I took
exception to something in Justin Parisi’s blog post:
In it he
wrote -
“...If you are running ONTAP 9.4, XDP
SnapMirror will work across
all prior ONTAP 9.x releases except for ONTAP 9.2...”
That tripped
my fake news detector. If you think about it, it makes zero sense that 9.4 to
9.1 works, but 9.4 to 9.2 doesn’t, and then 9.4 to 9.3 does - XDP SnapMirror is such an awesome and powerful technology, why would it just decide to stop working for 9.2!?
Image: The exception I took exception to
This is
what he should have written:
“...If you are running ONTAP 9.4, XDP
SnapMirror will be supported
across all prior ONTAP 9.x releases except for ONTAP 9.2...”
In the
screenshots below is proof of sorts to show it does indeed work for 9.2 to 9.4
and vice versa.
Image: XDP SnapMirror from 9.2 to 9.4 works
(just not supported)
Image: XDP SnapMirror from 9.4 to 9.2 works
(just not supported)
In the official table below, I think the language is wrong; instead of “Will
work with these previous releases” it should be “is guaranteed to work and
supported with these previous releases”. Pernickety me?
Image: SnapMirror XDP Release Interoperability
APPENDIX: CLI
In case my proof images go missing, I have put
the CLI output below:
clu1::> version
NetApp Release 9.2P4: Tue
May 01 19:23:51 UTC 2018
clu1::> snapmirror show
Progress
Source Destination Mirror Relationship
Total Last
Path Type
Path State Status Progress Healthy Updated
----------- ----
------------ ------- -------------- --------- ------- --------
clu2v1:vol2 XDP clu1v1:vol2_DR Snapmirrored Idle -
true -
clu1::> snapmirror
list-destinations
Progress
Source Destination Transfer Last
Relationship
Path Type
Path Status Progress Updated
Id
----------- -----
------------ ------- --------- ------------ ---------------
clu1v1:vol1 XDP clu2v1:vol1_DR Idle -
-
678c478c-b9f2-11e8-ba81-000c299131c0
clu1::> qtree show -qtree
!""
Vserver Volume Qtree Style Oplocks Status
---------- -------------
------------ ------------ --------- --------
clu1v1 vol1
qtree1 unix enable normal
clu1v1 vol2_DR qtree2 unix enable readonly
2 entries were displayed.
clu2::> version
NetApp Release 9.4: Fri Jun
08 22:50:12 UTC 2018
clu2::> snapmirror show
Progress
Source Destination Mirror Relationship
Total Last
Path Type
Path State Status Progress Healthy Updated
----------- ----
------------ ------- -------------- --------- ------- --------
clu1v1:vol1 XDP clu2v1:vol1_DR Snapmirrored Idle -
true -
clu2::> snapmirror list-destinations
Progress
Source Destination Transfer Last
Relationship
Path Type
Path Status Progress Updated
Id
----------- -----
------------ ------- --------- ------------ ---------------
clu2v1:vol2 XDP clu1v1:vol2_DR Idle -
-
3ea380b6-b9f3-11e8-b19e-000c293eecae
clu2::> qtree show -qtree
!""
Vserver Volume Qtree Style Oplocks Status
---------- -------------
------------ ------------ --------- --------
clu2v1 vol1_DR qtree1 unix enable readonly
clu2v1 vol2 qtree2 unix enable normal
2 entries were displayed.
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