How do I set disk reservation on a dataset in solaris zfs?

petulia3478

# zfs set reservation=

# zfs set reservation=1GB test_pool/fs1/data

Check:

# zfs get reservation test_pool/fs1/data
NAME                PROPERTY     VALUE               SOURCE
test_pool/fs1/data  reservation  1G                  local

A ZFS reservation represents an allocation of space from the pool that is guaranteed to be available to a dataset. The space must be available in the pool for you to be able to reserve it for a dataset.

NOTE: reservations are not cumulative. If you have set a reservation to 5GB and then set it again to 2GB, it will set the reservation to 2GB not 7GB).

You will see a difference in the output of "zfs list" when reservations are set:

Before reservation:

# zfs list
test_pool                       262K  1.95G    21K  /test_pool
test_pool/export                 18K  1.95G    18K  /export/zfs
test_pool/fs1                    57K  1.95G    21K  /test_pool/fs1
test_pool/fs1/admin              18K  1.95G    18K  /test_pool/fs1/admin
test_pool/fs1/data               18K  1.95G    18K  /test_pool/fs1/data
test_pool/fs2                    18K  1.95G    18K  /test_pool/fs2

After reservation:

# zfs list
test_pool                      1.00G   976M    21K  /test_pool
test_pool/export                 18K   976M    18K  /export/zfs
test_pool/fs1                  1.00G   976M    21K  /test_pool/fs1
test_pool/fs1/admin              18K   976M    18K  /test_pool/fs1/admin
test_pool/fs1/data               18K  1.95G    18K  /test_pool/fs1/data
test_pool/fs2                    18K   976M    18K  /test_pool/fs2