Explanation of Shared Storage [newbie]

I am new to the storage and vSphere, but I did some reading and I worked my way through of vSphere well enough.

However, I'm confused about something in the vsphere-esxi-vcenter-server-51-storage-guide.pdf.

It is said

Network storage devices are shared. Data warehouses on accessible network storage devices by multiple
guests at the same time.

I'm not sure understand it.  If I understand well, SAN storage, if one of my ESXi hosts is connected to a SAN (LUN?) device, it is identical to a disk that is attached to the host phycially, i.e. host a level block on this device/disk io control.  How that benefit then?  It would not cause corruption of data to have two hosts with access at ground level to block for a given device?

chadmichael wrote:

How that benefit then?  It would not cause corruption of data to have two hosts with access at ground level to block for a given device?

For most of the file systems and operating systems, which would be true.  However, some file systems / cluster systems are equipped with this type of multiple access in mind and fight against the corruption of the type you think with clever use of interlocks, etc.

VMFS and ESXi/vSphere is one of these combinations.  VMFS is designed as a clustered file system and can manage many hosts, access to a volume.

Tags: VMware

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