mdamda
Enthusiast
Enthusiast

snapshot

Hi, experts i have two questions

When u take the VM snapshot what size of delta file gets created?

what is the block and file size for ESXi 6?

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rcporto
Leadership
Leadership

It depends, since it will contain only changed data... so it start small and can grow depending of how much data you change. The default block is 128 sectors or 64KB. Take a look at the following VMware KB article for additional details about snapshots: Understanding virtual machine snapshots in VMware ESXi and ESX (1015180) | VMware KB

The child disk

The child disk, which is created with a snapshot, is a sparse disk. Sparse disks employ the copy-on-write (COW) mechanism, in which the virtual disk contains no data in places, until copied there by a write. This optimization saves storage space. The grain is the unit of measure in which the sparse disk uses the copy-on-write mechanism. Each grain is a block of sectors containing virtual disk data. The default size is 128 sectors or 64 KB.

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Richardson Porto
Senior Infrastructure Specialist
LinkedIn: http://linkedin.com/in/richardsonporto
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