Hi all, I'm struggling to understand some Ceph usage statistics and I was hoping someone might be able to explain them to me.
If I run 'rados df' I get the following: # rados df pool name category KB objects clones degraded unfound rd rd KB wr wr KB pool-1 - 0 0 0 0 0 0 0 0 0 pool-2 - 2339809 1299 0 0 0 300 540600 3301 2340798 pool-3 - 4095749 14654 0 0 0 3969 17256 3337952 70296734 pool-4 - 1802832 39332 0 0 0 0 0 2205979 0 pool-5 - 193102485 82397 0 0 0 668938 102410614 5230404 254457331 total used 5402116076 137682 total avail 854277445084 total space 859679561160 Pools 2 and 4 have a size of 2, whilst pools 3 and 5 have a size of 3. 'ceph status' tells me the following stats: "192 GB data, 134 kobjects, 5151 GB used, 795 TB / 800 TB avail" The 192 GB of data is equal to the sum of the 'KB' column of the rados df data. The used and available numbers are the same the totals given by rados df. What I don't understand is how we have used 5,151 GB of data. Given the sizes of each pool I would expect it to be closer to 572 GB (sum of the size of each pool multiplied by pool 'size') plus some overhead of some kind. This is a factor of 9 different. So my question is: what have I missed? Cheers, George Ryall Scientific Computing | STFC Rutherford Appleton Laboratory | Harwell Oxford | Didcot | OX11 0QX (01235 44) 5021 -- Scanned by iCritical.
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