have a chance to recover the database without much loss of data.
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тАО02-04-2011 03:50 AM
тАО02-04-2011 03:50 AM
Re: P4500 Basic Storage Config
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тАО02-05-2011 07:23 AM
тАО02-05-2011 07:23 AM