Some new features have recently integrated into ZFS which have change
the output of zpool(1m) command. Here's a quick recap:
1) 6574286 removing a slog doesn't work
This change added the concept of named top-level devices for the purpose
of device removal. The named top-levels are constructed by using the
logical name (mirror, raidz2, etc) and appending a unique numeric
number. After this change 'zpool status' and 'zpool import' will now
print the configuration using this new naming convention:
jaggs# zpool status tank
pool: tank
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
c0t0d0 ONLINE 0 0 0
c1t0d0 ONLINE 0 0 0
c4t0d0 ONLINE 0 0 0
c6t0d0 ONLINE 0 0 0
c7t0d0 ONLINE 0 0 0
errors: No known data errors
2) 6677093 zfs should have dedup capability
This project modified the default 'zpool list' to show the "dedupratio"
for each pool. Subsequently a new property, "dedupratio", is available
when using 'zpool get':
jaggs# zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
export 928G 47.5G 881G 5% 1.77x ONLINE -
rpool 928G 25.7G 902G 2% 1.40x ONLINE -
jaggs# zpool get dedup rpool
NAME PROPERTY VALUE SOURCE
rpool dedupratio 1.40x -
3) 6897693 deduplication can only go so far
The integration of dedup changed the way we report report "used" and
"available" space in a pool. In particular, 'zpool list' reports
"allocated" and "free" physical blocks opposed to 'zfs list' shows
"used" and "available" space to the filesystem. This change replaced the
the "used" property with "allocated" and "available" with "free". This
should help clarify the accounting difference reported by the two
utilities. This does, however, impact any scripts which utilized the old
"used" and "available" properties of the zpool command. Those scripts
should be updated to use the new naming convention:
jaggs# zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
rpool 464G 64.6G 399G 13% 1.00x ONLINE -
tank 2.27T 207K 2.27T 0% 1.00x ONLINE -
jaggs# zpool get allocated,free rpool
NAME PROPERTY VALUE SOURCE
rpool allocated 64.6G -
rpool free 399G -
We realize that these changes may impact some user scripts and we
apologize for any inconvenience this may cause.
Thanks,
George
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