Hello!
Is there any article on the net that would clearly describe how to find out how much space is actually occupied by various objects in ZFS, such as FS, ZVOL and how to find out the actual available space taking into account quotas?
From other posts I understand that in my case at least 25% is lost in overhead expenses (ashift=12 (so 4K "sectors") and volblocksize=16K) not counting parity data.
There are snapshots skipped everywhere, the total number of snapshots is close to a thousand.
One gets the impression that there is some kind of reservation involved here.
Is there any article on the net that would clearly describe how to find out how much space is actually occupied by various objects in ZFS, such as FS, ZVOL and how to find out the actual available space taking into account quotas?
From other posts I understand that in my case at least 25% is lost in overhead expenses (ashift=12 (so 4K "sectors") and volblocksize=16K) not counting parity data.
There are snapshots skipped everywhere, the total number of snapshots is close to a thousand.
One gets the impression that there is some kind of reservation involved here.
Code:
# zpool list -v
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
some-zfs-pool 43.6T 3.67T 40.0T - - 10% 8% 2.00x ONLINE -
raidz2-0 14.5T 1.19T 13.4T - - 10% 8.19% - ONLINE
sdi 1.82T - - - - - - - ONLINE
...
raidz2-1 14.5T 1.24T 13.3T - - 10% 8.52% - ONLINE
sdq 1.82T - - - - - - - ONLINE
...
raidz2-2 14.5T 1.23T 13.3T - - 10% 8.47% - ONLINE
sdy 1.82T - - - - - - - ONLINE
...
logs - - - - - - - - -
nvme0n1 238G 468M 238G - - 0% 0.19% - ONLINE
cache - - - - - - - - -
nvme1n1 233G 53.6G 179G - - 0% 23.0% - ONLINE
Code:
# zfs list -o space |grep -E 'storage|NAME'
NAME AVAIL USED USEDSNAP USEDDS USEDREFRESERV USEDCHILD
some-zfs-pool/vm-storage 1.40T 4.60T 0B 205K 0B 4.60T
some-zfs-pool/vm-storage/base-100-disk-0 1.43T 58.7G 5.17G 18.8G 34.6G 0B
some-zfs-pool/vm-storage/base-104-disk-0 1.43T 39.5G 1.05G 3.80G 34.6G 0B
some-zfs-pool/vm-storage/vm-101-disk-0 1.76T 964G 249G 347G 368G 0B
some-zfs-pool/vm-storage/vm-102-disk-0 1.43T 64.1G 23.6G 8.30G 32.2G 0B
some-zfs-pool/vm-storage/vm-103-disk-0 1.60T 757G 344G 200G 212G 0B
some-zfs-pool/vm-storage/vm-105-disk-0 1.50T 123G 1.50G 11.5G 110G 0B
some-zfs-pool/vm-storage/vm-106-disk-0 1.71T 606G 13.4G 268G 325G 0B
some-zfs-pool/vm-storage/vm-106-disk-1 1.71T 332G 85.9M 7.29G 325G 0B
some-zfs-pool/vm-storage/vm-107-disk-0 1.44T 47.8G 476M 4.04G 43.3G 0B
some-zfs-pool/vm-storage/vm-108-disk-0 1.44T 47.1G 16.4M 3.81G 43.3G 0B
some-zfs-pool/vm-storage/vm-109-disk-0 1.44T 47.1G 19.6M 3.81G 43.3G 0B
some-zfs-pool/vm-storage/vm-110-disk-0 1.43T 38.5G 19.3M 3.81G 34.6G 0B
some-zfs-pool/vm-storage/vm-111-disk-0 1.44T 47.1G 20.1M 3.81G 43.3G 0B
some-zfs-pool/vm-storage/vm-112-disk-0 1.44T 47.1G 17.1M 3.80G 43.3G 0B
some-zfs-pool/vm-storage/vm-113-disk-0 1.60T 380G 16.1G 160G 204G 0B
some-zfs-pool/vm-storage/vm-113-disk-1 1.64T 498G 34.3G 217G 247G 0B
some-zfs-pool/vm-storage/vm-114-disk-0 1.52T 130G 0B 119K 130G 0B
some-zfs-pool/vm-storage/vm-114-disk-1 1.52T 259G 15.0G 114G 130G 0B
some-zfs-pool/vm-storage/vm-114-disk-2 1.51T 190G 1.85G 74.3G 114G 0B
some-zfs-pool/vm-storage/vm-115-disk-0 1.43T 38.5G 31.8M 3.80G 34.6G 0B
Code:
# zpool get ashift
NAME PROPERTY VALUE SOURCE
some-zfs-pool ashift 12 local
Code:
# zfs get volblocksize |grep -v autosnap |grep -E 'storage|NAME'
NAME PROPERTY VALUE SOURCE
some-zfs-pool/vm-storage volblocksize - -
some-zfs-pool/vm-storage/base-100-disk-0 volblocksize 16K -
some-zfs-pool/vm-storage/base-100-disk-0@__base__ volblocksize - -
some-zfs-pool/vm-storage/base-104-disk-0 volblocksize 16K -
some-zfs-pool/vm-storage/base-104-disk-0@__base__ volblocksize - -
some-zfs-pool/vm-storage/vm-101-disk-0 volblocksize 16K -
...
some-zfs-pool/vm-storage/vm-115-disk-0 volblocksize 16K -
Code:
# zfs get quota |grep -v 'quota - -' |grep -E 'storage|NAME'
NAME PROPERTY VALUE SOURCE
some-zfs-pool/vm-storage quota 6T local
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