We are working on a project that is housed in two separate buildings for disaster recovery.
In each building we have a Windows server, a FAS270 filer and a FC SAN switch.
The switches are not directly connected to each other, but we have long fibre runs so that each Windows server is connected to both switches. Each filer is connected to just its local FC switch. (This is a limitation of the FAS270, which has only one FC SAN port.)
One filer is primary and the other is backup. On the primary filer I have a large volume containing a large LUN and this volume is being snapmirrored (synchronous) to the backup filer over ethernet.
Both Windows servers can "see" both LUNs. We are using Windows clustering so that if the primary Windows server fails, the backup server will take over, using the primary LUN. If the primary netapp (or switch) fails, then we will need to manually intervene to cut over to the backup filer and LUN.
So here is my question (at last). Is it possible to access both the primary LUN and the read only backup LUN on a Windows server? Windows seems to be confused by the read only LUN and I am seeing errors on the backup filer saying that Windows is trying to write to the LUN. I'm not a Windows guy, but is there any way to look at the files on the read only LUN from Windows?
This isn't necessary for normal operations, I'm just curious.
Steve Losen scl@virginia.edu phone: 434-924-0640
University of Virginia ITC Unix Support
You can't mount the RO LUN directly from Windows, but you can clone the volume and then mount the LUN from the cloned volume. Alternatively you can break the SM relationship, thus making the dest vol r/w, but FlexClone is a pretty elegant solution here.
-- Adam Fox adamfox@netapp.com
-----Original Message----- From: Stephen C. Losen [mailto:scl@sasha.acc.virginia.edu] Sent: Friday, July 27, 2007 9:09 AM To: toasters@mathworks.com Subject: Accessing snapmirrored (read only) LUN from Windows?
We are working on a project that is housed in two separate buildings for disaster recovery.
In each building we have a Windows server, a FAS270 filer and a FC SAN switch.
The switches are not directly connected to each other, but we have long fibre runs so that each Windows server is connected to both switches. Each filer is connected to just its local FC switch. (This is a limitation of the FAS270, which has only one FC SAN port.)
One filer is primary and the other is backup. On the primary filer I have a large volume containing a large LUN and this volume is being snapmirrored (synchronous) to the backup filer over ethernet.
Both Windows servers can "see" both LUNs. We are using Windows clustering so that if the primary Windows server fails, the backup server will take over, using the primary LUN. If the primary netapp (or switch) fails, then we will need to manually intervene to cut over to the backup filer and LUN.
So here is my question (at last). Is it possible to access both the primary LUN and the read only backup LUN on a Windows server? Windows seems to be confused by the read only LUN and I am seeing errors on the backup filer saying that Windows is trying to write to the LUN. I'm not a Windows guy, but is there any way to look at the files on the read only LUN from Windows?
This isn't necessary for normal operations, I'm just curious.
Steve Losen scl@virginia.edu phone: 434-924-0640
University of Virginia ITC Unix Support
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Fox, Adam -
Stephen C. Losen