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Can I completely separate 2 storage areas in the same EVA4400?

Posted on 2010-08-12
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Last Modified: 2013-11-14
Hi,

We are going to procure 2 EVA4400, we have 2 Data Centers, so 1 for each Data Center, and connected between them through a FC switch to get replication, business continuity and so.

We have 2 Departaments and I would like to know if it´s possible to separate the storage area of both departaments, but sharing the same pair of EVA4400. One department is asking me for P2000 for their systems (exchange,data server...) and the other department is asking me for EVA4400 for their systems (corporate applications,...)....so I am wondering whether we could use the same pair of EVA4400 (active and standby), but differentiating the physical storage blocks, so every department would have their own physical storage area.

I guess the only issue to bear in mind is the growing needs of every department...since EVA4400 limit is 96 TB, isn´t it? Or when the time came, we could buy other 2 new EVA4400.

Thank you
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Question by:asanchgo
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by:andyalder
ID: 33422829
For efficiency it's advised to have just one storage group and create multiple LUNs on it, but there's no reason not to have two seperate disk groups on each EVA, you'll lose twice the capacity for distributed hot spares as sparing is per-group.

An EVA4400 can be upgraded to EVA4600 or EVA4800 to allow for more disks by changing the controllers, it's quite a job though. I hesitate to say 96TB max capacity as that would involve using slow FATA disks which is a bit of a waste of an EVA.
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by:asanchgo
ID: 33423097
Thank you andyalder, but since I am new at storage systems, I have more questions after reading your comments:

-Two disk groups means two physical separate storage area in the same device?
- What is a LUN? LUN means that no separation of physical storage would exist?
- What is a distributed hot spare?
- 96TB implies using FATA then, right? what other disk are available with EVA4400? By your words I supposed they have less capacity than FATA disks.
- Is maybe the point that there is no reason why we should separate physical storage of both departments?

Thanks. And sorry for the language, some terms are difficult to me in English.
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andyalder earned 125 total points
ID: 33423331
What you do with an EVA (and many other makes) is to create one array with all the disks in it, then divide this into several LUNs.

LUNs are logical disks that you present to hosts so if you had 8 * 600GB disks in your SAN you'd put all 8 in one group and then create several LUNs and present one to the Exchange server to put itsdata on, one LUN to SQL server for its data etc.

A hot spare is an online spare disk that replaces any disk that fails rather than wait for you to realise it's failed and swap it out. For the EVA these spare disks are virtual disks made from taking a bit of capacity from each disk you put in the box. Say you had 8 * 600GB disks, it would reserve 100GB from each giving 700GB spare space (not sooGB since I'm assuming a disk has just failed so only 7 left). That 700GB is enough to replace the failed drive.

FATA disks are slow SATA disks with a fibre channel interface on them so they can be plugged into an EVA, normally you use 15K disks in a SAN for speed and they max out at 600GB.

I don't see the need for physical seperation of data for each department, normally one would just create the logical disks for them as and when needed and maybe bill them per terabyte.

Are you sure you need a SAN? What are you intending to store on it? Maybe you need a NAS box instead.
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Author Closing Comment

by:asanchgo
ID: 33423802
Simply a perfect answer. Thanks.

We need a SAN, a NAS is not enough since we are using several database servers, 2 data centers and different systems: oracle, business objects, exchange server, personal files, corporate files...
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