I am very new to Freenas, have 9.3 and so far it seems awesome. I will post anything needed so forgive my ignorance if I have not already included something. Below is a screenshot, and I wondered, why is it I have 37.2 TB for my Volume (Datavolume) and only 21.1 TB for my Dataset (Datavolume, guess I should have named it different!)? I have no quotas. Thanks for your time!
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Volume Space Question :)
- Thread starter rob90033
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danb35
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You didn't name that dataset; it's automatically created when you create the pool (i.e., volume), and automatically has the same name as the pool. It's a good idea to create datasets within that main dataset for anything you want to share.
The difference in capacity between the volume itself, and the top-level dataset, is due to parity. The capacity shown for the volume is the total of all your disks--the used amount includes your data and the parity for that data, and the free amount is the remaining space free among all your disks. The capacity shown for your dataset accounts for parity--the "used" amount is just your data, and the "free" amount is the free space minus what's used for parity.
What is your hardware, and what's your pool configuration (how many disks, what size, what RAIDZ configuration)?
The difference in capacity between the volume itself, and the top-level dataset, is due to parity. The capacity shown for the volume is the total of all your disks--the used amount includes your data and the parity for that data, and the free amount is the remaining space free among all your disks. The capacity shown for your dataset accounts for parity--the "used" amount is just your data, and the "free" amount is the free space minus what's used for parity.
What is your hardware, and what's your pool configuration (how many disks, what size, what RAIDZ configuration)?
Darren Myers
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danb35
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You don't have 37.2 TB (TiB, actually) on your volume, you have 27.2 TiB, and, as you said, 21.1 TiB for the dataset. The large majority of that difference is the one disk's worth of parity in your pool (BTW, RAIDZ1 with 6 TB drives is strongly discouraged as being unsafe for your data); the remainder is ZFS overhead. You'll see the same thing on your backup volume.
Thanks! Yes I know it is a no no to have RAIDZ1 or RAID5 with big drives. I have the other volume which is to backup the first (run a scheduled backup). I figured I would keep the same size drives together and have two separate RAID Volumes. That way, if I lost one drive I would have to lose a drive in the other volume before I would have to worry.
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