HA and DRS with Direct mapped LUN.

[Ravi1987]

i have a virtual machine and directly mapped with one 500 GB iscsi LUN.

Can any body tell me if HA and DRS will be possible or not. As i know HA and DRS is possible in RDM.

[AntonVZhbankov · Accepted solution]

>i have a virtual machine and directly mapped with one 500 GB iscsi LUN.

I suppose you mean that LUN is connected via software iSCSI initiation from guest OS.

Yes, HA and DRS are absolutely compatible with this scenario.

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MCITP: SA+VA, VCP 3/4, VMware vExpert

http://blog.vadmin.ru

[PduPreez]

It should be possible but I have not tested it yet

Make sure your SAN is setup with WWN Zoning and not Port Zoning

This will allow the SAN to auto-update when the VMs WWN is seen through the new ports used by new host.

HA will definitely work if this is true

I'm just thinking the slight delay might let VMotion fail

Very Interesting question, I wanna check it out myself

Regards

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[Ravi1987]

Thanks for you reply.

That means HA /DRS will work without issue if i directly map a 500 gb lun to virtual machine.

Please tell me one more thing if i lun is mapped with 1 physical server by iscsi and i disconnect that lun from pysical machine and mapp it to one virtula machine by RDM. in that case data will be safe or currpted.

[AntonVZhbankov]

>Make sure your SAN is setup with WWN Zoning and not Port Zoning

This is iSCSI LUN, so WWNs and zoning are no applicable

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MCITP: SA+VA, VCP 3/4, VMware vExpert

http://blog.vadmin.ru

[AntonVZhbankov]

>Please tell me one more thing if i lun is mapped with 1 physical server by iscsi and i disconnect that lun from pysical machine and mapp it to one virtula machine by RDM. in that case data will be safe or currpted.

It does not matter how you connect it, via RDM or from guest OS. It all depends on filesystem on this LUN. If there is NTFS or ext3 then the only requirement - only ONE machine can use it at any period of time. If you have cluster filesystem like OCFS2 or GFS then you can acess this LUN from many machines simultaneously.

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MCITP: SA+VA, VCP 3/4, VMware vExpert

http://blog.vadmin.ru

[Ravi1987]

thanks for all of your answers.

One more question does FT work with direct or rdm mapped lun/disk.

[AntonVZhbankov]

"Ensure that the datastore is not using physical RDM (Raw Disk Mapping). Virtual RDM is supported."

Here is detailed info: http://communities.vmware.com/blogs/vmroyale/2009/05/18/vmware-fault-tolerance-requirements-and-limi...

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MCITP: SA+VA, VCP 3/4, VMware vExpert

http://blog.vadmin.ru

[PduPreez]

😮 I misread the whole question.
Sorry for the futile response, I'll go see the optometrist 😄

Happy Virtualizing :smileycool: