iSCSI LUN 350Gb more used space 600Gb !

Question

Hello,I created a 350GB iSCSI volume on my ReadyNAS firmware 6.2.4.But I see the space used is actually 600Gb.Is this normal?

mdgm-ntgr · Answer

Are you using snapshot protection?What is the LUN being used for?

cerede2000 · Answer

What's snapshot protection ?&nbsp;My LUN is connected to Windows 2008 R2 for disk volume.

StephenB · Answer

cerede2000 wrote:
What's snapshot protection ?
&nbsp;

Read chapter 5 of the manual (http://www.downloads.netgear.com/files/GDC/READYNAS-100/readynas6.2_11March2015.pdf)

cerede2000 · Answer

Thanks :)&nbsp;No, snapshots is not used.

kohdee · Answer

This could happen if you have fragmentation on your LUN.
For instance, you can have an unlimited number of extents on a file. Theoretically, a million extents could equal maybe a terabyte of fragmentation.&nbsp;
&nbsp;
What kind of LUN are you using -- thick or thin?
Thin LUNs inheritently will fragment because it is a file that builds on to an existing&nbsp;file. A Thick LUN preallocated all the data and then adds to existing extent trees. &nbsp;

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iSCSI LUN 350Gb more used space 600Gb !

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