Hi Folks,

Please could you help me size the storage capacity requirements. The client has initial requirement of 35 TB and period of investment is for 3 years. The Year on Year growth is predicated at 40 %.He would want 4 daily and 2 monthly snapshots and the daily rate of change is 30 % and monthly is 80 %. Could you help me come with the storage space required. The environment just has oracle databases.

Regards

varghese

Abraham -

I'm not sure where Nadav's info came from, as you provide no such breakdown into individual databases and the initial total only comes up to 24.1 TB, not 35 TB as you stated.

Taken at face value, it seems to me like your

initialfootprint would have to be:35 TB for databases

+ 42 TB for daily snapshots (4 x 0.3 x 35 TB)

+ 56 TB for monthly snapshots (2 x 0.8 x 35 TB)

= 133 TB total

Allowing for 3 years' growth at 40% per year, that becomes:

133 TB at initial install

186 TB at end of year 1 (133 TB x 1.4)

260 TB at end of year 2 (186 TB x 1.4)

365 TB at end of year 3 (260 TB x 1.4)

At this point I usually factor in the best practice of keeping the array below 90% allocation, so that would be 365 TB / 0.9 = 406 TB usable.

If you also want to assume compression of the data, say 2X as Navad indicated, then your requirement would be 406 TB / 2 =

203 TBusable. I say 'if' here because not all customers like making that kind of assumption, but our InfoSight data actually indicates the average compression ratio for Oracle databases is more like 2.5X. So 2X reduction is pretty reasonable.By the way, I don't see how you can have a 30% daily change rate but only 80% change rate per month. Not saying you're wrong, it just seems counterintuitive to me. You might want to double-check those numbers with your customer.

I realize this is cocktail-napkin math - and it doesn't address the more important issues of controller selection and cache sizing - but hopefully something here is helpful.