EqualLogic PS5000 - how many LUNS

We just bought a Dell Equallogic PS5000 to connect to our virtual machine environment.  We will connect only ESX host (3 of them) to the Equallogic.  The guest VM will use local storage to ESX, but all virtual machines running on the hosts will get their memory by the Equallogic.

The question is: how many LUNs we set up on the PS5000?  What determines how many LUNS are necessary?

Thanks for any information.

"tuck,

> We need to have an another LUN for snapshots of server (equallogic)?

N ° when you create a volume on your Equallogic SAN, it will default again reserve the same amount of space for the snapshots. At any time, you can increase or decrease this placeholder. If you use this placeholder the default action is to delete the oldest snapshot.

> Can initially set you 1 LUN with a limited amount of space (say 1.5 to) then expand out more later if necessary and add additional LUNS required?

Yes, but you can't do that. Yes, you can create a volume of 1.5 TB and later it increases the size, but it is the new size will be automatically recognized by the operating system. I do not think hand VMFS (VMware f system Island) will stretch to see increased at all space, so your option here is to create a second volume with the point and creating a large volume. The downside of this is that something happened to one of the targets in a store of data scopes ALL data are lost. I agree that extended are bad - they placed there, and there, they must be kept.

However, lets say, you know that in the future a specific target (LUN) must be bigger, but because you have only 7 TB of space you can not afford to provide it is all he needs. For example a fileshare, you know over time people are just going to store more and more, it's where you could introduce a large volume, say 2 TB, but it would only consume as much space as the data required stored summer, as more data is written more space is necessary. This is called a provisioning, this is a double-edged sword. If you have too use a provisioning by presenting each volume as finely put into service and so this 70 TB of storage of your 7TB dashboard, what you can do, but if you neglect to submit buy a req to buy and additional storage beyond the gates 7TB before starting the people write about it, you will cause yourself some pain as the operating systems do not like been said they can not write no more!

Do take a step back and figure out your available LUN, but have no more thing, with Storage VMotion, you can always move VMs. I would advise against the creation of a LARGE volume and stick all your virtual machines on it, rather I would stick with volumes ~ 500GB and spread them out. Don't let some soft space by volume for the use of snapshots of the virtual computer.

> Are affected LUNS based on some hard disks, storage or both?

It is not clear to me what is your question here, please provide details, but to confuse the Equallogic issue tables do not have LUNs, but presents goals, but I think that your point of view it is not a difference.

You may want to get a copy of http://www.amazon.com/VMware-Infrastructure-Advanced-Technical-Operations/dp/0971151083

Regarding the RAID configuration, if you feel that you are wrong, you can always change it without data loss, you can set per LUN or let it default to what you choose for the entire table.

Good luck.

Tags: VMware

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