Storage NFS for Exchange Server OS

While I believe that Microsoft Support policy and recommendations for Exchange servers in hardware virtualization environments, document is very clear, I was faced with the following question:

Microsoft does support the operating system Exchange server running on a NFS datastore?

I believe that this issue is the result of the lack of understanding of the support strategy.  Here is the statement in question ("BOLD" emphasis is mine):

The storage used by the Exchange Server guest machine for storage of data Exchange (for example, the basics of data from the mailbox or hub transport queues) can be virtual storage of a fixed size (for example, fixed virtual hard drives [VHD] in a Hyper-V environment), SCSI direct storage, or Internet SCSI (iSCSI) storage. Pass through storage is storage that is configured at the host level and dedicated to one guest machine. All storage used by a computer invited exchange for the storage of Exchange data must be block-level storage. Exchange 2010 is not compatible with network attached storage (NAS) volumes. NAS storage presented to the guest as block-level storage using the hypervisor is not supported. Transmission volumes must be presented as storage of block level for hardware virtualization software. This is because Exchange 2010 does not support the use of storage (NAS) devices connected to the network. The following virtual disk requirements apply to volumes that are used to store Exchange data.

While I thought that the statement applied specifically to Exchange data, you can read this includes the OS data server as well (based on the second sentence in bold).  A customer was told by an engineer from MS that NAS storage was not at all based.  I disagree, because the recommended storage configuration is to separate the BONES of exchanging data anyway.

Reference http://TechNet.Microsoft.com/en-us/library/cc794548%28EXCHG.80%29.aspx

I'm all for pick up statements of support from MS and calling him on it, when the issue is raised in question and this one is no different.  I read the Data Exchange simply means that databases, newspapers, etc.  In fact they make it that some clearly in this statement:

"The storage used by the Exchange guest machine for storage of data Exchange (for example, the basics of data from the mailbox or Hub transport queues)...". »

There is no mention of the operating system being considered as Exchange data... which is not.  As for this one:

"All storage used by a guest computer in Exchange for the storage of Exchange data must be block-level storage because Exchange 2010 does not support the use of storage (NAS) devices connected to the network."

OK, this has been an attitude of long-standing support for MS, no biggie there since we have some that only qualified Data Exchange.  To the following:

"In addition, NAS storage presented to the guest as block via the hypervisor level storage no is not supported."

The key point here is that the NAS storage can be presented to a guest in two ways, one through the prompt (mounting storage NAS for Windows, that is, \\server\share) and another through the hypervisor (supported NFS VMDK).  In this statement, they are referring to the latter.  So, after all, this hike that my point is that it seems to me that the drive for your Exchange virtual computer operating system can absolutely be hosted on NAS-based storage and be supported.

.. .then it's VMware spin on it, a little.  For Hub Transport, client access and stand-alone Mailbox servers, we have no problem with that.  We recommend, however, that if a clustering solution is deployed within the guest, i.e. DAG, you create the VMDK as eagerzeroedthick.  VMDK supported by NFS cannot be eagerzeroedthick, by our advice should not be hosted on NFS.  This little nugget of information is available here: http://kb.vmware.com/kb/1037959.  The reason behind this is when you use a disk virtual standard thickness blocks must be cancelled before the data is written, this (albeit low) latency is avoided by using the eagerzeroedthick option.  What we are proposing is avoid any additional latency that clusters tend to not like and zero all on.  BTW, we suggest this to any level of clustering, not just Exchange or MSCS comments.

-alex

Tags: VMware

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