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using admsnap on vsphere virtual machines to flush buffers?
We currently run a SQL server host on our vsphere server, which has a LUN connected via a raw device mapping. We would like to snapshot this LUN, but as it is running SQL we need to flush the buffers using the 'admsnap -flush -o e' command, however this returns the error:-
Error looking up object "e".
Error: 0x3E160042 (The volume type is not supported on this operating system).
When i run the command 'admsnap list' i get the error:-
There were no devices found whose LUN WWN could be listed.
Is it possible to run the admsnap command from a host on an vsphere server to flush the buffers for a raw device mapping, or should something be installed onto the vsphere ESX server to to flush the LUN?
dynamox
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March 9th, 2010 18:00
is this LUN in physical RDM mode ?
Tr1gger1
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March 10th, 2010 00:00
It looks as though the RDM have been added as Virtual, is this my problem?
Tr1gger1
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March 10th, 2010 05:00
dynamox, that was indeed the problem, we had the RDM's set as Virtual rather than Physical.
Thanks
dynamox
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March 10th, 2010 06:00
that's what i was suspecting. How did you remedy this, did you provision another RDM LUN in physical mode and migrate the data ?
Tr1gger1
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March 10th, 2010 06:00
We're just testing at the moment, so i just gave it another RDM and connected it as a physical and it worked fine. We currently need to understand the best way for us to clone/snapshot, will it be SAN level or use VMWare, not too sure yet? But i now know the limitations of allocating RDM's as physical or virtual.
We're pretty new to this VMWare/EMC clone/snapshots so just trying to find our feet at the moment, and the training courses just give us a high level undestanding so expect a lot more questions on here! :-)
Thanks again!
dynamox
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March 11th, 2010 13:00
take a look at this paper, i think you will find it beneficial as it mentions nuances when working with VMs and Clariion layered application.
EMC Clariion Integration with VMware ESX Server
https://powerlink.emc.com/nsepn/webapps/btg548664833igtcuup4826/km/live1/en_US/Offering_Technical/White_Paper/H1416-emc-clariion-intgtn-vmware-wp.pdf