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June 26th, 2013 04:00
Best practice for VNX Unified storage
So, we have got a new VNX Unified storage system upgrade.
I'm very familiar with AVM, and how we used to design for that.
To recap, for example, for FC disk, for each raid group we create two luns, one to each SP.
Then, give both LUN to the NAS.
Now, with Unified, the block portion can run on storage pool.
I've gone through the new NAS 7.1 Filesystem management with AVM document, and it mentions that, if we want to use the AVM, then provision in the way the AVM will use it; e.g. provision storage LUNs, in pairs, balanced between the SPs.
What it doesn't mention, is
1) Raid group approach better, or Storage pool?
2) Recommended size of the LUN to create in the pool?
Thanks,
Kelvin
Rainer_EMC
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June 26th, 2013 05:00
It is always a tradeoff between functionality, flexibility and performance
Classic raidgroups can get you the highest performance
There difference isn’t that big though – you might not notice it depending on your workload
Using pool based LUNs (thick for file) you get better flexibility in terms of sharing with SAN usage and features like FAST VP
If you do use pool based LUNs look at the VNX best practices for performance – there are guidelines there on how many LUNs to create and what size
I believe the wizard will also create them according to the BPP