IHAC who are using FAS3020 running ONTAP 7.2.5.1.They enabled dedupe on a volume of 30GBwhich is not space reserved and the fractional reserve is set to 100%.The volume has a LUN of 25GB.
After enabling dedupe,customer saw the volume size increasing and it reached to a max autogrow limit of 60GB.Customer then disabled dedupe.(I believe they did using sis stop/sis off commands which saves the current fingerprint information) as the aggregate was also running out of space.
BEFORE dedupe AFTER dedupe
Vol->30GB vol-->60GB
lun->25GB lun->25GB
## vol options ##
SCCM online raid_dp, flex nosnap=off, nosnapdir=off,
sis minra=off, no_atime_update=off,
nvfail=off,
ignore_inconsistent=off,
snapmirrored=off,
create_ucode=on,
convert_ucode=on,
maxdirsize=20971,
schedsnapname=ordinal,
fs_size_fixed=off,
guarantee=none, svo_enable=off,
svo_checksum=off,
svo_allow_rman=off,
svo_reject_errors=off,
no_i2p=off,
fractional_reserve=100,
extent=off,
try_first=volume_grow,
sis_logging=off,
read_realloc=off
Containing aggregate: 'aggr0'
#sis status -l shows the volume as :
Path: /vol/SCCM
State: Disabled
Status: Idle
Progress: Idle for 30:11:29
Type: Regular
Schedule: auto
Last Operation Begin: Wed Jun 24 12:08:00 IST 2009
Last Operation End: Wed Jun 24 12:23:00 IST 2009
Last Operation Size: 25 GB
Last Operation Error: -
Stage: Done
Fingerprints Gathered: 6554516
Gathering Begin: Wed Jun 24 12:08:00 IST 2009
Fingerprints Sorted: 6554516
Duplicate Blocks Found: 784739
Sorting Begin: Wed Jun 24 12:17:39 IST 2009
Blocks De-duplicated: 784876
De-duping Begin: Wed Jun 24 12:18:16 IST 2009
Fingerprints Deleted: 0
Checking Begin: -
How can we reclaim the grown space in the volume?Is it because of the fingerprint information & checkpoints?can we delete the fingerprints and start a fresh dedupe using "sis start -s"
OR
Do a deletion of fingerprints and "sis undo" the volume first before starting it all over.
Any inputs will be highly appreciated.
best regards
sarbjit