I first want to start off saying that I appreciate all the hard work that has gone into maintaining this great piece of software! I have been using FreeNAS for over a year now and it has been working awesome.
The past couple weeks i have been copying the data off of my 12 disk array composed of 2 (6 raidz2) arrays because i wanted to create one raidz2 with 10 disks. This will allow me to eventually fully fill my SuperMicro 24 bay chassis with two raidz2 arrays composed of 10 disks and one raidz2 array composed of 4 disks.
When creating a 10 disk raidz2 array the usable space does not add up. A 10 raidz2 array with 4TB disk yields and estimated capacity of 29.09 TB but once the volume is created the available space is only 27.2TB. Where did the 1.84 TB go? I am using an optimal configuration according to the users manual. I have tried this on 9.1.1 Release and 9.2.1.3 Release and get the same results. Whats interesting is when i create a 6 disk raidz2 volume the estimated and available space match.
The specs of my system are:
SuperMicro H8DME-2 motherboard
SuperMicro SuperChassis 846TQ-R900B
32GB of ECC Ram
2 x Six-Core AMD Opteron(tm) Processor 2419 (12 Cores Total)
3 x AOC-SAT2-MV8 Controller Cards
10 x 4TB Seagate Hard Drives
was tested on 9.1.1 and 9.2.1.3 x64 bit booting for USB
The past couple weeks i have been copying the data off of my 12 disk array composed of 2 (6 raidz2) arrays because i wanted to create one raidz2 with 10 disks. This will allow me to eventually fully fill my SuperMicro 24 bay chassis with two raidz2 arrays composed of 10 disks and one raidz2 array composed of 4 disks.
When creating a 10 disk raidz2 array the usable space does not add up. A 10 raidz2 array with 4TB disk yields and estimated capacity of 29.09 TB but once the volume is created the available space is only 27.2TB. Where did the 1.84 TB go? I am using an optimal configuration according to the users manual. I have tried this on 9.1.1 Release and 9.2.1.3 Release and get the same results. Whats interesting is when i create a 6 disk raidz2 volume the estimated and available space match.
The specs of my system are:
SuperMicro H8DME-2 motherboard
SuperMicro SuperChassis 846TQ-R900B
32GB of ECC Ram
2 x Six-Core AMD Opteron(tm) Processor 2419 (12 Cores Total)
3 x AOC-SAT2-MV8 Controller Cards
10 x 4TB Seagate Hard Drives
was tested on 9.1.1 and 9.2.1.3 x64 bit booting for USB