netapp storage

I have a dual controller  netapp storage. Actually it is rebranded netapp bought from IBM - N6040. There are two disk enclosures connected to storage, one to the first controller and second enclosure to second controller. Disk enclosures are fible channel with 14 FC disk 15rpm. I created one aggregate for all disks in firts enclosure and one aggregate for all disks in second enclosures.
I am going to buy new enclosure with 14FC 15rpm disks. I was wondering how to configure it. To create new aggregate with disk for all disks in new enclosures or to add all disk to the current aggregate. Also how many enclosures is good to be  added  to the storage?  I already read the specification, so maybe something from your experience.
I was told that it's better to buy new storage and not add more than couple disk enclosures. Is this true? Currently I have 10 blade servers connected to this storage through san switches.
dedriAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
We have approx 8 FC shelves connected to our heads, and 8 SATA shelves. We have two aggr for FC and SATA.
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Paul SolovyovskySenior IT AdvisorCommented:
DS14 shelves are end of life so you may not be able to get them directly from Netapp which means that you may only be able get refurbished shelves and drives
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Add all the disks to the same aggreate for maximum performance.

then carve up into volumes for nfs or luns.
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dedriAuthor Commented:
I was told that it's better to buy new storage and not add more than couple disk enclosures. Is this true? What is your opinion?

@paulsolov, we are using EXN4000 enclosures : 4-Gbps Fibre Channel Disk Storage Expansion Unit (MTM 2863-004) with 14 low-profile slots for Fibre Channel disk drives
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Paul SolovyovskySenior IT AdvisorCommented:
Check the HCL to see if these are end of life.  Typically it's best to add storage as you can expand the aggreagte and add raid groups.  What version of Ontap are you running?
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dedriAuthor Commented:
version of Ontap is 7.3.3
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Paul SolovyovskyConnect With a Mentor Senior IT AdvisorCommented:
With 7.3.3 you can only have 15TB aggragtes, with 8.x you can have 64 bit aggregates so you may not be able to extend the aggregate.

good read-up on why to upgrade to 8.x.  Keep in mind that you can't upgrade to 8.x, you would need to create new aggr and migrate
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dedriAuthor Commented:
hanccocka, I am a little bit scary about this configuration. For performance it will be great but in case of failure on couple of drives(actually 3 drives) and everything will be down.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We've never had a single drive fail since 2004, in 16 shelves!
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Paul SolovyovskyConnect With a Mentor Senior IT AdvisorCommented:
There is a spare or two in every aggregate and they rebuild fast with FC drives.
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