Instantaneous release of storage volume need?

Hello!

It was recently explained to me that a shared storage volume (for example, iSCSI, FC) must have a certain amount of free space (space drive or vacuum), so that snapshots of comments can take without any problems. I was told that this margin was 1/3 of the useful capacity of the storage volume for volume with 10 TB usable disk space, we must treat it as being actually 6.6 TB. This seems odd to me that we should ignore purely and simply 3.4 TB of usable disk space - I think that overhead costs, if any, would depend on the size of the virtual disk of customers located in the storage volume.

It's really confusing to me. Can someone knowledgeable please shed some light on this subject?

Hello

He may have told you that the threshold of free space of 10 to 20% on the data store. This means that 10 TB, you will keep about 1 TB for the threshold of free space and 1 TB for the growth of the snapshot (unless the virtual machine is a few DB or SQl VMs). So there should be at least 2 TB of free space on the data store before take you the snapshot.

Thank you

Tags: VMware

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