surreal pollen
IHAC with a new FAS 2820 with 12 x 10TB drives
looking at default fusion output is seems we loose a massive amount of storage to Raid-Tec and Hot Spare.
Eg. 120TB RAW, 63TB Usable.
Can we do ADP R-D-D on a FAS (We will be running 9.15.1 ?) it looks like fusion is defaulting to R-D ?
analog totem
Can you show what fusion recommends regarding the aggregates?
surreal pollen
it shows just 1 aggregate.. of 63.5TB usable
zinc gull
You cannot do ADPv2 on FAS (and you certainly don't want to, as it would slow down the system to a crawl)
Note that Fusion shows the raw capacity in TB (base 10) but the usable capacity in TiB (base 2) Those 120 TB are more like 110 TiB so you get around 60% which sounds about right to me for RAID-TEC
unique sun
You sure about that @zinc gull ?
I know the raw and the usable capacities in fusion are both TiB. Figured they would do the same with effective
Also all numbers in ONTAP are actually TiB. It is documented some place. It was a bug so long ago and it is all over the code that it’s impossible to fix. Every time ONTAP says TB( or GB or KB or MB) there should be an “i” in there (TiB/MiB/KiB etc)
zinc gull
The screenshot seems to agree
the 120TB is definitely marketing capacity (12 x 10TB), and the math seems to check out (10TB is 9.1TiB, times 8 data disks is 72 TiB, take away the 10% WAFL reserve you arrive at 65 TiB, minus the root aggregates gets you very close to what Fusion reports)
I think some time ago they went through all the numbers in Fusion and made sure that the "TB" or "TiB" text matches what is actually displayed, because there was so much "con-Fusion" (sorry for the pun 🙈 )
crystal pivot
Not sure though why Fusion does not show 5% WAFL Reserve since that what you would actually get with an SATA aggr >30TIB with ONTAP 9.14.1+
If I remember correctly that actually worked in Fusion, looks like it's bugged now. Tried it with different FAS models, always shows 10% reserve...
unique sun
We all know fusion is a synonym for “full of bugs “
My favorite is when an aff doesn’t do or doesn’t allow you to do adp on all the disks, even manually
crystal pivot
hm... looks like it's only bugged for FAS, with AFF it works: if you change it to 9.11.1 you get 10%, change it to 9.15.1 it's 5%
crystal pivot
My favorite is when an aff doesn’t do or doesn’t allow you to do adp on all the ...
yeah... also PITA when Fusion does not allow you to modify MCC-IP disk count