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October 11th, 2012 07:00
Question re:FAST
Hello,
Have a couple of questions I am trying to find answers to regarding FAST:
1. The devices that are defined in a Storage Group - are these existing devices that are in production, and the ones that you would like FAST to monitor and act on? Just wanted to confirm.
2. For chargebacks, I believe it is recommended that the aggregate tier for all tiers be at 100%. How does it make a difference if it is over 100%? Say for 3 tiers, I have 50%, 50% and 50%. How does it make difficult to calculate chargeback?
Thanks
Prasad
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RobertDudley
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448 Posts
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October 11th, 2012 12:00
The best method I have heard for charge back is to calculate the blended cost of EFD/FC/SATA and provide that. I cant take credit for this Rob from Verisign came up with this idea.
If you want a specific cost then you will have to calculate that each time based on what data is in which location. If you open each storage group you can find how much of each device is in what tier. Remember with FAST/VP that changes all the time.
mdani1
56 Posts
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October 11th, 2012 12:00
Hi Prasad,
You generally associate the SG to the FAST policy and this SG has the luns in it which is part of a masking view so definetly they are assigned to host. You can add non masked SG also to the FAST but that wont do anything untill host dont write on it. So your first query is Yes and you can have cascaded SG's if on same host your looking for mixing some devices into FASt and isolate some devices on code 5876. For the chargeback I think robert gave a good idea. If you use a average cost per GB and mix it with you policy type then its makes more beneficial. For example if I have 3 different policies . I will first find the average cost per GB of disk and then as per policy I will try to generalize a cost and make chargeback model.As when your using FAST and have data sitting on multiple tiers you cant have exact charging model rather go for such mix model.
Regards,
Mrinal Dani
PrasadCS
6 Posts
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October 11th, 2012 14:00
Thanks Robert & Mrinal. Your inputs were very helpful in clarifying things.
Prasad.
gblack2
50 Posts
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October 12th, 2012 11:00
We are also charging back on the blended rate with our FASTVP.