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Format /Zero out/Erase.

Posted on 2016-10-20
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Format /Zero out/Erase.

I would like to know what is the difference between these words:
Format /Zero out/Erase.

I ran into those words in Vmware whe it comes to deal with hard disks.

Any clarifications?

Thank you
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Question by:jskfan
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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 41852699
Could you provide the context ?

Zero-Out, is used in Eager Zero Provisioned disks, where the blocks in the virtual machine disk, are zero-ed out, e.g. a zero is written.

Format and Erase, are usual works, used in erasing and formatting virtual disks, but if you can provide the context in which they are used, we can clarify.
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by:jskfan
ID: 41853091
Just trying to understand the meaning of Zero out.. You stated that it means Zero is Written on the disk..
What does that do when Zero is written or Zero is not written.
I thought SAN team when they provision storage, there is no data on it, it is already formatted. So what are the written Zero used for ?
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 41853096
The phrase "zeroed out" is used, when referring to thick provision eager zeroed virtual machine disks, means that blocks on the physical storage device are formatted with zeros to overwrite any older data.

so a zero is written to the block, to replace any data which could be present.

e.g. 00 is overwritten when the block contains EA

a conventional virtual machine disk, using lazy zeroed, is NOT zero-out, so it's possible that there is old data that could be recovered in the virtual machine disk.

the process of zero-out a VMDK at creation does take longer to provision that a lazy zero-ed disk.

Eager Zeroed Out disks must be used for Clustering and Fault Tolerance.
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Author Comment

by:jskfan
ID: 41855121
Eager Zeroed Out disks must be used for Clustering and Fault Tolerance.
Do you mean :
Windows Clustering
and
Vmware Fault tolerance
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Author Comment

by:jskfan
ID: 41855123
and I wonder why ,they just do not use formatting before using the disk, and there will be no Zeroing procedures of  the disks
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LVL 124

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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 41855186
Do you mean :
Windows Clustering
and
Vmware Fault tolerance

Correct.

It's just like Windows, can do quick format, or a real format.... have you seen how long it takes to format not (quick format) a 4TB disk ? (physical).

It's about provisioning, it takes much longer.... if you do not have a reason for eager zero, MOST use lazy.
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Author Closing Comment

by:jskfan
ID: 41855630
Thank you
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LVL 124
ID: 41855667
no probs
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