Continuing from the
previous post...
This might be another pointless experiment (the
conclusion below is worth reading though), since I’ve seen it written:
“Before you
initiate the cutover, you should disable client access to the LUNs, shares, and
NFS volumes to avoid potential data loss or corruption that might otherwise
occur, as the cutover is a disruptive process. This has to be done at the
client because 7MTT requires that all protocol services be running on the
controllers so it can gather data.”
Still there’s nothing wrong with a little curiosity.
The Scenario
This time we’re using 7MTT CFT to transition 7-Mode
controllers - fas01 and fas02 - to Clustered Data ONTAP.
Here are our shares and exports on fas01:
fas01>
cifs shares
Name Mount Point
---- -----------
ETC$ /etc
HOME /vol/vol0/home
C$ /
vol1 /vol/vol1
vol2 /vol/vol2
folder1 /vol/vol1/folder1
folder2 /vol/vol2/folder2
fas01>
exportfs
/vol/vol0/home -sec=sys,rw,nosuid
/vol/vol0 -sec=sys,rw,anon=0,nosuid
/vol/vol1 -sec=sys,rw,root=192.168.0.61,nosuid
/vol/vol2 -sec=sys,rw=20.20.20.20,root=20.20.20.20,nosuid
/vol/san_vol1 -sec=sys,rw,nosuid
/vol/san_vol2 -sec=sys,rw,nosuid
Here are our shares and exports on fas02:
fas02>
cifs shares
Name Mount Point
---- -----------
ETC$ /etc
HOME /vol/vol0/home
C$ /
vol3 /vol/vol3
vol4 /vol/vol4
fas02>
exportfs
/vol/vol0/home -sec=sys,rw,nosuid
/vol/vol0 -sec=sys,rw,anon=0,nosuid
/vol/vol3 -sec=sys,rw=30.30.30.30,root=30.30.30.30
/vol/vol4 -sec=sys,rw=40.40.40.40,root=40.40.40.40
/vol/san_vol3 -sec=sys,rw,nosuid
/vol/san_vol4 -sec=sys,rw,nosuid
We run the 7MTT CFT workflow as far as the ‘Export & Halt’.
Image: 7MTT CFT
ready to click ‘Export & Halt’
Then we terminate CIFS and NFS on fas01 and fs02.
cifs
terminate
nfs
off
Image: Terminating
CIFS and NFS before 7MTT CFT ‘Export & Halt’
Export & Halt is successful!
Image: 7MTT CFT
Export & Halt is green!
We verify our cabling.
Image: 7MTT CFT
cabling verified!
And now to import!
And the import is Successful.
Image: Successful
import steps 11 - 17 (notice there is an ‘Applying NFS configurations’ but no ‘Applying
CIFS configurations’)
Image: 7MTT CFT
import steps 1 to 10.
The Result
The result is slightly unexpected.
As expected, none of the CIFS shares got transitioned due
to our “CIFS terminate”.
Unexpectedly, the NFS exports came across.
cluster1::>
cifs share show -fields share-name,path
vserver share-name path
---------
---------- ----
svm_fas01
admin$ /
svm_fas01
c$ /
svm_fas01
ipc$ /
svm_fas01
testvol1 /testvol1
svm_fas02
admin$ /
svm_fas02
c$ /
svm_fas02
ipc$ /
svm_fas02
testvol2 /testvol2
8
entries were displayed.
cluster1::>
export-policy rule show -fields clientmatch
vserver policyname ruleindex clientmatch
---------
-------------------------- --------- ------------
svm_fas01
transition_export_policy_1 1
192.168.0.61
svm_fas01
transition_export_policy_1 2
0.0.0.0/0
svm_fas01
transition_export_policy_2 1
0.0.0.0/0
svm_fas01
transition_export_policy_3 1
20.20.20.20
svm_fas01
transition_export_policy_4 1
0.0.0.0/0
svm_fas01
transition_readonly 1 0.0.0.0/0
svm_fas02
transition_export_policy_1 1
30.30.30.30
svm_fas02
transition_export_policy_2 1 0.0.0.0/0
svm_fas02
transition_export_policy_3 1
40.40.40.40
svm_fas02
transition_export_policy_4 1
0.0.0.0/0
svm_fas02
transition_readonly 1 0.0.0.0/0
cluster1::>
volume show -fields policy -policy transition*
vserver volume
policy
---------
-------- --------------------------
svm_fas01
san_vol1 transition_export_policy_2
svm_fas01
san_vol2 transition_export_policy_2
svm_fas01
svm_fas01_root transition_readonly
svm_fas01
vol0 transition_export_policy_4
svm_fas01
vol1 transition_export_policy_1
svm_fas01
vol2 transition_export_policy_3
svm_fas02
san_vol3 transition_export_policy_2
svm_fas02
san_vol4 transition_export_policy_2
svm_fas02
svm_fas02_root transition_readonly
svm_fas02
vol0 transition_export_policy_4
svm_fas02
vol3 transition_export_policy_1
svm_fas02
vol4 transition_export_policy_3
This makes me think, what if we’d done ‘cifs terminate -v’ on all the volumes
being transitioned, instead of cifs terminate?
CIFS Terminate
-v
I repeated the test, this time doing a ‘cifs terminate -v VOLNAME’ for every
data volume with CIFS shares being transitioned.
Image: Running ‘cifs
terminate -v VOLNAME’ before 7MTT CFT Export & Halt
And after completing the transition (completing the
Import), we see our shares are transitioned!
Image: 7MTT CFT transition
completed with shares transitioned!
Conclusion
Prior to performing a 7MTT CFT cutover, in order to
terminate NFS and CIFS access - to ensure NAS client access is terminated - we
can do an ‘nfs off’ and ‘cifs terminate -v VOLNAME’ (on every
volume with CIFS shares being transitioned.)
CAVEAT LECTOR: Don’t
take my word for it though, confirm with the relevant authorities.
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