VMFS-3 extensions are contiguous?

VMFS-3 extensions are contiguous?  Here's the story: we use a Fibre Channel SAN network and will present a 2 TB LUNS, which is spread over several physical disks. This will be our first 'pool' space VMFS.

Here's the question: vmware treats "extensions" as a contiguous file space? Or the extended volume seeks to balance the loads on the primary and additional scopes?

You can see the problem: if I struck out the LUN I introduce vmware and vmware tries stripe scope (which is already deleted material), it would be bad for the performance.

My apologies if this has been discussed... I did some ruffling the archives and didn't find out anything concrete.

Thank you!!

Hello and welcome to the forums.

VMFS-3 extensions are contiguous?  Here's the story: we use a Fibre Channel SAN network and will present a 2 TB LUNS, which is spread over several physical disks. This will be our first 'pool' space VMFS.

Here's the question: vmware treats "extensions" as a contiguous file space? Or the extended volume seeks to balance the loads on the primary and additional scopes?

"... you can add additional capacity by adding a new measure to the VMFS volume. This will add the additional LUN to an existing VMFS volume. However, until the initial capacity is filled with this additional allocation of capacity is not yet put to use. Note that the VMFS does not distribute on LUNs when more than one logical unit number is assigned to a given VMFS volume. "p. 15 VMware Virtual Machine File System: technical overview and best practices

You can see the problem: if I struck out the LUN I introduce vmware and vmware tries stripe scope (which is already deleted material), it would be bad for the performance.

"Additional capacity with disk spanning does not necessarily add additional I/O for this VMFS volume flow capabilities. Increased storage capacity does not, however, lead. If properly deployed on the underlying storage array, the additional capacity may be affected on batteries other than the first logic unit number and will result in additional throughput capacity as well. It is best to make sure that you add when ONE of similar performance (RAID and I/O density level) addition of a VMFS volume capacity existing. "p. 16 VMware Virtual Machine File System: technical overview and best practices

All that being said, it is recommended to avoid the use of extensions if and when possible.

Good luck!

Tags: VMware

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