Hey there,
i have installed 4 disks with 18 TB of capacity. 16,37TiB as usable space per disk. 4 x 16,37 = 65,48 TiB minus one disk for parity should come out to 49,11 TiB.
My storage tab only showes me a usable cpacity of 43.48 TiB. Somehow 5,63 TiB are missing and I miss them dearly… =)
Could anybody help me with understanding the problem I have and maybe help me to recover the missing space?
Thanks in advance,
chuck
Probably due to ZFS overhead. The ZFS Capacity Calculator is a good resource.
Are you sure all your drives are 18TB? 43.48TB is suspiciously close to what you would get with 16TB drives (even one 16TB drive among 18TB can give this result).
Thx for your reply… I am positive that they all are 18TB…
I am wondering if the problem is sitting infront of the nas or if it is internal? =)
Thx for the info!
Was the pool expanded before?
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I recently moved from a Sonology nas to Truenas. I set up truenas (first install nothing imported) with 3x18TB to begin with a couple of days ago and the storage space shown was alright. Then I copied all the data from a single 18TB disk to the Truenas pool. After that was done I expanded the 3x18 pool with the fourth 18TB disk. Right now the result is 43,487TB (should be 49,11TB). All disks are the same make and model number.
That solves the mystery, see 24.10 RC2 Raidz expansion caused miscalculated available storage
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Seems like this is the reason for the size discrepancy. In short, you actually have your space, but the reporting is wrong.
There is an entire tag on this forum for the issue. You should give it a read. Perhaps this thread is the most comprehensive.
Thanhk you J_B and swc_phil!
Will read this and hope that this will solve my problem…
Cheers
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This will only “solve” the issue in that you know why reports are wrong, but there’s no way to fix it other than by destroying the pool.
As pictured here:
Thx for the laugh with the link!
This is really uncool that Truenas (ZFS) can´t get one of the most important things, the capacity of the pool right when you expand. It is really unsatisfying… Read the thread 24.10 RC2… and that felt like a kick in the gut. Just started finding my way into Truenas and really enjoy it so far. But seemingly I need to rethink my setup here. Guess destroy and rebuild ist the way to go then. But that means that I have to buy some larger disks and sell off my smaller ones. Not what I wanted to do, but I want to get rid of 2x918+, 620slim, 215j and 113j. Its going to be a larger and more cost intensive project then anticipated. At least its going to be fun in the end =)