Ineed to adddisk spaceto myFAS2020.At the moment it onlyhas base shelfwith12x500GB SATAHDDs. I am usingactive-active controllerand I have twoaggregates.I'mthinking ofashelfwith12x1TB SATAHDD.Can I extendmy twoaggregatesofthese discs?Or should Ichoosehomogeneous HDDs (so 500 GB HDDs)?In termsof performance, sinceincreasingthe mechanics,I shouldimprove,right?
How much spacedo I getnet profitof 12TBRAWadded to thisSAN?
Well if you are trying to add disks of 500GB aggregate to 1TB aggregate then 1 TB will be downsized to 500GB each. Only then you will be able to add them in 1 TB aggregates on each controller.
However, if space is a concern for you, you need to create a new Aggregate. However since you will only be buying 1 shelf of 12X1TB SATA drives I would recommend to add them to only 1 controller with 1 Aggregate. That will be ideal for performance/space configuration.
I take advantageofyour willingness, I was toldI might havea newFAS2020with a similaramount of RAW disk spaceofthe shelfat the same price.Do you think it's better to havetworather thanonly oneFAS2020with theshelfadd-on or not?CurrentlyI'musingiSCSIinVMware andinCIFSfile sharing.At the moment I do not need to dodisaster recovery.
Personally I'd opt for 500GB disks - if they are still available. You can then expand each of your existing aggregates, and your performance should improve, as there will be more active spindles (you may consider running reallocate for existing volumes to spread them across all available spindles).
With 1TB disks you should ideally create a new aggregate - if you try to add them to existing ones, each drive will be downsized to 500GB.
BTW - you can connect only DS14 shelves to FAS2020, each holding 14 disks.
You will get around 7TB usable from 12x 1TB aggregate (2 drives left as hot spares).