So my boss gives me the task to produce some info on the disk space we have in our DS2246 and our DS4246 devices since they have been around a while and things need reviewing. So I jump into OnCommand and start looking around.
I am confused with what Storage -> Aggregates is showing me. It reports Total Space 13.24 TB with a 22 Disk Count.
I have 24 disk at 900 GB SAS each with 12 in rg0 and 12 in rg1. Loss two as spares. I also have the 2 parity and 2 dparity 1 each in rg0 and rg1. So I get the 22 disk if we include the parity disk, which matches the above Disk Count of 22. But the Total Space is throwing me. Shouldn't it be around 18 TB or so minus the overhead for various reasons. Even 17.xx TB or 16.XX TB, but 13.24.
The three volumes on this aggr0 are 714.14GB, 3 TB, and 8 TB yields 11.714 TB, but the Storage -> Aggregates value for Used Space is 10.02 TB.
Then if I look at Storage -> Disks and the values for Effective Size I get even more unsure. 836.91 GB x 22 = 18.412 TB and remove the parity disk for actual space for data the results would be 836.91 x 18 = 15.064 TB which is not even near 11.714 or 10.02 though I can understand if this ... sort of.
And in lite of the fact that I am using RAID-DP i was expecting a "half-the-space" value somewhere since I thought rg0 was RAIDing its contents to rg1.
Is it better to use "df" at the command line to get the info I am looking for?
Thank you all for your input and kindness to your more confused and spacially challenged members. 🙂